Drought tension is one of the important factors influencing the yield and living conditions of most crops such as mung bean. Therefore, the investigation drought tolerance traits can help identify and select more tolerant cultivars. The present experiment was carried out as factorial in a completely randomized design with three replications, or at three levels of irrigation 40, 60 and 80 percent crop capacity and five cultivars and lines of Uzbek, Pareto, Hindi, A73-726 lines and B73-726 mung bean in greenhouse culture conditions. The results showed that drought had a significant effect at a probability level of one percent on pod number per plant, plant weight, number of main branches, leaf area, root dry weight and root diameter. With the increasing intensity of drought, the rate of photosynthesis, transpiration rate, photochemical quantum yield, relative water content of leaf, carotenoid, chlorophyll a and b, total chlorophyll content of leaves and the ratio of a to b chlorophyll decreased, while the amount of leaf proline increased significantly (p≤0/01). Also, there was a significant difference in these traits among the cultivars, a 73-726 line had a higher rate photosynthesis, the relative water content of leaf, carotenoid, proline, chlorophyll a and b, total chlorophyll content of leaf and the ratio of a to b chlorophyll than the other examined cultivars and lines in the present experiment. |
