Study of qualitative and quantitative traits in red bean in non-stress and drought conditions.

摘要

This study was conducted in order to evaluate the effect of water stress (limited irrigation) on different traits of bean. Fifteen bean genotypes were planted in a randomized complete block design with three replications under non-stress and drought stress conditions (24 traits were recorded). The results showed, the most decrease in the bean has been the plant yield. The results of step wise regression showed that the length of the longest pod and the number of pod per plant under non-stress condition and 100-seed weight, number of seed per plant and days of cotyledon leaves appearance under stress condition had the most effect on the yield. Since all of these traits showed us a considerable changes in yield, to study of direct and indirect effects these traits were used. Results analysis indicated a high direct affects of traits in non-stress conditions and there were no conspicuous indirect affects in these traits. Direct affects of 100-seed weight, seed number per bush in stress condition was very high, but indirect affects showed a weak consequence. As a result a direct selection is suggested for these traits. Direct affects of day's number till the leaves appearance was less considerable in compare with two previous traits and also indirect affects were unwanted. In resistance amount studying, indirect affects of tolerance's susceptibility and also traits changes percentage in stress conditions were measured. Geometric Mean Productivity (GMP), Stress Tolerance Index (STI) and Mean Productivity (MP) were the most suitable indicators for selecting drought resistant genotypes. Based on these indicators KS-31146 and KS-31150 in red beans, were found as resistant genotypes.