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Research Paper | December 1, 2012

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The role of exogenous salicylic acid (SA) on phytohormonal changes and drought tolerance in common bean (Phaseolus vulgaris L.)

O. Sadeghipour, P. Aghaei

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J. Bio. Env. Sci.2(12), 8-15, December 2012

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Abstract

Salicylic acid (SA) is an endogenous plant growth regulator of phenolic nature, which participates in the regulation of physiological processes in plants and also plays an important role in provoking plant resistance to various abiotic stresses. An experiment was therefore, conducted to evaluation the effect of exogenous application of SA on the changes of phytohormones and biomass of common bean under water stress conditions during 2011 in Iran. Seeds were soaked at various concentrations of SA (0, 0.25, 0.5, 0.75 and 1 mM) for 6 h. Then plants were subjected to normal and drought conditions. Drought decreased significantly endogenous auxin (IAA), gibberellic acid (GA3) and cytokinin (CK) levels while increased abscisic acid (ABA) content. Water stress also reduced biomass production. SA-pretreatment (especially 0.5 mM) enhanced IAA, GA3 and CK levels whereas decreased ABA content under both conditions and so improved biomass production. Results suggest that SA can alleviate the adverse effects of drought in common bean via changes in levels of endogenous plant hormones.

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The role of exogenous salicylic acid (SA) on phytohormonal changes and drought tolerance in common bean (Phaseolus vulgaris L.)

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