Physiological responses of two cultivars of G- 17 and Almas beans under water deficiency stress

Among beans, Phaseolus vulgaris L. with 18-22 percent of the protein and annual production of more than 20 million tons is the world s first. Drought is one of the most important environmental stresses that limit the production of plant products around the world. On average, more than 50 percent of the yield of many plant products is reduced due to drought stress. In this research, the effects of drought stress on some physiological traits of two bean cultivars (G-17 and Almas) in three levels of water stress (30, 60 and 100 (control)) of field capacity in a factorial arrangement and a completely randomized design with three replications. The results showed that the studied physiological traits such as leaf relative water content (RWC) and photosynthetic pigments were significantly reduced by drought stress (p≤ 0.05). Almas cultivar compared to G-17, apparently through the application of different mechanisms of drought tolerance was less subjected to drought stress, so that in Almas cultivar, proline, total carbohydrate, and MDA increased significantly under drought stress. Therefore, it can be concluded that the Almas cultivar is more tolerant than G_17 under drought conditions

کلیدواژه ها:

Bean ، Drought stress ، Physiological response