Abstract:
In current study, 14
genotypes of bread wheat chosen by
breeding tests in Zanjan Agricultural
Research Institute of Iran were exposed to
two experiment under irrigation and late
season drought stress. The experiments were
conducted between 2012-2013 in a
randomized complete block design with
three replications. Analysis of variance
showed that, under non-stress condition, the
differences among genotypes were
significant regarding biological yield and
grain weight per spike, while under stress
condition in addition there were significant
differences about grain yield and biological
yield at pollination stage. Under normal and
stress condition, the highest and the lowest
biological yield was observed in genotype 3
(52.6 g per 15 stems), genotype 2 (35 g per
15 stems), respectively. The average weight
of grain per spike decreased by 44.38 %
under drought stress condition. In flag leaf
removal experiment, results showed that the
genotypes significantly differed under nonstress
condition regarding the spike weight,
grain weight per spike and weight of the
leaves, except flag leaf, while under stress
condition there were significant differences
among genotypes in terms of biological
yield, spike weight, peduncle weight at
pollination stage, grain weight pre spike and
weight of the leaves, except flag leaf. In
leaves defoliation (except flag leaf), results
showed that the differences among
genotypes under normal and stress condition
regarding spike weight, grain number per
spike, biological yield, peduncle weight, and
flag leaf weight were significant.
