10 results on '"Viršilė, Akvilė"'
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2. Response of Mustard Microgreens to Different Wavelengths and Durations of UV-A LEDs.
- Author
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Brazaitytė, Aušra, Viršilė, Akvilė, Samuolienė, Giedrė, Vaštakaitė-Kairienė, Viktorija, Jankauskienė, Julė, Miliauskienė, Jurga, Novičkovas, Algirdas, and Duchovskis, Pavelas
- Subjects
BRASSICA juncea ,CAROTENOIDS ,LUTEIN ,MUSTARD ,WAVELENGTHS ,PHOTON flux ,ACTINIC flux ,LEAF area - Abstract
Ultraviolet A (UV-A) light-emitting diodes (LEDs) could serve as an effective tool for improving the content of health-promoting bioactive compounds in plants in controlled-environment agriculture (CEA) systems. The goal of this study was to investigate the effects of UV-A LEDs at different wavelengths (366, 390, and 402 nm) and durations (10 and 16 h) on the growth and phytochemical contents of mustard microgreens (Brassica juncea L. cv. "Red Lion"), when used as supplemental light to the main LED lighting system (with peak wavelengths of 447, 638, 665, and 731 nm). Plants were grown for 10 days under a total photon flux density (TPFD) of 300 µmol m
−2 s−1 and 16-h light/8-h dark period. Different UV-A wavelengths and irradiance durations had varied effects on mustard microgreens. Supplemental UV-A radiation did not affect biomass accumulation; however, the longest UV-A wavelength (402 nm) increased the leaf area of mustard microgreens, regardless of the duration of irradiance. The concentration of the total phenolic content and α-tocopherol mostly increased under 402-nm UV-A, while that of nitrates increased under 366- and 390-nm UV-A at both radiance durations. The contents of lutein/zeaxanthin and β-carotene increased in response to the shortest UV-A wavelength (366 nm) at 10-h irradiance as well as longer UV-A wavelength (390 nm) at 16 h irradiance. The most positive effect on the accumulation of mineral elements, except iron, was observed under longer UV-A wavelengths at 16-h irradiance. Overall, these results suggest that properly composed UV-A LED parameters in LED lighting systems could improve the nutritional quality of mustard microgreens, without causing any adverse effects on plant growth. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
3. Effects of germination time on the antioxidant properties of edible seeds.
- Author
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Tarasevičienė, Živilė, Viršilė, Akvilė, Danilčenko, Honorata, Duchovskis, Pavelas, Paulauskienė, Aurelija, and Gajewski, Marek
- Subjects
- *
RADISHES , *SEEDS , *BROCCOLI , *SUNFLOWER seeds , *GERMINATION , *WHEAT seeds , *ANTIOXIDANTS - Abstract
The aim of this study was to determine the level of antioxidants in the seeds of wheat, lentil, pea, radish, broccoli, alfalfa, sunflower and amaranth germinated for 24, 72 and 120 hours. Following germination, the highest increases in the total phenols corresponded to 5.39, 4.62 and 2.20 times in broccoli, radish and alfalfa seeds respectively. The 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity was higher after germination for 120 hours in all the seed types as compared with the non-germinated seeds. In radish, sunflower and alfalfa seeds, the ability to scavenge ABTS increased by 5.19, 1.34 and 2.90 times respectively, after germination. According to the different changes in the amounts of tocopherol isomers in germinating seeds can be summarized, that the α-tocopherol content increased and that of β-, γ-, δ-tocopherol decreased irrespective of the species, therefore suitable for germination time and seeds variety allows having products with a high nutritional and antioxidant properties. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
4. Fotofiziologiniai efektai metabolitų dinamikai žalumyninėse daržovėse ir želmenyse
- Author
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Viršilė, Akvilė, Duchovskis, Pavelas, Šlepetienė, Alvyra, Pauža, Dainius H., Dabkevičius, Zenonas, and Aleksandras Stulginskis University
- Subjects
Nitrates ,Šviesą emituojantys diodai ,Antioksidantantai ,Nitratai ,Agronomy ,Light emitting diodes ,Antioxidants - Abstract
Tyrimų tikslas. Ištirti kietakūnio apšvietimo, pagrįsto šviesą emituojančių diodų technologija, panaudojimo galimybes žalumyninių daržovių, želmenų ir daigintų sėklų vidinės kokybės rodikliams valdyti. Mokslinis naujumas. Pirmą kartą nustatyta, kad raudona 638 nm šviesa ir jos derinys su raudona 669 nm, mėlyna 447 nm ir tolimąja raudona 731 nm šviesa paskatina nitratų redukcijos procesus salotose ir kitose žalumyninėse daržovėse. Nustatyta, kad reikšmingam teigiamam efektui žalumyninių daržovių vidinei kokybei pasiekti pakanka jas švitinti didelio tankio fotosintetiškai aktyvios raudonos 638 nm spinduliuotės srautu ~72 h prieš planuojamą derliaus nuėmimą. Pirmą kartą įvertintas kietakūnio apšvietimo spektro efektas skirtingų lietuviškų javų želmenų, lapinių ridikėlių ir daigintų sėklų antioksidacinėms savybėms. Nustatytas teigiamas raudonų 638, 669 nm, mėlynos 447 nm ir tolimosios raudonos 731 nm bangų ilgių deriniui papildomų žalios 518 nm ir geltonos 595 nm šviesos efektas natūraliai aukštomis bioaktyvių medžiagų koncentracijomis audiniuose išsiskiriančių žalumyninių daržovių ir želmenų antioksidacinėms savybėms. Darbo praktinė svarba. Įvertintos originalios konstrukcijos kietakūnio apšvietimo įrenginių taikymo žalumyninių daržovių vidinei kokybei gerinti galimybės. Remiantis darbe nustatytais dėsningumais, parengtas ir patentuotas žalingų nitratų kiekio augaluose sumažinimo, apšvitinant kietakūnio šviestuvo sukuriamu šviesos srautu, metodas ir įrenginys. Atliktų tyrimų... [toliau žr. visą tekstą] The aim of the research was to investigate the usability of the solid state lighting, based on light emitting diode technology, for the management of nutritional quality indices in green vegetables and sprouts. Scientific originality. It was determined for the first time, that red 638 nm light and its combination with blue 447 nm, red 669 nm and far red 731 nm light promoted nitrate reduction processes in lettuce and other green vegetables. It is enough to irradiate green vegetables with the high flux of photosyntheticaly active 638 nm red light for ~72 h before harvesting for the pronounced positive effect on their internal quality. The effect of the solid-state lighting spectra on antioxidant properties of Lithuanian cereal greens, leafy radish and sprouted seeds was evaluated for the first time. The positive effect of green 518 nm and yellow 595 nm light, supplemental for the red 638, 669 nm light, blue 447 nm and far red 731 nm light on the antioxidant properties of green vegetables and sprouts, naturally containing higher concentrations of bioactive compounds, was determined. Practical value of the work. Solid-state lighting application possibilities for the improvement of green vegetable internal quality were evaluated. According to defined trends, the method and apparatus for the reduction of harmful nitrates in plants, when irradiating plants with the light flux generated by semiconductor lighting unit, was designed and patented. The complex investigations and... [to full text]
- Published
- 2012
5. Photophysiological effects on the metabolite dynamics in green vegetables and sprouts
- Author
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Viršilė, Akvilė, Duchovskis, Pavelas, Šlepetienė, Alvyra, Pauža, Dainius H., Dabkevičius, Zenonas, and Aleksandras Stulginskis University
- Subjects
Nitrates ,Šviesą emituojantys diodai ,Antioksidantantai ,Nitratai ,Agronomy ,Light emitting diodes ,Antioxidants - Abstract
Tyrimų tikslas. Ištirti kietakūnio apšvietimo, pagrįsto šviesą emituojančių diodų technologija, panaudojimo galimybes žalumyninių daržovių, želmenų ir daigintų sėklų vidinės kokybės rodikliams valdyti. Mokslinis naujumas. Pirmą kartą nustatyta, kad raudona 638 nm šviesa ir jos derinys su raudona 669 nm, mėlyna 447 nm ir tolimąja raudona 731 nm šviesa paskatina nitratų redukcijos procesus salotose ir kitose žalumyninėse daržovėse. Nustatyta, kad reikšmingam teigiamam efektui žalumyninių daržovių vidinei kokybei pasiekti pakanka jas švitinti didelio tankio fotosintetiškai aktyvios raudonos 638 nm spinduliuotės srautu ~72 h prieš planuojamą derliaus nuėmimą. Pirmą kartą įvertintas kietakūnio apšvietimo spektro efektas skirtingų lietuviškų javų želmenų, lapinių ridikėlių ir daigintų sėklų antioksidacinėms savybėms. Nustatytas teigiamas raudonų 638, 669 nm, mėlynos 447 nm ir tolimosios raudonos 731 nm bangų ilgių deriniui papildomų žalios 518 nm ir geltonos 595 nm šviesos efektas natūraliai aukštomis bioaktyvių medžiagų koncentracijomis audiniuose išsiskiriančių žalumyninių daržovių ir želmenų antioksidacinėms savybėms. Darbo praktinė svarba. Įvertintos originalios konstrukcijos kietakūnio apšvietimo įrenginių taikymo žalumyninių daržovių vidinei kokybei gerinti galimybės. Remiantis darbe nustatytais dėsningumais, parengtas ir patentuotas žalingų nitratų kiekio augaluose sumažinimo, apšvitinant kietakūnio šviestuvo sukuriamu šviesos srautu, metodas ir įrenginys. Atliktų tyrimų... [toliau žr. visą tekstą] The aim of the research was to investigate the usability of the solid state lighting, based on light emitting diode technology, for the management of nutritional quality indices in green vegetables and sprouts. Scientific originality. It was determined for the first time, that red 638 nm light and its combination with blue 447 nm, red 669 nm and far red 731 nm light promoted nitrate reduction processes in lettuce and other green vegetables. It is enough to irradiate green vegetables with the high flux of photosyntheticaly active 638 nm red light for ~72 h before harvesting for the pronounced positive effect on their internal quality. The effect of the solid-state lighting spectra on antioxidant properties of Lithuanian cereal greens, leafy radish and sprouted seeds was evaluated for the first time. The positive effect of green 518 nm and yellow 595 nm light, supplemental for the red 638, 669 nm light, blue 447 nm and far red 731 nm light on the antioxidant properties of green vegetables and sprouts, naturally containing higher concentrations of bioactive compounds, was determined. Practical value of the work. Solid-state lighting application possibilities for the improvement of green vegetable internal quality were evaluated. According to defined trends, the method and apparatus for the reduction of harmful nitrates in plants, when irradiating plants with the light flux generated by semiconductor lighting unit, was designed and patented. The complex investigations and... [to full text]
- Published
- 2012
6. Red Light-Dose or Wavelength-Dependent Photoresponse of Antioxidants in Herb Microgreens.
- Author
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Samuolienė, Giedė, Brazaitytė, Aušra, Viršilė, Akvilė, Jankauskienė, Julė, Sakalauskienė, Sandra, and Duchovskis, Pavelas
- Subjects
HERBS ,ANTIOXIDANTS ,LIGHT emitting diodes ,BASIL ,PARSLEY ,WAVELENGTHS - Abstract
The purpose of this study was to evaluate the role of 638-nm and 665-nm LEDs on changes of antioxidants of basil (Ocimum basilicum) and parsley (Petroselinum crispum), and to assess the effect of light quality on antioxidative status. Plants were grown in peat substrate for 19 days (21/17 ±2°C, 16 h). Experiments were performed in (I) a controlled-environment: B
455 ,R638 ,R665 ,FR731 (control); B455 ,R*638 ,R665 ,FR731 ; B455 ,R638 ,R*665 ,FR731 ; R638 ; R665 (B–blue, R- red, FR–far-red light). PPFD was set from 231 during growth, upto 300 μmol m-2 s-1 during 3-day treatment changing R638 or R665 PPFD level; in (II) greenhouse (November): high-pressure sodium lamps (HPS) (control—300 μmol m−2 s−1 ); and HPS + 638 (HPS generated 90 and red LEDs—210 μmol m−2 s−1 ). In general, under supplemental or increased red 638 nm light, amounts of tested antioxidants were greater in basil, whereas sole 665 nm or sole 638 nm is more favourable for parsley. Increased or supplemental red light significantly increased contents of phenolics, α-tocopherol, ascorbic acid and DPPH• but suppressed accumulation of lutein and β-carotene in basil, whereas an increase of β-carotene and DPPH• was observed in parsley. Hereby, the photoresponse of antioxidant compounds suggests that photoprotective mechanism is stimulated by both light-dose-dependent and wavelength-dependent reactions. [ABSTRACT FROM AUTHOR]- Published
- 2016
- Full Text
- View/download PDF
7. 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
- Full Text
- View/download PDF
8. Light Irradiance Level for Optimal Growth and Nutrient Contents in Borage Microgreens.
- Author
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Viršilė, Akvilė and Sirtautas, Ramūnas
- Subjects
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BORAGE , *LIGHT emitting diodes , *PHOTOSYNTHESIS , *HYPOCOTYLS , *ANTIOXIDANTS , *NITRATES - Abstract
In this study we used the combination red (638, 665 nm), blue (445 nm) and far red (735 nm) light-emitting diodes (LEDs) to obtain the different light irradiance photosynthetic photon flux densities (PPFDs) of uniform spectra and investigated the effects of different light irradiance levels (110-545 µmol m-2s-1) on growth and nutrient contents in borage (Borago officinalis L.) microgreens cultivated in closed controlled environment chambers (21/17°C, 16 h photoperiod). The results showed that fresh weight, leaf area increased and hypocotyls length decreased with increasing PPFD from 110 to 440 µmol m-2s-1; when the highest investigated PPFD level of 545 µmol m-2s-1 resulted in inhibited biomass growth and undesired hypocotyl elongation. The lowest nitrate contents were determined in microgreens cultivated under moderate, 330-440 µmol m-2s-1 irradiance levels. 440 µmol m-2s-1 PPFD level evoked the response of protective antioxidant system and resulted in the highest contents of the main antioxidant phytochemicals, when 545 µmol m-2s-1 PPFD level suppressed antioxidant levels in borage microgreens. Our results implied that, compared to other light irradiance treatments, 440 µmol m-2s-1 was more suitable for borage microgreens cultivation. [ABSTRACT FROM AUTHOR]
- Published
- 2013
9. 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
10. THE EFFECT OF BLUE LIGHT DOSAGE ON GROWTH AND ANTIOXIDANT PROPERTIES OF BRASSICACEAE MICROGREENS.
- Author
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VAŠTAKAITĖ, Viktorija, VIRŠILĖ, Akvilė, BRAZAITYTĖ, Aušra, SAMUOLIENĖ, Giedrė, JANKAUSKIENĖ, Julė, SIRTAUTAS, Ramūnas, NOVIČKOVAS, Algirdas, DABAŠINSKAS, Laurynas, SAKALAUSKIENĖ, Sandra, MILIAUSKIENĖ, Jurga, and DUCHOVSKIS, Pavelas
- Subjects
- *
BLUE light emitting diodes , *PLANT growth , *BRASSICACEAE - Abstract
Light-emitting diodes (LEDs) are an efficient light source for plant growth and development, and can be easily controlled in artificial growing environments. The impact of blue LED light intensity on plant growth parameters and antioxidant capacity of red pak choi (Brassica rapa var. chinensis 'Rubi F1'), tatsoi (Brassica rapa var. rosularis) and mustard (Brassica juncea L. 'Red Lion') microgreens were investigated. Plants were cultivated within 16-h photoperiod, 21±2/ 17±2 °C (day/night), 50-60 % relative humidity in growth chamber for 10 days after sowing. Total photosynthetic photon flux density (PPFD) was ~300 µmol m-2 s-1. Five dosages of blue (447 nm; 0, 25, 50, 75, 100 µmol m-2 s-1) in combination with red (638 nm; 665 nm) and far red (731 nm) LEDs were tested. Results showed that microgreens treated without blue light were significantly elongated than plants treated with ~50-75 µmol m-2 s-1 blue light dosages. The effect of blue light on antioxidant properties differed depending on microgreens species. The small addition (~25 µmol m-2 s-1 ) of blue light was more suitable for higher contents of total phenols in mustard and red pak choi microgreens, and ascorbic acid synthesis in tatsoi. The ~75 µmol m-2 s-1 blue light dosage resulted in significantly higher DPPH free radical -- scavenging activity and total anthocyanins contents in red pak choi and tatsoi microgreens, respectively. The highest blue light dosage (~100 µmol m-2 s-1) led to significantly increased accumulation of total phenols in tatsoi. These results showed that supplemental blue light can be strategically used to enhance the nutritional value and inhibit elongation of microgreens. Targeted management of the blue light irradiance in combination with other LEDs may lead to maximized plant production and nutritional quality of young green vegetables grown in controlled environments. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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