Asian Science
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Abstract: 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.