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Morphological and Biochemical Responses of Common Bean (Phaseolus vulgaris L.) to PEG-Induced Drought Stress and Salicylic Acid Application
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DOI：10.18016/ksutarimdoga.vi.1738976.png)
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Abstract
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Common bean (Phaseolus vulgaris L.) is a major food source and an important legume worldwide, yet its production is significantly limited by abiotic stress factors, such as drought. This study investigated the effects of Polyethylene Glycol (PEG)-induced drought stress and salicylic acid (SA) application on the morphological and biochemical responses of this plant. To simulate drought conditions, plants were exposed to PEG6000 at osmotic potentials of -0.351 MPa and -0.75 MPa, and treated with 1 mM SA. Drought stress significantly reduced growth decreased seedling height by approximately 52% and relative water content (RWC) by 59% compared to the control group. Biochemically, this stress led to a 51% reduction in chlorophyll a content, while significantly increasing the levels of MDA and H2O2, the main indicators of oxidative stress, by 33% and 27%, respectively. In contrast, the SA application, both alone and in combination with PEG, induced drought stress, resulting in significant improvements in growth and chlorophyll content. For instance, the 1 mM SA application alleviated the reduction in seedling height by 30% and the loss in chlorophyll a by 40%. This protective effect was accompanied by a noticeable decrease in MDA and H2O2 levels. These findings demonstrate that SA effectively mitigates the adverse effects of drought stress on common bean, primarily by activating antioxidant defense mechanisms to manage oxidative stress. SA can thus be utilized as a promising tool to enhance drought resistance in plants.
Keywords:
Phaseolus vulgaris L
Salicylic acid
Drought stress
Polyethylene glycol (PEG)
Oxidative stress
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