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5. Combined effect of hormonal priming and salt treatments on germination percentage and antioxidant activities in lettuce seedlings

Author

Nasri Nawel, Hannoufa Abdelali, Mahmoudi Hela, Abidi wissal, Ben Massoud Raouia, Huang Jun, Zargouni Hanen, Tarchoune Imen, Baatour Olfa, Ouerghi Zeineb, Zaghdoudi Maha, and Lachaâl Mokhtar

Subjects
Ascorbate, germination, hormonal priming, lettuce, salinity, biology, food and beverages, Priming (agriculture), Malondialdehyde, biology.organism_classification, Applied Microbiology and Biotechnology, Hypocotyl, chemistry.chemical_compound, Horticulture, Agronomy, chemistry, Catalase, Seedling, Germination, Genetics, biology.protein, Radicle, Agronomy and Crop Science, Molecular Biology, Gibberellic acid, Biotechnology
Abstract

Hormonal priming is a pre-sowing treatment that improves seed germination performance and stress tolerance. To understand the physiology of hormonal priming and its association with post priming stress tolerance, we investigated the effect of hormonal priming with increasing gibberellic acid (GA 3 ) concentrations (0, 3, 4.5 and 6 mM) on seedling growth and antioxidant system in lettuce. Germination percentage was higher in lettuce seedlings derived from primed seeds. Radicle and hypocotyl length and dry weight were reduced by salt treatment to a greater extent in non-primed than in primed seeds. Hormonal priming with 4.5 mM GA 3 induced the most dramatic decreases in electrolyte leakage (EL) and malondialdehyde (MDA) levels. NaCl increased catalase (CAT) activity in primed and non-primed seeds. The total ascorbate level remained constant in both primed and non-primed seeds under NaCl constraint. These results suggest that hormonal priming might have increased the salt tolerance of lettuce seeds through enhancing the activities of antioxidant enzymes and reducing the membrane damage as estimated using EL and MDA biomarkers. Key words: Ascorbate, germination, hormonal priming, lettuce, salinity.

Published
2012

8. Arabidopsis thalianaTolerates Iron Deficiency more than Thellungiella Salsugineaby Inducing Metabolic Changes at the Root Level

Author

Msilini, Najoua, Ferhi, Jihed, Chebbi, Mohamed, Lachaâl, Mokhtar, and Ouerghi, Zeineb

Abstract

Several studies have used A. thalianaas a model to identify the physiological and molecular mechanisms underlying iron deficiency tolerance in plants. Here, Arabidopsis thalianaand Thellungiella salsugineawere used to investigate the differential responses to iron deficiency of these two species. Plants were cultivated in hydroponic medium containing 5 or 0 μM Fe, for 10 days. Results showed that rosette biomass was more reduced in T. salsugineathan in A. thalianawhen grown on Fe-deficient medium. As a marker for iron deficiency tolerance, the induction of ferric chelate reductase (FCR) and phosphoenolpyruvate carboxylase (PEPC) activities was observed only in A. thalianaroots. In addition, we found that the accumulation of phenolic acids in roots of N1438 ecotype of A. thalianawas stimulated by Fe deficiency. Furthermore, an increase of flavonoids content in the root and exudates was observed under Fe-deficiency in this ecotype. Unlike other abiotic stresses, it appears that iron deficiency effects were more pronounced in Thellungiellathan in Arabidopsis. The higher tolerance of the Arabidopsisplant to iron deficiency may be due to the metabolic changes occurring in the roots.

Published
2015
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9. Effets de la fertilisation azotée, de l'inoculation par Rhizobium sp. et du régime des pluies sur la production de la biomasse et la teneur en azote du pois chiche.

Author

L'taief, Boulbaba, Sifi, Bouaziz, Zaman-Allah, Mainassara, Hajji, Mokhtar, and Lachaâl, Mokhtar

Subjects
RHIZOBIUM, PRECIPITATION (Chemistry), PLANT inoculation, NITROGEN fertilizers, BIOMASS, CHICKPEA
Abstract

Copyright of Biotechnologie, Agronomie, Societe et Environnement is the property of Les Presses Agronomiques de Gembloux 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

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