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Fayoum University (2021)

RESPONSE OF FABA BEAN PLANTS TO BEE HONEY AND GIBBERELLIC ACID UNDER DROUGHT STRESS CONDITIONS

BORIEK، SARA HAMDY KASSEM. 

Titre : RESPONSE OF FABA BEAN PLANTS TO BEE HONEY AND GIBBERELLIC ACID UNDER DROUGHT STRESS CONDITIONS

Auteur : BORIEK، SARA HAMDY KASSEM. 

Etablissement de soutenance : Fayoum University

Grade : Master of Science in Agricultural Science 2021

Résumé partiel
The use of growth regulators such as gibberellic acid (GA 3 ) and biostimulants, including diluted bee-honey (Db-H) can improve drought tolerance in many crops, including faba bean (Vicia faba L.). Db-H contains high values of osmoprotectants, mineral nutrients, vitamins, and many antioxidants making it an effective growth regulator against environmental stress effects. Therefore, the present study was planned to investigate the potential improvement in faba bean plant performance (growth and productivity) under full watering [100% of crop evapotranspiration (ETc)] and drought stress (60% of ETc) by foliar application of GA 3 (20 mg L -1 ) or Db-H (20 g L -1 ). The ameliorative impacts of these growth regulators on growth, productivity, physio-biochemical attributes, nutrient status, antioxidant defense system, and phytohormones were evaluated. GA 3 or Db-H attenuated the negative influences of drought stress on cell membrane stability, ion leakage, relative water content, nutrient status, leaf pigments related to photosynthesis (chlorophylls and carotenoids), and efficiency of the photosystem II (PSII in terms of F v /F m and performance index), thus improving faba bean growth, green pod yield, and water use efficiency. Drought stress caused an abnormal state nutrients and photosynthetic machinery due to increased indicators of oxidative stress [malondialdehyde (MDA), hydrogen peroxide (H 2 O 2 ) and superoxide (O 2 •− )], associated with increased osmoprotectants (proline, glycine betaine, soluble sugars, and soluble protein), non-enzymatic antioxidants (ascorbic acid, glutathione, and α-tocopherol), and enzymatic antioxidant activities (superoxide dismutase, catalase, glutathione reductase, and ascorbate peroxidase). However, foliar-applied GA 3 or Db-H mediated further increases in osmoprotectants, antioxidant capacity, GA 3 , indole-3-acetic acid, and cytokinins, along with decreased levels of MDA and abscisic acid. These results suggest the use of GA 3 or Db- H at the tested concentrations to mitigate drought-induced damage in faba bean plants to obtain satisfactory growth and productivity under a water deficit of up to 40%

Présentation étendue (EULC)

Page publiée le 8 mars 2022