231 results on '"Samuolienė, Giedrė"'
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52. Pre-harvest LED lighting strategies for reduced nitrate contents in leafy vegetables
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Viršilė, Akvilė, primary, Brazaitytė, Aušra, additional, Jankauskienė, Julė, additional, Miliauskienė, Jurga, additional, Vaštakaitė, Viktorija, additional, Odminytė, Ingrida, additional, Novičkovas, Algirdas, additional, and Samuolienė, Giedrė, additional
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- 2018
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53. Quality and developmental changes in white head cabbage (Brassica oleracea L.) and radish (Raphanus sativus L.) during winter storage
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Viškelienė, Alina, primary, Samuolienė, Giedrė, additional, Karklelienė, Rasa, additional, Viškelis, Pranas, additional, Sasnauskas, Audrius, additional, and Duchovskis, Pavelas, additional
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- 2017
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54. Pulsed Light-Emitting Diodes for a Higher Phytochemical Level in Microgreens
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Vaštakaitė, Viktorija, primary, Viršilė, Akvilė, additional, Brazaitytė, Aušra, additional, Samuolienė, Giedrė, additional, Jankauskienė, Julė, additional, Novičkovas, Algirdas, additional, and Duchovskis, Pavelas, additional
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- 2017
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55. Rootstock vigour and leaf colour affect apple tree nutrition
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Kviklys, Darius, primary, Lanauskas, Juozas, additional, Uselis, Nobertas, additional, Viškelis, Jonas, additional, Viškelienė, Alina, additional, Buskienė, Loreta, additional, Staugaitis, Gediminas, additional, Mažeika, Romas, additional, and Samuolienė, Giedrė, additional
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- 2017
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56. Relationships between apple tree rootstock, crop-load, plant nutritional status and yield
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Samuolienė, Giedrė, primary, Viškelienė, Alina, additional, Sirtautas, Ramūnas, additional, and Kviklys, Darius, additional
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- 2016
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57. The effect of rootstock on apple tree bearing stability in a cooler climate
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Kviklys, Darius, primary, Čeidaitė, Alina, additional, Lanauskas, Juozas, additional, Uselis, Nobertas, additional, and Samuolienė, Giedrė, additional
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- 2016
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58. THE EFFECT OF UV-A SUPPLEMENTAL LIGHTING ON ANTIOXIDANT PROPERTIES OF OCIMUM BASILICUM L. MICROGREENS IN GREENHOUSE
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VAŠTAKAITĖ, Viktorija, primary, VIRŠILĖ, Akvilė, additional, BRAZAITYTĖ,, Aušra, additional, SAMUOLIENĖ, Giedrė, additional, JANKAUSKIENĖ, Julė, additional, SIRTAUTAS, Ramūnas, additional, and DUCHOVSKIS, Pavelas, additional
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- 2015
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59. Interaction Between Flowering Initiation and Photosynthesis
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Samuolienė, Giedrė
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Science / Earth Sciences / Meteorology & Climatology - Abstract
Interaction Between Flowering Initiation and Photosynthesis
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- 2012
60. Alternations in phytohormone system in apple rootstocks under water stress
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Sakalauskaitė, Jurga, Šikšnianienė, Jūratė Bronė, Kviklys, Darius, Urbonavičiūtė, Akvilė, Samuolienė, Giedrė, Šabajevienė, Gintarė, Lanauskas, Juozas, and Duchovskis, Pavelas
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Crops--Effect of drought on ,Žemės ūkio kultūros--Sausros poveikis ,Apples ,Grafting ,Augalų hormonai ,Plant hormones ,Obelys ,Skiepijimas (augalininkystė) - Abstract
2005 m. Lietuvos sodininkystės ir daržininkystės instituto vegetacinėje aikštelėje atliktų tyrimų tikslas – įvertinti skirtingo intensyvumo sausros poveikio efektą įvairių obelų poskiepių fitohormonų sistemai. Tirta 10 obelų poskiepių: sėklinis, MM.106, M.26, B.118, M.9, P 60, P 59, P 2, B.396, P 22. Tyrimo metu palaikyti skirtingi dirvos drėgmės režimai: kontrolė (20–30 kPa), 40–50 kPa ir > 70 kPa. Fitohormonų (giberelo rūgšties, zeatino, indolil-3-acto rūgšties ir abscizo rūgšties) analizės atliktos efektyviosios skysčių chromatografijos metodu. Dėsningų fitohormonų kitimo tendencijų įvairių obels poskiepių lapuose, intensyvėjant sausros stresui, nenustatyta. Didesni sausros streso fitohormono – abscizo rūgšties kiekiai, intensyvėjant sausros stresui, nustatyti šių poskiepių lapuose: M.26, B.118, P 59, B.396 ir P 2. Kitų poskiepių lapuose, intensyvėjant sausros stresui, abscizo rūgšties kiekis tendencingai mažėjo arba priklausė nuo sausros streso intensyvumo. Intensyvėjant sausros stresui, zeatino kiekis daugumos poskiepių (sėklinis, MM.106, P 60, P 59, B.396, P 22) lapuose sumažėjo, kituose – padidėjo. Giberelo rūgšties ir indolil-3-acto rūgšties sintezė skirtingų poskiepių lapuose kito įvairiai ir nepriklausė nuo sausros streso intensyvumo. The object of this study was to evaluate the effect of different water regime on phytohormone system in apple rootstock leaves. The trial was performed at the Lithuanian Institute of Horticulture in 2005. Trial was conducted with 10 rootstocks: Antonowka seedling, MM.106, M.26, B.118, M.9, P 60, P 59, P 2, B.396, and P 22. Plants were e x posed to three soil moisture regimes: control (20–30 kPa), 40–50 kPa and > 70 kPa. Phytohormones (gibberellic acid, zeatin, indolyl-3- acetic acid and abscisic acid) content analysis was performed using chromatographic method. There was determined no regular alternation of phytohormone in rootstock leaves under increasing drought stress. Abscisic acid synthesis, as drought stress phytohormone, increased under intensifying drought stress in the leaves of these rootstocks: M.26, B.118, P 59, B.396 ir P 2. Other rootstocks accumulated less abscisic acid under increasing drought stress or were depended on water stress intensity. The supply of zeatin decreased under intensifying drought stress in the most rootstock (seedling, MM.106, P 60, P 59, B.396, P 22) leaves. Inverse ratio was determined in remaining rootstocks, where intensifying water stress induced synthesis of zeatin. Synthesis of gibberellic acid and indolyl-3-acetic acid varied in various rootstocks subjected to water stress intensity.
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- 2007
61. Angliavandenių sezoninių pokyčių tyrimas 'Auksis' veislės obelyse su skirtingais poskiepiais
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Šabajevienė, Gintarė, Kviklys, Darius, Samuolienė, Giedrė, Sasnauskas, Audrius, and Duchovskis, Pavelas
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Apples ,Grafting ,Obelys ,Carbohydrates ,Angliavandeniai ,Skiepijimas (augalininkystė) - Abstract
This study examined the effect of rootstock genotype on seasonal variation of non-structural carbohydrate (fructose, glucose, maltose) concentrations in apple tree shoot bark. Experiment was carried out at the Lithuanian Institute of Horticulture in 2005–2007. Investigations included cv. ‘Auksis’ on B series (B.9, B.146, B.396,), P series (P 2, P 22, P 60) and M series (M.9, M.26) rootstocks. All groups of rootstocks are under research, followed the tendency of more intensive accumulation of monosaccharides in the orchards with more vigorous rootstocks in summer. By the way, accumulation of maltose was found to be more active in the rootstocks of P group in the investigated fruit trees. Intensive maltose synthesis in the fruit trees on P group rootstocks lead to the greater storage before the dormancy period. The biggest general quantity of sugars was found in the bark tissues of dwarf rootstock P 22. When growth and development is intensified, the most active transport of sugars in all investigated groups followed apple trees with less vigorous rootstocks. 2005–2007 metais Lietuvos sodininkystės ir daržininkystės institute tirta poskiepio genotipo įtaka sezoniniams cukrų pokyčiams obelyse. Atlikti bandymai su ‘Auksis’ veislės obelimis su B grupės (B.9, B.396, B.416, B.491), P grupės (P 2, P 60, P 22) ir M grupės (M.9, M.26) poskiepiais. Mažiausias bendras cukrų kiekis (fruktozės, gliukozės ir maltozės) tirtų vaismedžių ūglių žievėje nustatytas vėlyvą vasarą, M grupės poskiepiuose. Šiuo laikotarpiu kiekvienoje poskiepių grupėje daugiausiai monosacharidų kaupė obelys su augesniais poskiepiais. Bendras angliavandenių kiekis didėjo nuo vasaros iki žiemos. Prieš žiemą tirtuose vaismedžiuose ženkliai suaktyvėjo heksozių sintezė. Vaismedžiuose su P grupės poskiepiais suintensyvėjusi maltozės sintezė prieš ramybės periodą lėmė stipresnį atsarginių medžiagų kaupimą. Didžiausias bendras cukrų kiekis nustatytas žemaūgių ‘Auksis’ / P 22 obelų žievėje. Pavasarį tirtų cukrų kiekis vaismedžiuose liko nepakitęs arba sumažėjo. Suaktyvėjus augimui ir vystymuisi kiekvienoje poskiepių grupėje intensyviausiai angliavandenius pumpurams tiekė obelys su mažo augumo poskiepiais.
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- 2007
62. Effect of short-wavelength light on lettuce growth and nutritional quality
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Urbonavičiūtė, Akvilė, Pinho, Paulo, Samuolienė, Giedrė, Duchovskis, Pavelas, Vitta, Pranciškus, Stonkus, Andrius, Tamulaitis, Gintautas, Žukauskas, Artūras, and Halonen, Liisa
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Food--Quality ,Lettuce--Growth ,udc:537 ,Lettuce ,Laser pulses ,ultrashort ,Light emitting diodes ,Food ,udc:581 ,udc:635.5 ,Salotos--Augimas ,Šviosos diodai ,Maisto produktai--Kokybė ,Lazeriniai impulsai, ultratrumpieji ,Laser pulses, ultrashort - Abstract
Influence of short-wavelength light on growth, development and nutritional quality of lettuce was studied by growing lettuce Lactuca sativa L. cv. ‘Grand rapids’ in phytotron under LED-based illumination with bicomponent spectrum consisting of red component (640 nm) and short-wavelength component in cyan (500 nm), blue (460 nm), or near-UV (365 nm) regions. Biometric characteristics and concentrations of pigments and sugars were measured 39 days after germination. Drastic sensitivity of total carbohydrates concentration and relative ratio between amounts of different sugars on the spectral position of the short-wavelength component was observed. We also demonstrate that concentration of nitrites in plants grown under such bicomponent illumination is reduced in respect to the reference plants grown under illumination by conventional fluorescent lamps. Fitotrono komplekse tirtas trumpabangės šviesos poveikis salotų (Lactuca sativa L.) veislės ‘Grand rapids’ augimui, vystymuisi ir maistinei kokybei. Apšvietimui naudota bikomponenčio spektro šviesa, emituojama šviestukų (šviesos diodų) moduliuose, kuriuose raudona šviesa (640 nm) papildyta trumpabangėmis komponentėmis ciano (žaliai mėlynojoje, 500 nm), mėlynojoje (460 nm) ir artimojoje ultravioletinėje (365 nm) spektro dalyse. Biometriniai matavimai, fotosintezės pigmentų, cukrų ir nitratų analizės atliktos praėjus 39 dienoms po sudygimo. Nustatyti esminiai bendro angliavandenių kiekio ir atskirų angliavandenių santykio skirtumai salotose, išaugintose apšviečiant augalus šviesa, kurios spektre yra skirtingo bangos ilgio trumpabangės komponentės. Salotose, augintose panaudojant apšvietimą su bikomponenčiu spektru, nitratų koncentracija buvo reikšmingai mažesnė negu kontroliniuose augaluose, augintuose po įprastinėmis fluorescencinėmis lempomis.
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- 2007
63. Strawberry response to ozone stress
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Brazaitytė, Aušra, Sakalauskaitė, Jurga, Samuolienė, Giedrė, Urbonavičiūtė, Akvilė, Šabajevienė, Gintarė, Lukatkin, Aleksandr, Kolmykova, Tatjana, Šikšnianienė, Jūratė Bronė, Baranauskis, Kęstutis, Gelvonauskis, Bronislovas, Sakalauskienė, Sandra, Klimas, Evaldas, and Duchovskis, Pavelas
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Braškės--Streso poveikis ,Plants--Effect of ozone on ,Photosynthetic pigments ,Fotosintezės pigmentai ,Augalai--Ozono poveikis ,Strawberries--Effect of stress on - Abstract
Darbo tikslas – modeliuojamomis sąlygomis nustatyti ’Senga Sengana‘ veislės braškių adaptacijos prie didėjančios ozono koncentracijos galimybes. Bandymai atlikti Lietuvos sodininkystės ir daržininkystės instituto Augalų fiziologijos laboratorijos fitotroniniame komplekse. Tyrimams naudotos ‘Senga Sengana’ veislės braškės. Tirtos tokios ozono koncentracijos: 0 (kontrolė), 80, 160, 240 µg m-3 (7 val. per dieną, 5 dienas per savaitę). Nustatyta, kad tirtos ozono koncentracijos neturėjo neigiamo poveikio braškių augalų sausai masei bei lapų asimiliacinio ploto formavimuisi. Ozonu paveiktoms braškėms augant toliau, nustatytas didesnis jų grynasis fotosintezės produktyvumas negu nepaveiktų. Mažėjantis braškių šaknų ir antžeminės dalies santykis rodo, kad daugiau asimiliatų pateko į ozonu veiktų braškių lapus. Didžiausios naudotos ozono koncentracijos (160 ir 240 µg m-3) tik po mėnesio poveikio sumažino fotosintetinių pigmentų koncentraciją ir senuose, ir ozono aplinkoje susiformavusiuose jaunuose braškių lapuose. The aim of the study was to establish strawberry tolerance intervals to different ozone concentrations. Experiments were carried out in the Laboratory of plant physiology at the Lithuanian Institute of Horticulture under phytotron conditions in 2005. Strawberries ‘Senga Sengana’ were used in experiments. Different ozone concentrations were kept as follows: 0 (control), 80, 160 and 240 µg m-3. The results have shown that investigated ozone concentrations have not negative effect on strawberry plant dry weight and leaf area. Strawberries, which were affected by ozone, had higher photosynthetic productivity and according root: shoot ratio more assimilates were directed to shoot after one moth growing them without ozone. The highest ozone (160 ir 240 µg m-3) only after one month fumigation decreased photosynthetic pigment content in old and newly formed strawberries leaves.
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- 2007
64. Braškių 'Senga Sengana' prisitaikymas prie diferencijuoto ir kompleksinio UV-B spinduliuotės ir ozono poveikio
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Brazaitytė, Aušra, Sakalauskaitė, Jurga, Duchovskis, Pavelas, Šikšnianienė, Jūratė Bronė, Samuolienė, Giedrė, Ulinskaitė, Raimonda, Baranauskis, Kęstutis, Urbonavičiūtė, Akvilė, Šabajevienė, Gintarė, Gelvonauskis, Bronislovas, Uselis, Nobertas, and Vagusevičienė, Ilona
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Plants--Effect of ozone on ,Braškės--Augimas ,Augalai--Ultravioletinio spinduliavimo poveikis ,Photosynthetic pigments ,Fotosintezės pigmentai ,Augalai--Ozono poveikis ,Plants--Effect of ultraviolet radiation on ,Strawberries--Growth - Abstract
2005 m. Lietuvos sodininkystės ir daržininkystės instituto fitotrono komplekse nustatytas diferencijuotas ir kompleksinis UV-B spinduliuotės bei ozono poveikis braškių augimui ir fotosintezės pigmentų pokyčiams bei jų prisitaikymo prie šių stresorių galimybės. Poveikis stresą sukeliančiais veiksniais buvo skirstomas į du laikotarpius: adaptacijos ir pagrindinį. Ozono koncentracija adaptacijos laikotarpiu buvo 80 µg m-3, o pagrindinio poveikio – 240 µg m-3. Tokia koncentracija buvo palaikoma 7 val. per dieną, penkias dienas per savaitę. UV-B spinduliuotės dozė adaptacijos laikotarpiu buvo 4 kJ m-2 d-1, o pagrindinio poveikio metu – 8 kJ m-2 d-1. Šios dozės buvo palaikomos savaitę. Didžiausias braškių fotosintezės pigmentų sistemos prisitaikymo efektas nustatytas tada, kai adaptacijos laikotarpiu augalų poveikis ozonu buvo silpnas, o pagrindinio poveikio laikotarpiu jie gavo didelę UV-B spinduliuotės dozę (8 kJ m-2 d-1). Per trumpą laiką braškėse, pagrindinio poveikio metu gavusiose UV-B, įvyko tik fiziologinė adaptacija, o morfologinė nepasireiškė, nes sausos masės bei lapų ploto prieaugis nebuvo nustatytas. Braškių fotosintezės pigmentų sistema, adaptacijos laikotarpiu paveikta silpnesniais stresoriais, neprisitaikė prie didesnės ozono dozės pagrindinio poveikio metu. Research to distinct and complex effect of ozone and UV-B rays on strawberry growth and photosynthesis pigments changes and their adaptive possibilities to such stressors were carried out under phytotron conditions. The exposure to stress factors was divided into two main steps: adaptive and main. Ozone amounts of 80 µg m-3 for adaptive and 240 µg m-3 for main exposure were maintained 7 h per day, 5 days per week. UV-B dosages of 4 kJ m-2 d-1 for adaptive and 8 kJ m-2 d-1 for main exposure were maintained one week. Greatest effect of strawberry photosynthesis system adaptation was established when they was pre-treated with low ozone concentration and was affected with high UV-B (8 kJ m-2 d-1) dose under main exposure. During the short time in strawberries, which was affected by UV-B under main exposure, occurred physiological adaptation. Morphological adaptation was not evidenced because increase of dry matter and leaf area was not determined. Photosynthesis pigments system of strawberries, which was pre-treated stressors of low concentration, did not adapted to higher ozone concentration under main exposure.
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- 2007
65. Elevated CO2 concentration effect on radish
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Sakalauskienė, Sandra, Sakalauskaitė, Jurga, Brazaitytė, Aušra, Duchovskis, Pavelas, Urbonavičiūtė, Akvilė, Šikšnianienė, Jūratė Bronė, Samuolienė, Giedrė, Šabajevienė, Gintarė, and Baranauskis, Kęstutis
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Radishes ,Augalų fiziologija ,Anglies diolsidas--Fiziologinis poveikis ,Plant physiology ,Carbon dioxide--Physiological effect ,Ridikai - Abstract
Vegetaciniai bandymai atlikti 2005 m. Lietuvos sodininkystės ir daržininkystės instituto Augalų fiziologijos laboratorijos fitotroniniame komplekse. Tirtas tokių CO2 koncentracijų ore poveikis augalams: 350 (kontrolė), 700, 1 500 ir 3 000 ppm (visą parą). Bandymo metu buvo 16 val. fotoperiodas, dienos (nakties) temperatūra – 24°C (17°C). Po 10 dienų poveikio ir 7 dienų regeneracijos periodo buvo atlikti augalų biometriniai matavimai, išmatuotas lapų plotas, nustatyta fotosintetinių pigmentų koncentracija ridikėlių lapuose ir sausųjų medžiagų kiekis ridikėlių lapuose ir šakniavaisiuose. Nustatyta, kad skirtingos CO2 koncentracijos turėjo įtakos ridikėlių fotosintetinių rodiklių kitimui. 10 dienų veikiant augalus 1 500 ppm CO2 koncentracija, suintensyvėjo visų fotosintezės pigmentų sintezė ridikėlių lapuose ir padidėjo lapų plotas. 700 ppm CO2 koncentracija slopino šakniavaisio vystymąsi, tačiau esant didesnėms koncentracijoms (1 500 ir 3 000 ppm) to nenustatyta. Po 10 dienų poveikio ir 7 dienų regeneracijos periodo nustatytas didžiausias 700 ppm CO2 koncentracija paveiktų ridikėlių lapų ir šaknų santykis. The aim of the study was to establish the radish (Raphanus sativus L.) tolerance to elevated carbon dioxide (CO2) concentrations. Vegetative experiments were carried out in the Laboratory of plant physiology at the Lithuanian Institute of Horticulture under phytotron conditions in 2005. Different CO2 concentrations were kept as follows: 350 (control), 700, 1500 and 3000 ppm 24 ours per day. Photoperiod was 16 ours, day/night temperature – 21°C/17°C. Biometric measurements: leaf area, concentration of photosynthetic pigments and amount of dry matter were determined after 10 day effect and 7 days regeneration period. It was determined, that different CO2 concentrations influenced photosynthetic parameter variation. 1500 ppm concentration of CO2 induced syntheses of photosynthesis pigments and had influence on leaves area. The highest shootroot ratio and decreased development of rhizocarp was determined under 700 ppm concentration of CO2.
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- 2007
66. Cadmium resistance of apple rootstocks M.9 and B.396 in vitro
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Sakalauskaitė, Jurga, Stanienė, Gražina, Stanys, Vidmantas, Duchovskis, Pavelas, Samuolienė, Giedrė, Baranauskis, Kęstutis, Urbonavičiūtė, Akvilė, Revin, Viktor, and Lukatkin, Aleksandr S.
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Sacharidai ,Apples ,Grafting ,Obelys ,Kadmis ,Saccharides ,Augalų auginimo terpė ,Plant growing media ,Skiepijimas (augalininkystė) ,Cadmium - Abstract
The aim of the study was to evaluate the impact of cadmium ions on growth of apple-tree rootstocks M.9 and B.396, photosynthesis apparatus development and synthesis of carbohydrates in vitro. Cadmium ions hindered the microshoots growth of rootstock M.9 more as compared to rootstock B.396. Statistically significant decrease in chlorophyll a was determined in the leaves, when inconsiderable amount of CdSO4 was added into the growth medium. Chlorophyll b and carotenoids content in the microshoot leaves depended on cadmium content in the growth medium and genetic nature of rootstocks. Cadmium induced accumulation of fructose and sucrose in the leaves of both rootstocks. Furthermore, synthesis of maltose was initiated in the microshoot leaves of rootstock M.9 when 10 μM CdSO4 was added into the growth medium, while glucose, galactose and maltose were being accumulated, when rootstock B.396 was treated with 5 and 10 μM CdSO4. Rootstocks M.9 and B.396 responded differently to cadmium impact. Cadmium had greater impact on microshoot growth, pigment content and sugar alternation in leaves of rootstock M.9 than B.396. Tyrimo tikslas – įvertinti kadmio (Cd) jonų poveikį obelų poskiepių M.9 ir B.396 regeneracijai, fotosintetinio aparato kūrimui ir angliavandenių sintezei in vitro augimo terpėje. Cd jonai labiau stabdė M.9 poskiepio mikroūglių augimą nei B.396 poskiepio. Net ir nedidelis CdSO4 kiekis maitinamojoje terpėje chlorofilo a kiekį lapuose sumažino iš esmės. Chlorofilo b ir karotinoidų kiekis mikroūglių lapuose priklausė nuo Cd koncentracijos auginimo terpėje ir poskiepio genetinės prigimties. Cd skatino fruktozės ir sacharozės kaupimąsi abiejų poskiepių lapuose. Kai terpėje CdSO4 koncentracija buvo 10 μM, M.9 poskiepio mikroūglių lapuose pradėjo kauptis maltozė, kai 5 ir 10 μM – B.396 poskiepio lapuose kaupėsi gliukozė, galaktozė ir maltozė. Poskiepiai M.9 ir B.396 skirtingai reagavo į Cd poveikį: Cd turėjo didesnės įtakos mikroūglių augimui, pigmentų kiekiui ir cukrų kitimams M.9 poskiepio lapuose nei B.396 poskiepio.
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- 2006
67. Performance of carrot photosynthetic system under subambient UV-B levels
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Baranauskis, Kęstutis, Sakalauskaitė, Jurga, Brazaitytė, Aušra, Samuolienė, Giedrė, Šabajevienė, Gintarė, Šikšnianienė, Jūratė Bronė, Urbonavičiūtė, Akvilė, and Duchovskis, Pavelas
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Ultraviolet radiation ,Carrots ,Ultravioletinis spinduliavimas ,Photosynthetic pigments ,Morkos ,Fotosintezės pigmentai - Abstract
When studying carrot (Daucus sativus Röhl.) tolerance to subambient levels of UV-B radiation (1 to 9 kJ m2 day-1), reduction of biomass accumulation as a measure of UV-B stress impact appeared to be inappropriate. Measurements of chlorophyll content also revealed that such data is inapplicable to gauge plant health during and after the UV-B stress. However, this study revealed that carrot is tolerant to subambient UV-B stress as no regular variation of aforementioned conventional measures was determined. Furthermore, naturally occurring UV-B levels (1 to 5 kJ m2 day-1) appeared to be even favorable for stimulating biomass accumulation without hindering the formation of photosynthetic pigments. Tirtas augalų fotosintetinės sistemos darbas, kai jie paveikti artimu natūraliai UV-B radiacijai kiekiu – 1-9 kJ m2 parą-1 dozėmis. Tyrimo objektas – valgomoji morka (Daucus sativus Röhl.) ‘Garduolės 2’. Nustatyta, kad morkos biomasės sumažėjimas yra netinkamas rodiklis UV-B sąlygotiems pažeidimams įvertinti. Fotosintezės pigmentų kiekio kitimas UV-B streso metu bei po jo nebuvo charakteringas ar dėsningas. Tai rodo, jog ir šis kriterijus negali būti naudojamas morkos fizinei būklei įvertinti UV-B streso metu. Galima teigti, kad valgomoji morka yra tolerantiška minėtoms UV-B radiacijos dozėms. Kai kuriais atvejais šis stresas, praėjus kelioms savaitėms po poveikio, paskatino biomasės akumuliaciją ir nesutrikdė fotosintezės pigmentų sistemos pusiausvyros.
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- 2006
68. Morkų fotosintetinės sistemos reakcija į didėjančią anglies dioksido (CO2) koncentraciją
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Sakalauskaitė, Jurga, Brazaitytė, Aušra, Duchovskis, Pavelas, Samuolienė, Giedrė, Urbonavičiūtė, Akvilė, Šabajevienė, Gintarė, Šikšnianienė, Jūratė Bronė, and Baranauskis, Kęstutis
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Carrots ,Biometry ,Morkos ,Anglies dioksidas--Fiziologinis poveikis ,Photosynthetic pigments ,Fotosintezės pigmentai ,Biometrija ,Carbon dioxide--Physiological effect - Abstract
Vegetaciniai bandymai atlikti 2005 m. LSDI Augalų fiziologijos laboratorijos fitotroniniame komplekse. Darbo tikslas – nustatyti morkų tolerancijos didesnei anglies dioksido (CO2) koncentracijai ribas. Tirtos valgomosioms morkoms (Daucus sativus Röhl.) Garduolės 2 tokios koncentracijos CO2 ore poveikis: 350 (kontrolinis var.), 700, 1 500 ir 3 000 ppm. Šios anglies dioksido koncentracijos laikytos visą parą, poveikio trukmė – 10 parų. Bandymo pabaigoje atlikti augalų biometriniai matavimai, nustatyta fotosintetinių pigmentų koncentracija, apskaičiuotas fotosintezės produktyvumas. Ištirta, kad tik didžiausia CO2 koncentracija – apie 3 000 ppm paskatino visų fotosintezės pigmentų sintezę morkų lapuose. Chlorofilas b buvo labiausiai reaguojantis pigmentas į CO2 kitimą. Karotinoidų sintezės slopinimą ar stimuliavimą lėmė CO2 koncentracija aplinkoje. Esant dvigubai ir apie keturis kartus didesnei už dabartinę CO2 koncentracijai, pastebėtas morkų lapų, šakniavaisių augimo bei sausųjų medžiagų kaupimo slopinimas. Galima teigti, kad dabartinė CO2 koncentracija (~350 ppm) nėra morkų produktyvumą limituojantis veiksnys. Vegetative experiments were carried out under phytotron conditions in the Laboratory of Plant Physiology at the Lithuanian Institute of Horticulture in 2005. The aim of the study was to establish the carrot tolerance intervals to elevated carbon dioxide (CO2) concentrations. Carrot (Daucus sativus Röhl. cv. Garduolės 2) was used in vegetative experiments. Different CO2 concentrations were kept as follows: 350 (control), 700, 1500 and 3000 ppm. Plants were treated with such CO2 concentrations 24 h per day, 10 days. Biometric measurements of plants, photosynthetic pigment concentration and photosynthesis productivity were determined at the end of treatment. It was determined, that the greatest applied CO2 concentration (3000 ppm) significantly increased synthesis of all photosynthetic pigment in carrot leaves. Chlorophyll b responded the most to elevated CO2 concentration. Inhibition and stimulation of carotenoids synthesis depended on CO2 concentration ambience. The inhibition of carrot leaves and rhizocarp growth, also dry matter accumulation was observed at double and four times higher CO2 concentration. According to the results, we can assume that present CO2 concentration (~350 ppm) is not a factor limiting carrots productivity.
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- 2006
69. UV-B spinduliuotės poveikis morkų biometriniams rodikliams
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Sakalauskienė, Sandra, Brazaitytė, Aušra, Sakalauskaitė, Jurga, Šikšnianienė, Jūratė Bronė, Samuolienė, Giedrė, and Duchovskis, Pavelas
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Carrots ,Biometry ,Morkos ,Augalai--Ultravioletinio spinduliavimo poveikis ,Plants--Effect of ultraviolet radiation on ,Biometrija - Abstract
Lietuvos sodininkystės ir daržininkystės institute fitotrono komplekse 2005 metais buvo tyrimai siekiant nustatyti UV-B spinduliuotės poveikį morkų biometriniams rodikliams. Po sudygimo praėjus trims savaitėms, morkos septynias dienas buvo švitinamos atitinkama UV-B spinduliuotės doze. Tirtas tokių UV-B spinduliuotės dozių poveikis morkų biometriniams rodikliams: 0 (kontrolė), 1, 3, 5, 7 ir 9 kJ m-2 d-1. Bandymo metu buvo 16 val. fotoperiodas, temperatūra dieną +21°C, naktį – +17°C. Pasibaigus UV-B poveikiui, kas dvi savaites buvo atliekami augalų biometriniai matavimai. 1 kJ m2 d-1 UV-B spinduliuotės dozė stimuliavo morkų fiziologinius procesus. Šia doze paveiktų morkų šakniavaisiuose buvo sukaupta daugiausiai sausųjų medžiagų. Morkose, paveiktose 5 ir 7 kJ m-2 d-1 UV-B spinduliuotės dozėmis, pasireiškė kompensaciniai reiškiniai, suaktyvėjo adaptaciniai procesai. Vegetative experiments were carried out in Laboratory of Plant Physiology at the Lithuanian Institute of Horticulture under phytotron conditions in 2005. The aim of the study was to establish the impact of different UV-B doses on biometric indexes of carrots. Plants were treated with different UV-B doses: 0 (reference), 1, 3, 5, 7 ir 9 kJ m-2 d-1. A photoperiod of 16 h was used and air temperature of 21/17°C (day/night) was maintained throughout the experiment. Biometric measurements of plants and photosynthesis productivity were determined at the end of treatment, two weeks and four weeks after the treatment. The UV-B dose of 1kJ m2 d-1 stimulated the physiological processes in the plants. The greatest content of dry weight in carrots rhizocarp was accumulated applying this dose. The UV-B doses of 5and 7 kJ m-2 d-1 induced the adaptive mechanisms in carrots.
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- 2006
70. Obelų fotosintetinės sistemos reakcija į ozono sukeltą stresą
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Sakalauskaitė, Jurga, Brazaitytė, Aušra, Samuolienė, Giedrė, Urbonavičiūtė, Akvilė, Šabajevienė, Gintarė, Šikšnianienė, Jūratė Bronė, Baranauskis, Kęstutis, Gelvonauskis, Bronislovas, and Duchovskis, Pavelas
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Plants--Effect of ozone on ,Apples ,Photosynthetic pigments ,Obelys ,Fotosintezės pigmentai ,Augalai--Ozono poveikis - Abstract
Darbo tikslas – modeliuojamomis sąlygomis nustatyti obelų tolerancijos sritis ozono poveikiui. Bandymai atlikti LSDI Augalų fiziologijos laboratorijos fitotroniniame komplekse. Tirtos vienametės obelaitės (Alvo P60) ir tokios ozono koncentracijos: 0 (kontroliniai augalai), 80, 160, 240 μg m-3 (7 h per dieną, 5 dienas per savaitę). Bandymo pradžioje (savaitė po ozono poveikio), pabaigoje ir praėjus mėnesiui po ozono poveikio obelų lapuose nustatyta fotosintetinių pigmentų koncentracija. Visų koncentracijų ozonas slopino fotosintetinių pigmentų sintezę obelų lapuose. Ypač jautriai į ozono poveikį reagavo chlorofilas a bei karotinoidai. Mažiausia ozono koncentracija 80 μg m-3 įjungdavo homeostazės mechanizmus, dėl kurių fotosintetinių pigmentų sintezė susilygindavo su kontrolinių augalų. 160 ir 240 μg m-3 koncentracijos ozoną obelys toleravo, nes skatino fotosintetinių pigmentų irimą netgi naujai, ozono aplinkoje, susiformavusiuose lapuose. The aim of the study was to establish the apple-tree tolerance intervals to different ozone concentrations. Experiments were carried out at the Laboratory of plant physiology at the Lithuanian Institute of Horticulture under phytotron conditions in 2005. One-year-old apple-trees (Alvo P60) were used in experiments. Different ozone concentrations were kept as follows: 0 (control), 80, 160 and 240 μg m-3. Plants were treated with such ozone concentrations 7 h per day, 5 days per week. Photosynthetic pigment concentration was determined at the start (one week after treatment), at the end of treatment and one week after the end of experiment. Either used ozone concentration inhibited synthesis of all photosynthetic pigments in apple-tree leaves. Chlorophyll a and carotenoids were more sensitive to ozone than chlorophyll b. The minimal used ozone concentration (80 μg m-3) induced homeostasis mechanisms, as a result photosynthetic pigment synthesis in apple-trees treated with ozone equalized to the level of control plants. 160 and 240 μg m-3 ozone concentrations were not tolerated by apple-trees, because induced the degradation of photosynthetic pigment even in new apple-tree leaves developed under exposure to ozone.
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- 2006
71. The response of radish phytohormone system to ozone stress
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Urbonavičiūtė, Akvilė, Ulinskairė, Raimonda, Samuolienė, Giedrė, Sakalauskaitė, Jurga, Duchovskis, Pavelas, Brazaitytė, Aušra, Šikšnianienė, Jūratė, Bronė, Šabajevienė, Gintarė, and Baranauskis, Kęstutis
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Radishes ,Ozone--Physiological effect ,Augalų hormonai ,Plant hormones ,Ozonas--Fiziologinis poveikis ,Ridikai - Abstract
Experiments were performed at the Lithuanian Institute of Horticulture, Phytotron complex in 2005. The object of this study was to evaluate the effect of different ozone concentrations on phytohormone system in radish (Raphanus sativus L., cv. Žara) leaves. The exposure of 80, 160, and 240 µg m-3 ozone concentrations was maintained for seven days. Day/night temperature was 21°C/17°C, photoperiod – 16 h. Phytohormones (gibberellic acid, zeatin, indolyl-3-acetic acid and abscisic acid) content analysis was performed using chromatographic method. Phytohormone balance is a suitable indicator of the elevated ozone impact on physiological processes. These plant hormones do not act independently in response to ozone, but rather in a complex signaling network. According to phytohormone contents, radish under 160 µg m-3 treatment experienced the highest stress. The increase in phytohormones (zeatin, indolyl-3-acetic acid and abscisic acid) level after two weeks regeneration period is associated with the reaction of compensatory mechanisms and the regeneration of plant organs. Darbo tikslas – įvertinti skirtingų ozono koncentracijų įtaką ridikėlio (Raphanus sativus L., cv. Žara) fitohormonų sistemai. 80, 160 ir 240 µg m-3 ozono koncentracijos fitokamerose buvo laikomos septynias dienas. Dienos/nakties temperatūra – 21/17°C, fotoperiodas – 16 h. Fitohormonų (giberelo rūgšties, zeatino, indolil-3-acto rūgšties ir abscizo rūgšties) analizė atlikta naudojant efektyviąją skysčių chromatografiją. Fitohormonų sistemos pusiausvyra yra tinkamas indikatorius ozono poveikui fiziologinams procesams vertinti. Pagal gautus rezultatus ridikėliai, paveikti 160 µg m-3 ozono koncentracija, patyrė didžiausią stresą. Padidėjusios zeatino, indolil-3-acto rūgšties ir abscizo rūgšties koncnetracijos po dviejų savaičių regeneracijos periodo siejamas su kompensacinių mechanizmų reakcija ir augalo organų regeneravimu.
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- 2006
72. Dynamics and role of phytohormones in common caraway after flowering induction
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Samuolienė, Giedrė and Duchovskis, Pavelas
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Augalų žydėjimas ,Augalų hormonai ,Plant hormones ,Skėtiniai ,Umbelliferae ,Plants, flowering of - Abstract
Lietuvos sodininkystės ir daržininkystės instituto fitotroniniame komplekse modeliuojamomis sąlygomis atlikti paprastojo kmyno (Carum carvi L.) fitohormonų dinamikos ir vaidmens tyrimai skirtingais žydėjimo iniciacijos tarpsniais. Tyrimo tikslas – nustatyti fitohormonų veiklos sąsajas su žydėjimo iniciacijos procesais. Giberelo, indolil-3 acto ir abscizo rūgštims bei zeatinui skirstyti ir nustatyti naudotas efektyviosios skysčių chromatografijos metodas (HPLC) su diodų matricos detektoriumi. Fotoperiodo ir temperatūros sąlygos žydėjimo indukcijos metu: EXP1 – 0 val. ir 4oC, EXP2 – 8 val. ir 4oC, EXP3 – 16 val. ir 4oC, EXP4 – 8 val. ir 21(16)oC, EXP5 – 16 val. ir 21 (16)oC (dienos (nakties) temperatūra). Tyrimai parodė, kaip įvairiais evokacijos bei žiedų iniciacijos tarpsniais kinta fitohormonų koncentracijos bei jų santykis. Augalų žydėjimo iniciacijos procesai susiję su juvenalinio periodo trukme. Paprastojo kmyno juvenalinio tarpsnio pabaiga siejama su tuo momentu, kai augalas skrotelėje suformuoja 9 asimiliuojančius lapus. Rezultatai parodė, kad tamsoje kmynai ir su 7, ir su 9 lapais skrotelėje visai nesivystė ir sunyko. Geriausiai floralinis vystymasis pasireiškė augalus veikiant žema teigiama temperatūra ir ilgos dienos fotoperiodu. Šiomis sąlygomis GA3 ir ABA santykis. This study was aimed on investigation of phytohormones dynamic and role in common caraway (Carum carvi L.) during different flowering initiation stages. The process of common caraway flowering initiation and morphogenesis was studied in a phytotron facility. Different level of development is needed for photo- and thermoinduction of caraway. 9 leaves in rosette are needed to complete the juvenile period. High-performance liquid chromatography (HPLC) with diode array detection was used for separation and determination of gibberellic, indol-3-acetic and abscisic acids, and zeatin. Conditions of photo and thermoperiod during flowering induction: EXP2 – 8 hr and 4°C, EXP3 – 16 hr and 4°C, EXP4 – 8 hr and 21/16°C, EXP5 – 16 hr and 21/16°C. Our results showed that under dark treatment both in caraway with 7 and 9 leaves in rosette did not develop at all and rotted away. The best floral development was observed when plants were treated under low positive temperature and long day photoperiod (EXP3). Under these conditions the GA3/IAA ratio during evocation stages.
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- 2006
73. Physiological and biochemical response of seeding pea (Pisum sativum L.) to ozone effects
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Juozaitytė, Rima, Ramaškevičienė, Asta, Sliesaravičius, Algirdas, Burbulis, Natalija, Duchovskis, Pavelas, Brazaitytė, Aušra, and Samuolienė, Giedrė
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Ozone--Physiological effect ,Ozonas--Fiziologinis poveikis ,Biomass ,Žirniai--Augimas ,Pisum--Growth ,Biomasė - Abstract
2005 m. LŽŪU Genetikos ir biotechnologijos laboratorijoje bei LSDI Augalų fiziologijos laboratorijos fitotroniniame komplekse atlikti vegetaciniai bandymai. Tyrimo tikslas – nustatyti skirtingų koncentracijų ozono poveikį sėjamojo žirnio (Pisum sativum L.) ’ILGIAI’ fiziologiniams ir biocheminiams rodikliams. Tirtas tokių koncentracijų ozono poveikis augalams: 80, 160, 240 µg m-3 (7 h per dieną, 5 dienas per savaitę). Po 1, 3, 5 dienų poveikio išmatuotas lapų plotas, nustatyta antžeminės dalies bei šaknų sausoji biomasė, chlorofilo a, karotinoidų, mono- ir disacharidų kiekis lapuose. Ištirta, kad, didėjant ozono poveikio trukmei bei koncentracijai ore, didėjo ir ozono toksiškas poveikis sėjamojo žirnio (Pisum sativum L.) fiziologiniams bei biocheminiams rodikliams. Po vienos dienos poveikio nustatytas toksiškas ozono poveikis antžeminės dalies ir šaknų sausosios biomasės kaupimuisi bei lapų plotui. Toksiškas ozono poveikis nustatytas mono- ir disacharidų bei pigmentų kaupimuisi lapuose. Investigations were carried out at the Genetic – Biotechnology Laboratory of the Lithuanian University of Agriculture and chambers of phytotron complex, of the Lithuanian Institute of Horticulture in 2005. The object of the work was to test the response of seeding pea (Pisum sativum L.) physiological and biochemical indices to different ozone concentrations. The test subject was seeding pea (Pisum sativum L.) Ilgiai. The following ozone concentrations were investigated to establish the impact: 80, 160, 240 µg m-3 (7 h each day, 5 days per week). After 1, 3, 5 days there were determined the number of leaves, above-ground and root dry biomass, content of chlorophyll a, carotenoids, mono- and disaccharides in leaves of peas. It was established that ozone had an increasing toxic effect on pea physiological and biochemical indices at growing expositions and concentrations. After 1-day ozone exposition toxic ozone effect was established on above-ground and root dry biomass accumulation and the number of leaves. Under toxic ozone effect synthesis of mono- and disaccharides accumulation was determinate in pea leaves.
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- 2006
74. Valgomojo ridiko adaptacija prie kompleksinio rūgštaus substrato ir kadmio jonų poveikio
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Brazaitytė, Aušra, Sakalauskaitė, Jurga, Duchovskis Pavelas, Šikšnianienė, Jūratė Bronė, Samuolienė, Giedrė, Ulinskaitė, Raimonda, Baranauskis, Kęstutis, Urbonavičiūtė, Akvilė, Šabajevienė, Gintarė, Navarskaitė, Lijana, and Strakšas, Vilius
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Chlorophyll ,Coils--Cadmium content ,Radishes--Growth (plants) ,Dirvožemiai--Kadmio kiekis ,Ridikai--Augimas (augalai) ,Karotinoidai ,Chlorofilas ,Augalų auginimo terpė ,Plant growing media ,Carotenoids - Abstract
Lietuvos sodininkystės ir daržininkystės instituto Augalų fiziologijos fitotrono komplekse tirta ridikėlių fiziologinė reakcija į diferencijuotą ir kompleksinį rūgštaus substrato ir kadmio jonų poveikį bei augalų adaptacines galimybes prisitaikyti prie šių stresorių. Bandymas atliktas dviem etapais. Adaptaciniam poveikiui ištirti rūgšties koncentracija buvo 3 ml H2SO4 litrui vandens, o kadmio – 0,06mM 3CdSO4•8H2O. Pagrindiniam poveikiui ištirti rūgšties koncentracija buvo 4 ml H2SO4 litrui vandens, o kadmio – 3mM 3CdSO4•8H2O. Nustatyta, kad rūgštus lietus sužadina fotosintezės pigmentų sistemos adaptacijos mechanizmus pakartotiniam substrato parūgštinimui. Kadmis ridikėlius veikė toksiškai, todėl homeostazė nepasireiškė. Research on radish physiological response to distinct and complex effect of substratum acidity and cadmium ions and their adaptation possibilities to these stressors were carried out in the phytotron of Plant Physiology Laboratory, Lithuanian Institute of Horticulture. The exposure to stress factors was divided into two main steps: adaptive and main. Acid concentration for adaptive effect was 3ml H2SO4 for 1 l of water and cadmium concentration was 0.06mM 3CdSO4•8H2O. Acid concentration for main effect was 4 ml H2SO4 for 1 l of water and cadmium concentration was 3mM 3CdSO4•8H2O. Radish height, biomass accumulation, amounts of photosynthetic pigments in leaves was determined. It was established that acid rain stimulate adaptation of radish photosynthetic pigments system for repeatedly acidification of substratum. Cadmium affects radish toxically though homeostasis did not evidence.
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- 2006
75. UV sugeriančių pigmentų pokyčiai augalų lapuose veikiant UV-B spinduliuotei
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Baranauskis, Kęstutis, Sakalauskaitė, Jurga, Brazaitytė, Aušra, Urbonavičiūtė, Akvilė, Samuolienė, Giedrė, Šabajevienė, Gintarė, Sakalauskienė, Sandra, Šikšnianienė, Jūratė Bronė, and Duchovskis, Pavelas
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Plants--Leaves ,Augalai--Lapai (botanika) ,Pigmentai(biologija) ,Augalai--Ultravioletinio spinduliavimo poveikis ,Pigments (biology) ,Plants--Effect of ultraviolet radiation on - Abstract
Variability of UV-absorbing compounds in leaves of Daucus sativus Röhl., Fragaria ananassa Duch. Malus domestica and Raphanus sativus L. under different UV-B exposure was examined. Effect of an additional stress including increased temperature (25°C-day/16°C-night) and CO2 level (700 ppm) on UV-screening compound in Malus domestica and Raphanus sativus L. leaves was identified as well. In general, this study revealed that plant response to UV-B exposure intensity is very species-specific only under non-stressful conditions; i. e. favorable temperature and ambient CO2 level, though a linear relationship between concentration of UV-absorbing compounds and UV-B daily doses has not been determined. Content of UV-screening compounds appeared to be more determined by stressors including an increased temperature and CO2 level rather than an intensity of exposure to UV-B radiation. Tyrimo metu buvo stebimi UV sugeriančių pigmentų pokyčiai Daucus sativus Röhl., Fragaria ananassa Duch. Malus domestica ir Raphanus sativus L. augalų lapuose, veikiant 2 ir 4 kJ UV-B dienos dozėmis. Taip pat nustatyta UV sugeriančių pigmentų kaita Malus domestica ir Raphanus sativus L. augalų lapuose, veikiant UV-B, aukštai temperatūrai (+ 25°C dieną ir + 16°C naktį) ir padidintai CO2 koncentracijai (700 ppm). Nustatyta, kad augalo atsakas į UV-B spinduliuotę itin priklauso nuo augalo rūšies tik tada, kai nėra papildomo streso poveikio, t. y. kai yra palanki augalams augti temperatūra (+ 21°C dieną ir + 14°C naktį) bei natūrali CO2 koncentracija. Tačiau tokiomis sąlygomis nepavyko nustatyti tiesioginio priklausomumo tarp UV sugeriančių pigmentų kiekio ir UV-B spinduliuotės poveikio intensyvumo. Įvertinus tyrimų rezultatus, galima teigti, jog UV sugeriančių pigmentų kiekis augalų lapuose labiau priklauso nuo tokių veiksnių kaip aukšta temperatūra ar padidėjusi CO2 koncentracija nei tiesioginis UV-B spinduliuotės poveikis.
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- 2006
76. The effect of ozone and UV-B radiation on phytohormone system in carrot
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Urbonavičiūtė, Akvilė, Samuolienė, Giedrė, Sakalauskaitė, Jurga, and Duchovskis, Pavelas
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Ultraviolet radiation ,Morkos--Adaptacija ,Ultravioletinis spinduliavimas ,Ozone--Physiological effect ,Ozonas--Fiziologinis poveikis ,Carrots--Adaptation - Abstract
2005 m. Lietuvos sodininkystės ir daržininkystės institute fitotrono komplekse atliktų tyrimų tikslas – įvertinti skirtingų UV-B spinduliuotės dozių bei kompleksinio UV-B ir ozono poveikio efektą valgomosios morkos (Daucus carota L.) Garduolės 2 fitohormonų sistemai. Pirmojo eksperimento metu penkias dienas augalai fitokamerose švitinti 1, 3, 5, 7 ir 9 kJ m-2 UV-B spinduliuotės dozėmis. Dienos/nakties temperatūra 21/17°C, fotoperiodas 16 h. Antrojo eksperimento metu streso faktorių poveikis padalytas į dvi dalis: adaptacinis periodas ir pagrindinis poveikis. Septynias valandas per dieną ir penkias dienas per savaitę adaptacinio periodo metu augalai veikti 80 µg m-3 koncentracijos ozonu ir 240 µg m-3 pagrindinio poveikio metu. UV-B spinduliuotės dozės atitinkamai 4 ir 8 kJ m-2 adaptacinio ir pagrindinio poveikio metu. Fitohormonų analizės darytos po dviejų savaičių stresorių poveikio. Fitohormonų (giberelo rūgšties, zeatino, indolil-3-acto rūgšties ir abscizo rūgšties) analizė atlikta naudojant efektyviąją skysčių chromatografiją. Morkų fitohormonų sistema jautriai ir dėsningai reaguoja į kompleksinį UV-B spinduliuotės ir ozono efektą bei dalyvauja vykstančiuose adaptaciniuose procesuose. Augalai tolerantiški visoms UV-B spinduliuotės dozėms. Jautriausiai į šį stresorių reagavo indolil-3-acto rūgštis. Didesnės ABA ir zeatino koncentracijos dėl kompleksinio stresorių poveikio rodo jų svarbų vaidmenį adaptyvumo mechanizmams. Experiments were performed at the Lithuanian Institute of Horticulture, phytotron complex in 2005. The object of this study was to evaluate the effect of different UV-B radiation levels and the complex UV-B and ozone effect on phytohormone system in carrot (Daucus carota L.) Garduolės 2 leaves. During the first experiment plants were exposed to 1, 3, 5, 7 ir 9 kJ m-2 UV-B radiation levels for five days. Day/night temperature was 21°C/17°C, photoperiod – 16 h. During the second experiment, the exposure of stress factors was divided into adaptive period and the main effect. 7 hours per day and 5 days per week plants were exposed to 80 µg m-3 ozone concentration during adaptation period and to 240 µg m-3 during the main effect. UV-B radiation levels were respectively, 4 and 8 kJ m-2 during adaptation period and main effect. The analysis was performed after two weeks of exposure. Phytohormones (gibberellic acid, zeatin, indolyl-3-acetic acid and abscisic acid) content analysis was performed using chromatographic method. Phytohormone system responsively and consistently reacts to the complex effect of UV-B radiation and ozone and also participates in adaptation mechanisms. Plants were tolerant to all analysed UV-B radiation dozes, though indolyl-3-acetic acid was the most sensitive to UV-B stress. The increase in zeatin and abscisic acid concentrations showed their importance in adaptation processes.
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- 2006
77. Quality and developmental changes in white head cabbage (Brassica oleracea L.) and radish (Raphanus sativus L.) during winter storage.
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VIKELIENĖ, Alina, SAMUOLIENĖ, Giedrė, KARKLELIENĖ, Rasa, VIKELIS, Pranas, SASNAUSKAS, Audrius, and DUCHOVSKIS, Pavelas
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COLE crops , *RADISHES , *FLOWERING of plants , *PLANT hormones , *PLANTS in winter - Abstract
The aim of this study was to investigate the changes of quality indices and to evaluate the action of phytohormones and soluble sugars in developmental processes of Brassicaceae plants: white head cabbage (Brassica oleracea L., 'Rocktor H') and winter type radish (Raphanus sativus L., 'Murzynka') during winter storage. Radish and white head cabbage were harvested on the 19th of September and 14th of October, respectively. The switching from juvenile period (II organogenesis stage) to reproductive (III organogenesis stage) development started in November for white head cabbage and in January for radish, winter type, and conditioned the beginning of evocation processes. The mitotic activity of apical meristems started, and the development of floral meristems was observed only in spring - IV organogenesis stage was identified. Thus, this means that processes of II evocation stage can occur during storage, at low temperature conditions and in the dark for both plants. The increasing pattern of reducing sugars, sucrose, total sugars and soluble solids could be due to slower rate of hydrolysis of carbohydrates, which has implication for better quality maintenance. On the other hand, significant decline of hexoses (about 1.5 and 4.7 times in white head cabbage and radish, respectively) and sucrose (about 2.0 and 19.0 times in white head cabbage and radish, respectively), probably due to sugar cleavage, in storage organs of both harvested vegetables was observed during storage. The increasing pattern of hexoses, especially glucose (2.2 times in both plants), sucrose (7.5 times in white head cabbage), gibberellin (1.3 and 2.2 times in white head cabbage and radish, respectively) and indole-3-acetic acid (0.8 times in white head cabbage) during evocation (III and IV organogenesis stages) was observed in apical meristems of both plants. Thus many developmental processes, including cell division within the apical meristems and flowering, appear to depend on sugar-hormone signalling pathway. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
78. Dimensions of the determination methodology of white cabbage (Brassica oleracea L. var. capitata f. alba L.) assimilation area
- Author
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Baranauskis, Kęstutis, Bandzevičiūtė, Vilma, Samuolienė, Giedrė, Šabajevienė, Gintarė, Ulinskaitė, Raimonda, Sakalauskaitė, Jurga, and Duchovskis, Pavelas
- Subjects
Fotosintezė ,Pigmentai (biologija) ,Cabbage ,Pigments (biology) ,Photosynthesis ,Gūžiniai kopūstai - Abstract
Tyrimo tikslas buvo įvertinti gūžinių baltųjų kopūstų vidinių gūžės lapų įtaką pasėlių asimiliaciniam plotui, lapų indeksui bei fotosintezės produktyvumui nustatyti. Tyrimo objektu pasirinkti gūžiniai baltieji kopūstai (Brassica oleracea L. var. capitata f. alba L.). Gūžių lapuose nustatyti fotosintetiniai pigmentai bei fotosintezės intensyvumas. Sudaryta fotosintezės intensyvumo priklausomybės nuo gūžės lapo eiliškumo kreivė rodo, kad ir šviesūs, kopūsto gūžės viduje esantys lapai intensyviai fotosintetina. Nustatyta, kad jauniausiuose gūžės lapuose pigmentų yra sąlyginai daugiau negu gūžės viduryje. Chlorofilų a/b santykis link gūžės vidurio nuosekliai mažėja. Didžiausias bendro chlorofilų ir karotinoidų kiekio santykis esti centriniuose (jauniausiuose) gūžės lapuose, o mažiausias – viduriniuosiuose gūžės sluoksniuose. Baltųjų kopūstų gūžės fotosintezės / kvėpavimo balansas yra teigiamas, todėl, skaičiuojant augalo ar pasėlio asimiliacinį plotą, siūloma prie nesusuktų į gūžę lapų ploto pridėti dviejų viršutinių gūžės lapų plotą. The aim of this study was to evaluate a possible contribution of inner cabbage loaf leaves toward practical determination of real crop assimilation surface, leaf index and photosynthesis productivity. Brassica oleracea L. var. capitata f. alba L. was a subject of research. Amounts of photosynthetic pigments as well as photosynthesis intensity in fully controlled environment were measured. Obtained data show that inner colorless cabbage loaf leaves are capable to prosecute an active photosynthesis under essential conditions. In general, the photosynthesis / respiration balance of cabbage loaf is positive. Consequently, it is proposed to count in an area of a few surface leaves of cabbage loaf as well, if assimilation area of plant or crop field in terms of loaf-independed leaves is being determined.
- Published
- 2005
79. Response of radish growth parameters to anthropogenic factors
- Author
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Brazaitytė, Aušra, Sakalauskaitė, Jurga, Duchovskis, Pavelas, Juknys, Romualdas, Šikšnianienė, Jūratė Bronė, Lukatkin, Aleksandr S., Samuolienė, Giedrė, Ulinskaitė, Raimonda, Baranauskis, Kęstutis, Šabajevienė, Gintarė, Navarskaitė, Lijana, and Strakšas, Vilius
- Subjects
Ridikai--Augimas ,Plants--Effect of ozone on ,Radishes--Growth (plants) ,Kadmis ,Augalų auginimo terpė ,Augalai--Ozono poveikis ,Plant growing media ,Cadmium - Abstract
Darbo tikslas – ištirti substrato rūgštumo, kadmio jonų bei ozono poveikį ridikėlių augimui. Vegetaciniai bandymai atlikti 2004 m. LSDI Augalų fiziologijos laboratorijos fitotroniniame komplekse. Tirti ridikėliai (Raphanus sativus L.) Žara. Tirtos tokios minėtų antropogeninių veiksnių koncentracijos: H2SO4 – 0,5; 1; 2; 4; 8 ml/l H2O; 3CdSO4.8H2O – 0,05; 0,1; 0,5; 1; 3 mM; ozono – 120; 240; 360 µg m-3 (7h per dieną, 5 dienas per savaitę). Bandymo pabaigoje buvo išmatuotas augalų aukštis, suskaičiuoti lapai, nustatyta žalioji ir sausoji ridikėlių masė. Nustatyta, kad nedidelis substrato parūgštinimas teigiamai veikė ridikėlių augimo procesus ir tik esant pH 3 pastebėta šių procesų inhibicija. Kadmio jonai substrate bei troposferinis ozonas ridikėlių aplinkoje, net esant mažiausioms šių teršalų koncentracijoms, labai neigiamai veikia augalų augimo procesus. The object of the work was to investigate response of radish growth to impact of substratum acidity, cadmium ions and ozone. Investigations were carried out in chambers of phytotron complex, LIH. Radish (Raphanus sativus L.) Žara was used for investigations. Such concentrations of above-mentioned factors were studied: H2SO4 – 0,5; 1; 2; 4; 8 ml/l; 3CdSO4.8H2O – 0,05; 0,1; 0,5; 1; 3 mM; ozone – 120; 240; 360 µg m-3 (7h each day, 5 days per week). Day / night temperature was 21°C/17°C and photoperiod – 16 h. Height, number of leaves, fresh and dry mass of radish were determined in the end of treatment. It was established that inconsiderable acidification of substratum affected growth processes positively. Inhibition of these processes was noticed only at substratum pH 3. Cadmium ions in substratum and troposphere ozone very negatively affected growth processes of radish even at minimal concentrations of these pollutants.
- Published
- 2005
80. Obelų fotosintezės procesų ir vaisių kokybės pokyčiai taikant įvairias sodo veisimo ir priežiūros technologines priemones (Apžvalga).
- Author
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Laužikė, Kristina, Samuolienė, Giedrė, and Uselis, Nobertas
- Abstract
The purpose of intensive horticulture is to grow not only a large number but also a high-quality crop from the unit area. Rising low competitive tension between fruit trees can increase the synthesis of chlorophyll and carotenoids. With increasing competition leaf area and dry matter decrease, that may adversely affect the formation of flowers and fruit. However, by choosing rootstocks and applying pruning, it is possible to effectively increase the area of the fruit tree leaf, adjust the light penetration in to the crown and at the same time to increase the amount of dry matter. During the vegetation period, the amount of starch and sugars also change. During the fruit and buds' growth increase competition for carbohydrates which also may adversely affect the formation of new flower buds. Coming to autumn the amount of sugar is decreasing, the amount of accumulated starch is increasing. Efficient optimization of technological tools can control the activity of photosynthesis, thus maintaining a consistent and high-quality yield. A lot has been done to determine the individual parameters for different parameters, but it's important to combine everything and get the optimal results for both the plant and human beings. Therefore, the aim of this work is to review the research carried out in Lithuania and in the world related to the use of technological tools and the impact on apple photosynthesis processes, photosynthetic indicators and apple quality. [ABSTRACT FROM AUTHOR]
- Published
- 2018
81. Salotų fotosintezės efektyvumas ir atsakas į šviesos srauto kitimą.
- Author
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Kačiušis, Mantas and Samuolienė, Giedrė
- Abstract
Leaf lettuces are one of the most growing and using vegetables for food. Lettuces growing in closed environment systems under LED lightning and photosynthesis response is important to understand growing potential and status. The aim of this study - to explore different LED lightning intensity and increased red light (660 nm) intensity impact on green and red leaf lettuces (Lactuca sativa L.) 'Green Cos' and 'Red Cos' photosynthesis parameters. As light source five different lightning spectral combinations with various red light (660 nm) spectrum intensity three days before harvesting were chosen. All plants were grown under 200 μmol m-2s-1PPFD. 3 days before harvesting, in one of treatment all light components were increased until 300 μmol m-2s-1. In two of them only one red light 660 nm intensity was elevated from 132 μmol m-2s-1 until 188 μmol m-2s-1 for 16 or 24 hours photoperiod. In one of the treatment 300 m-2s-1 was maintained all growing time. Day and night temperature: 21 / 17 °C ± 2 °C, photoperiod - 16 hours. In this experiment was determined the most efficient light intensity for photosynthesis was carried out in both lettuces (Lactuca sativa L.) 'Green Cos' and 'Red Cos' at 300 μmol m-2s-1 with elevated all light components 3 days before harvesting. The increasing of LED lightning intensity before harvesting more influenced photosynthetic activity in red than green leaf lettuces. Increasing of red light (660 nm) intensity triggered photoinhibition and it caused significant reduction of photosynthesis intensity. [ABSTRACT FROM AUTHOR]
- Published
- 2018
82. Sėjos laiko ir tręšimo įtaka sėklai skirtų eraičinsvidrių (Festulolium) augimui ir fotosintezei
- Author
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Leliūnienė, Jolanta, primary, Samuolienė, Giedrė, additional, Klimas, Evaldas, additional, and Duchovskis, Pavelas, additional
- Published
- 2013
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83. THE EFFECT OF UV-A SUPPLEMENTAL LIGHTING ON ANTIOXIDANT PROPERTIES OF OCIMUM BASILICUM L. MICROGREENS IN GREENHOUSE.
- Author
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VAŠTAKAITĖ, Viktorija, VIRŠILĖ, Akvilė, BRAZAITYTĖ, Aušra, SAMUOLIENĖ, Giedrė, JANKAUSKIENĖ, Julė, SIRTAUTAS, Ramūnas, and DUCHOVSKIS, Pavelas
- Subjects
BASIL ,EFFECT of ultraviolet radiation on plants ,GREENHOUSES ,ANTIOXIDANTS ,ORGANIC light emitting diodes ,GREENHOUSE plants - Abstract
The effects of supplemental UV-A LED lighting on growth and antioxidant properties of two varieties of basil (Ocimum basilicum L.) microgreens were determined. Purple-leaf 'Dark Opal' and green-leaf 'Sweet Genovese' basils were grown in greenhouse (14 days, 22/18 ± 2 °C day/night temperature, 40 ± 5% a relative air humidity) during winter season. The main lighting system (HPS lamps and natural daylight) was supplemented with ~13.0 μmol m
-2 s-1 flux of UV-A 390 nm, and a total PPFD was ~125 μmol m-2 s-1 (16 h photoperiod) for 1 or 7 days before harvest, or entire growth period. 14 days. The results revealed that the influence of UV-A on growth and antioxidant properties depended on basil variety and duration of irradiation. Generally, UV-A irradiation for 7 days significantly (P ≤ 0.05) inhibited growth and hypocotyl elongation of green-leaf basils, and for 14 days of both basil varieties. No significant differences on leaf chlorophyll index were determined. However, leaf flavonol index significantly increased in green-leaf basils after 7 and 14 days UV-A irradiation. The total phenols ant anthocyanin contents significantly decreased after 1 day UV-A irradiation in purple-leaf basils, and the continuous decrease following UV-A irradiation for 7 or 14 days was determined. In addition, UV-A irradiation had negative effects on ABTS radical activity in purple-leaf basils; however, the significantly higher ABTS radical scavenging activity after UV-A irradiation for 1 or 7 days in green-leaf basils were determined. UV-A influenced higher ascorbic acid synthesis in purple-leaf basils after 7 days irradiation, or after 14 days irradiation in both basil varieties. In summary, the supplemental UV-A LED lighting allows to protect basil microgreens from hypocotyl elongation, and enhances antioxidant properties in green-leaf basils. Purple-leaf basils showed to be more sensitive to UV-A irradiation, and less positive effects on antioxidant properties were determined. [ABSTRACT FROM AUTHOR]- Published
- 2015
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84. LED illumination affects bioactive compounds in romaine baby leaf lettuce
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Samuolienė, Giedrė, primary, Brazaitytė, Aušra, additional, Sirtautas, Ramūnas, additional, Viršilė, Akvilė, additional, Sakalauskaitė, Jurga, additional, Sakalauskienė, Sandra, additional, and Duchovskis, Pavelas, additional
- Published
- 2013
- Full Text
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85. The influence of sowing time and fertilization on the assimilative leaf area formation of Festulolium
- Author
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Leliūnienė, Jolanta, primary, Klimas, Evaldas, additional, Samuolienė, Giedrė, additional, and Duchovskis, Pavelas, additional
- Published
- 2013
- Full Text
- View/download PDF
86. The effects of different UV-B radiation intensities on morphological and biochemical characteristics inOcimum basilicumL.
- Author
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Sakalauskaitė, Jurga, primary, Viskelis, Pranas, additional, Dambrauskienė, Edita, additional, Sakalauskienė, Sandra, additional, Samuolienė, Giedrė, additional, Brazaitytė, Aušra, additional, Duchovskis, Pavelas, additional, and Urbonavičienė, Dalia, additional
- Published
- 2012
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87. Šviesos spektro sudėties įtaka bulvių (Solanum tuberosum L.) stiebagumbių apikalinio dominavimo slopinimui
- Author
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JUKNEVIČIENĖ, Živilė, primary, SAMUOLIENĖ, Giedrė, additional, VIRŠILĖ, Akvilė, additional, DUCHOVSKIS, Pavelas, additional, and VENSKUTONIENĖ, Egidija, additional
- Published
- 2011
- Full Text
- View/download PDF
88. The impact of LED illumination on antioxidant properties of sprouted seeds
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Samuolienė, Giedrė, primary, Urbonavičiūtė, Akvilė, additional, Brazaitytė, Aušra, additional, Šabajevienė, Gintarė, additional, Sakalauskaitė, Jurga, additional, and Duchovskis, Pavelas, additional
- Published
- 2010
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89. Decrease in Nitrate Concentration in Leafy Vegetables Under a Solid-state Illuminator
- Author
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Samuolienė, Giedrė, primary, Urbonavičiūtė, Akvilė, additional, Duchovskis, Pavelas, additional, Bliznikas, Zenonas, additional, Vitta, Pranciškus, additional, and Žukauskas, Artūras, additional
- Published
- 2009
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90. The Effect of Red-LED Lighting on the Antioxidant Properties and Nitrates in Red Baby Leaf Lettuces.
- Author
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Sirtautas, Ramūnas and Samuolienė, Giedrė
- Subjects
- *
LIGHT emitting diodes , *ANTIOXIDANTS , *NITRATES , *LETTUCE research , *VITAMIN C , *PHENOLS - Abstract
We report on the application of 638-nm light-emitting diode (LED) treatment on three baby leaf lettuce (Lactuca sativa L., red leaf 'Multired 2' 'Multired 4' 'Solvano') varieties grown in closed controlled environment chambers. Day/night air temperature was maintained at 21ºC/17°C. Red 638 nm LED light was used for lettuce illumination with photosynthetic photon flux density (PPFD) of 150-160 µmol m-2 s-1. The effect of 18 and 24 h photoperiod was compared. Reference plants were grown under high pressure sodium lamp (HPS) illumination at the same light level and photoperiods. After harvesting, free-radical scavenging activity and the contents of phenolic compounds, ascorbic acid, alpha tocopherol and nitrates were evaluated. It was determinded, that red LED light and 24 h photoperiod effect for nitrate and antioxidant contents in red baby leaf lettuce is variety - dependant and proper lighting strategies should be selected seeking to cultivate lettuce with optimal nutritional properties. Red LED light and continuous illumination was beneficial for antioxidant and nitrate contents in 'Solvano' baby leaf lettuce. Light spectra and photoperiod are suitable tools seeking to create mild photostress for plants with the aim to enhance the contents of antioxidant phytochemicals. [ABSTRACT FROM AUTHOR]
- Published
- 2013
91. Photophysiological Investigations Using Light Emitting Diode Illumination.
- Author
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Urbonavičiūtė, Akvile, Duchovskis, Pavelas, Brazaitytė, Aušra, and Samuolienė, Giedrė
- Subjects
AGRICULTURAL technology ,HORTICULTURE ,PLANT photoinhibition ,LIGHT emitting diodes - Abstract
In this study we review the plant phtophysiological researches performed at Lithuanian institute of Horticulture, laboratory of plant physiology. The main directions of investigations - the effect of light parameters on plant morphogenesis, photosynthesis system, dynamics of productivity, metabolism - the indices, determining the vegetable yield and quality. The valuable results were attained exploring the application possibilites of solid state lighting, based on light emitting diode (LED) technology: cultivating plants with higher nutritional quality, higher productivity, accelerated development. In colaboration with the physicists of Institute of Material science and Applied Research (Vilnius University), the most succeeded results were patented, installed lighting modules in industrial greenhouses. [ABSTRACT FROM AUTHOR]
- Published
- 2009
92. LED irradiance level affects growth and nutritional quality of Brassica microgreens.
- Author
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Samuolienė, Giedrė, Brazaitytė, Aušra, Jankauskienė, Julė, Viršilė, Akvilė, Sirtautas, Ramūnas, Novičkovas, Algirdas, Sakalauskienė, Sandra, Sakalauskaitė, Jurga, and Duchovskis, Pavelas
- Abstract
This study examines the effect of irradiance level produced by solid-state light-emitting diodes (LEDs) on the growth, nutritional quality and antioxidant properties of Brassicaceae family microgreens. Kohlrabi ( Brassica oleracea var. gongylodes, 'Delicacy Purple') mustard ( Brassica juncea L., 'Red Lion'), red pak choi ( Brassica rapa var. chinensis, 'Rubi F') and tatsoi ( Brassica rapa var. rosularis) were grown using peat substrate in controlled-environment chambers until harvest time (10 days, 21/17°C, 16 h). A system of five lighting modules with 455, 638, 665 and 731 nm LEDs at a total photosynthetic photon flux densities (PPFD) of 545, 440, 330, 220 and 110 µmol ms respectively were used. Insufficient levels of photosynthetically active photon flux (110 µmol m s) suppressed normal growth and diminished the nutritional value of the Brassica microgreens studied. In general, the most suitable conditions for growth and nutritional quality of the microgreens was 330-440 µmol m s irradiation, which resulted in a larger leaf surface area, lower content of nitrates and higher total anthocyanins, total phenols and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free-radical scavenging capacity. High light levels (545 µmol m s), which was expected to induce mild photostress, had no significant positive impact for most of investigated parameters. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
93. The Response of Antioxidant System of Drought-Stressed Green Pea (Pisum sativum L.) Affected by Watering and Foliar Spray with Silica Nanoparticles.
- Author
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Sutulienė, Rūta, Ragelienė, Lina, Samuolienė, Giedrė, Brazaitytė, Aušra, Urbutis, Martynas, and Miliauskienė, Jurga
- Subjects
ANTIOXIDANTS ,DROUGHTS ,ABIOTIC stress ,SILICA nanoparticles ,PLANT growth - Abstract
Abiotic stress caused by drought impairs plant growth and reduces yields. This study aimed to investigate the impact of silica nanoparticles (SiO
2 NPs) through the adverse effects of drought on the growth, oxidative stress, and antioxidative response of pea 'Respect'. Pea plants were grown in a greenhouse before being watered (100 ± 1 mL per pot) or foliar sprayed (ca. 14 ± 0.5 mL plant−1 ) with suspensions containing SiO2 NPs (0, 12.5 ppm, 25 ppm, and 50 ppm) and were exposed to drought stress for 10 days. Drought stress was created by maintaining 30% of the soil moisture while the control was 80%. The growth parameters of pea grown under drought stress conditions were improved by spraying or watering plants with SiO2 NPs (12.5, 25, and 50 ppm). At drought stress, peas treated with SiO2 NPs (50 ppm) increased their relative water content by 29%, specific leaf area by 17%, and decreased root/shoot ratio by 4% as compared to plant non-treated with SiO2 NPs. In addition, spraying or watering of SiO2 NPs increased peas tolerance to drought by increasing the activity of antioxidant enzymes at least three times including catalase, ascorbate peroxidase, glutathione reductase, and superoxide dismutase, as well as reducing hydrogen peroxide and lipid peroxidation in plant tissue. It was observed the increase in total phenolic compounds and non-enzymatic antioxidant activity (DPPH, ABTS, FRAP) in peas treated with SiO2 NPs under drought stress. The physiological response of peas to drought and the effects of SiO2 NPs studied in this experiment based on the use of the concentration of 50 ppm nanoparticles can protect peas from the damaging effects of drought and could help reduce global food shortages. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
94. The effects of different UV-B radiation intensities on morphological and biochemical characteristics in Ocimum basilicum L.
- Author
-
Sakalauskaitė, Jurga, Viskelis, Pranas, Dambrauskienė, Edita, Sakalauskienė, Sandra, Samuolienė, Giedrė, Brazaitytė, Aušra, Duchovskis, Pavelas, and Urbonavičienė, Dalia
- Abstract
BACKGROUND: The effects of short-term ultraviolet B (UV-B) irradiation on sweet basil ( Ocimum basilicum L. cv. Cinnamon) plants at the 3-4 leaf pair and flowering stages were examined in controlled environment growth chambers. Plants were exposed to 0 (reference), 2 and 4 kJ UV-B m
−2 day−1 over 7 days. RESULTS: Exposure of basil plants to supplementary UV-B light resulted in increased assimilating leaf area, fresh biomass and dry biomass. Stimulation of physiological functions in young basil plants under either applied UV-B dose resulted in increased total chlorophyll content but no marked variation in carotenoid content. At the flowering stage the chlorophyll and carotenoid contents of basil were affected by supplementary UV-B radiation, decreasing with enhanced UV-B exposure. Both total antioxidant activity (2,2-diphenyl-1-picrylhydrazyl free radical assay) and total phenolic compound content were increased by UV-B light supplementation. Young and mature basil plants differed in their ascorbic acid content, which was dependent on UV-B dose and plant age. UV-B radiation resulted in decreased nitrate content in young basil plants (3-4 leaf pair stage). CONCLUSION: These results indicate that the application of short-exposure UV-B radiation beneficially influenced both growth parameters and biochemical constituents in young and mature basil plants. © 2012 Society of Chemical Industry [ABSTRACT FROM AUTHOR]- Published
- 2013
- Full Text
- View/download PDF
95. The impact of red and blue light-emitting diode illumination on radish physiological indices.
- Author
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Samuolienė, Giedrė, Sirtautas, Ramūnas, Brazaitytė, Aušra, Sakalauskaitė, Jurga, Sakalauskienė, Sandra, and Duchovskis, Pavelas
- Abstract
The objective was to evaluate the effect of different combinations of red (638 nm) and blue (455 nm) light produced by solid-state light-emitting diodes (LEDs) on physiological indices (net assimilation rate, hypocotyl-to-leaf ratio, leaf area, leaf dry weight, hypocotyl length and diameter, plant length, developed leaves), variation of photosynthetic pigments and non-structural carbohydrates in radish ( Raphanus sativus L., var. 'Faraon'). Lighting experiments were performed under controlled conditions (total PPFD - 200 μmol m s; 16 h photoperiod; 14/18°C night/day temperature). The LED conditions: 638 nm; 638 + 5% 455 nm; 638 + 10% 455 nm; 638 + 10% 455 + 731 nm; 638 + 10% 455 + 731 + 669 nm. Our results showed that radishes grown under red (638 nm) alone were elongated, and the formation of hypocotyl was weak. The net assimilation rate, hypocotyl-to-leaf ratio, and leaf dry weight also were low due to the low accumulation of photosynthetic pigments and non-structural carbohydrates in leaves. The supplemented blue (455 nm) light was necessary for the non-structural carbohydrates distribution between radish storage organs and leaves which resulted in hypocotyl thickening. Red alone (638 nm) or in combination with far-red (731 nm), or red669 for radish generative development was required. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
96. The impact of LED illumination on antioxidant properties of sprouted seeds.
- Author
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Samuolienė, Giedrė, Urbonavičiūtė, Akvilė, Brazaitytė, Aušra, Šabajevienė, Gintarė, Sakalauskaitė, Jurga, and Duchovskis, Pavelas
- Abstract
The objective of this study was to evaluate the effect of the light emitting diode (LED) spectra on the antioxidant properties of sprouted wheat ( Triticum aestivum L.), radish ( Raphanus sativus L.), and lentil ( Lens esculenta Moenh.) seeds. Lighting experiments were performed under controlled conditions (PPFD - 100 μmol m s; 12 h photoperiod; 27°C). The LED conditions used were: L1 - 638 nm; L2 - 455 nm, 638 nm, 669 nm, 731 nm (basal components); L3 - basal + 385 nm; L4 - basal + 510 nm and L5 - basal + 595 nm. Wheat and lentil sprouts were shown to accumulate less phenolic compounds and were more sensitive to light spectral differences when compared to radish sprouts. The antioxidant properties and contents of antioxidant compounds in seeds germinated in the dark were significantly lower than LED treated seeds. The higher content of total phenols and significant increase in alpha-tocopherol and vitamin C concentration resulted in altered DPPH free-radical scavenging capacity. Therefore we conclude that the LED spectra, based on basal components supplemented with green (510 nm) light can improve the antioxidant properties of sprouted seeds of lentil and wheat. The highest antioxidant properties of radish seeds were caused by radiation with supplemental amber (595 nm) light. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
97. Radish plant behaviour under short-term elevated ozone fumigation.
- Author
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Sakalauskaitė, Jurga, Brazaitytė, Aušra, Urbonavičiūtė, Akvilė, Samuolienė, Giedrė, Šabajevienė, Gintarė, Sakalauskienė, Sandra, and Duchovskis, Pavelas
- Abstract
Effects of short-term ozone (O) fumigation on radish ( Raphanus sativus L.) plants were examined in growth chambers under controlled environment conditions. Plants were exposed to 0 μg/m (reference), 80 μg/m, 160 μg/m and 240 μg/m O concentrations for 7 h per day for five days. Day/night temperature was 21°C/14°C and photoperiod 16 h. Chlorophyll content was evaluated spectrophotometrically. Chromatographic analysis of saccharides was also undertaken. The results showed that elevated O inhibited the growth of radish rhizocarps, net assimilation rate and biomass accumulation. O induced leaf desiccation, necrosis and premature senescence, but a typical reaction of plants to O stress was the rapid regeneration of new leaves. O inhibited accumulation of carotenoids more than chlorophylls. The higher photosynthetic pigment content in newly generated radish leaves may be regarded as an adaptation of the photosynthetic system to O. Leaf saccharide metabolism and incorporation depended on O concentration. Rapid regeneration of new leaves and increased content of photosynthetic pigments is the typical reaction of radish plants to O stress. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
98. Dumplūnių (Physalis L.) rūšių biologinių savybių ir cheminės sudėties palyginimas.
- Author
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Paulauskienė, Aurelija, Žebrauskienė, Audronė, Duchovskis, Pavelas, Samuolienė, Giedrė, and Tarasevičienė, Živilė
- Subjects
FRUIT composition ,PHYSALIS ,FRUIT harvesting ,VITAMIN C ,FRUCTOSE ,MALTOSE ,GLUCOSE ,SUCROSE - Abstract
Copyright of Agricultural Sciences / Zemès ukio Mokslai is the property of Lithuanian Academy of Sciences Publishers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2009
99. Effects of nitrogen fertilizers on wheat photosynthetic pigment and carbohydrate contents.
- Author
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Tranavičienė, Tatjana, Šikšnianienė, Jūratė B., Urbonavičiūtė, Akvilė, Vagusevičienė, Ilona, Samuolienė, Giedrė, Duchovskis, Pavelas, and Sliesaravičius, Algirdas
- Subjects
WINTER wheat ,NITROGEN fertilizers ,CHLOROPHYLL ,PHOTOSYNTHETIC pigments - Abstract
Copyright of Biologija is the property of Lithuanian Academy of Sciences Publishers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2007
100. Skirtingos šviesos spektro sudėties įtaka ridikėlių (Raphanus sativus L.) augimo parametrams ir pigmentų kiekiui lapuose.
- Author
-
Čeidaitė, Alina, Samuolienė, Giedrė, and Duchovskis, Pavelas
- Abstract
The experiments were carried out in the phytotron complex of Plant Physiology Laboratory of the Institute of Horticulture, Lithuanian Research Centre for Agriculture and Forestry. The objective of our studies was to investigate the influence of different light-emitting diode (LEDs) light on the radish growth and pigment (such as chlorophylls, carotenoids, flavonols) quantity. The research object was radish (Raphanus sativus L.) 'Faraon'. The radishes were grown in peat mixed with sand in the ratio of 3 : 1. 16 h photoperiod, 18/16 ± 2 C day/night temperature was maintained in phytotron chambers. The radishes were irradiated with red (R) 638 nm, blue (M) 447 nm, red (R669) 669 nm, far-red (TR) 731 nm, green (Ž) 518 nm and (UV) 390 nm LEDs light combinations (total PPFD -200 µmol m² s-1). Our results showed that the radishes were growing best under: R + M + R669 + TR, R + M + R669 + TR + UV, R + M + R669 + TR + Ž and R+M, while plants grown only under R light were elongated and did not form roots. The biggest radish root was formed at R + M + R669 + TR + UV and R + M + R669 + TR + Ž light. The significantly highest carotenoid content in the radishes was under R + M + R669 + UV light and these radishes had the significantly highest number of leaves. The significantly lower carotenoid content in the radish leaves was at R light treatment. The ratio of chlorophylls and flavonoids was significantly higher at R or R+M+TR light, and significantly lower at R + M, R + M + R669 + TR + UV and R + M + R669 + TR + Ž treatment. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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