Srour, H. (2015). EXOGENOUS APPLICATION OF GLYCINEBETAINE IMPROVES ANTIOXIDANT SYSTEM IN GREEN BEAN (PHASEOLUS VULGARIS) SEEDLINGS UNDER SALINITY STRESS. test, 23(1), 111-119. doi: 10.21608/ajs.2015.14564
Hany A.M. Srour. "EXOGENOUS APPLICATION OF GLYCINEBETAINE IMPROVES ANTIOXIDANT SYSTEM IN GREEN BEAN (PHASEOLUS VULGARIS) SEEDLINGS UNDER SALINITY STRESS". test, 23, 1, 2015, 111-119. doi: 10.21608/ajs.2015.14564
Srour, H. (2015). 'EXOGENOUS APPLICATION OF GLYCINEBETAINE IMPROVES ANTIOXIDANT SYSTEM IN GREEN BEAN (PHASEOLUS VULGARIS) SEEDLINGS UNDER SALINITY STRESS', test, 23(1), pp. 111-119. doi: 10.21608/ajs.2015.14564
Srour, H. EXOGENOUS APPLICATION OF GLYCINEBETAINE IMPROVES ANTIOXIDANT SYSTEM IN GREEN BEAN (PHASEOLUS VULGARIS) SEEDLINGS UNDER SALINITY STRESS. test, 2015; 23(1): 111-119. doi: 10.21608/ajs.2015.14564

EXOGENOUS APPLICATION OF GLYCINEBETAINE IMPROVES ANTIOXIDANT SYSTEM IN GREEN BEAN (PHASEOLUS VULGARIS) SEEDLINGS UNDER SALINITY STRESS

Arab Universities Journal of Agricultural Sciences
Article 10, Volume 23, Issue 1, March 2015, Pages 111-119    PDF (494.88 K)
Document Type: Original Article
DOI: 10.21608/ajs.2015.14564
Author
Hany A.M. Srour*
Biochemistry Department, Faculty of Agriculture, Ain Shams University, 68 Hadayek Shoubra, PO box 11241 Cairo, Egypt
Abstract
Salt stresses collectively are responsible for many crop losses worldwide especially salt -sensitive plants. The present study investigates the roles of exogenous application of glycinebetaine (GB, 5mM) in improving salt stress tolerance in salt sensitive green bean seedlings. Salt stresses (45mM NaCl for one week) significantly reduced leaf relative water (RWC) and chlorophyll (chl) content and increased percentage of electrolyte leakage, endogenous Proline and lipid peroxidation. Activities of peroxidase(PX), ascorbate peroxidae (APX), superoxide dismutase (SOD), and catalase (CAT), were significantly increased in shoots and roots of green bean seedlings subjected to salt stress. Exogenous application of GB improves salt tolerance of green been seedlings as shown by increased  RWC and chlorophyll contents in leaves and reduced percentage of electrolyte leakage,  lipid peroxidation and proline content. Under salinity stress condition, GB application decreased the activities of PX, CAT, APX and SOD in seedling shoots, whereas, it increased the activities of CAT and AP in roots. The result suggests that exogenous application of GB increased green bean seedlings' tolerance to salt-induced oxidative damage by upregulating their antioxidant defense system where this compatible solute protect plant cell against salinity stress.
Keywords
salinity stress; glycine betaine; Phasolus val-garus; Antioxidant defensive enzymes
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