Evaluation of Drought Tolerance Indices in Red Bean Lines

In other to evaluation of drought stress tolerance, 23 lines of red beans with tow cultivars (Yaghout and Ofogh), were studied in lattice design with two replications in both normal irrigation and drought stress at the Khomein Bean station in 2017. Drought stress applied after complete stability of each plant in third trifoliate leaflet stage. Changes of yield and yield components, grain yield in normal irrigation and drought stress and tolerance and susceptibility indices evaluated in the stages accomplished. Analysis of variance showed that a significant difference among lines are both irrigation. Drought stress reduced evaluated properties, significantly. Drought stress resulting in decreased the most of traits, so that maximum effect of drought stress-related traits were number of seeds plant-1 and yield. In normal condition the highest and the lowest grain yield (2541.7 and 841.6 Kg Ha-1, respectively) were observed in KS31338 and KS31352 line, respectively. In stress condition the highest and the lowest grain yield (1934.7 and 602.2 Kg Ha-1, respectively) were obtained in KS31336 and KS31357 line, respectively. Between stress tolerance indices the highest MP, GMP and STI belonged to KS31336 line and the lowest tolerance index and stress susceptibility index (SSI) were observed in KS31352 line respectively. Grain yield under normal irrigation conditions with grain yield under drought stress conditions and stress tolerance indices (TOL, MP, STI and GMP) had significant positive correlation. Based on the geometric mean of production and the susceptibility indexes, principal component analysis and biplot STI and GMP, KS31336, KS31253, KS31148, KS31337 tolerant to drought stress were identified.