Abstract:
In order to evaluate several
agro-morphological traits in 21 spring bread
wheat genotypes, an experiment based on
randomized complete block design with
three replications was carried out in two
locations during three years (2008-
2011).The traits including grain yield(GY),
biological yield (BY), spike weight (SW),
grain weight per spike(GWS), harvest index
(HI), spike length (SL), spikelet per spike
(SPS), number of grain per spike (NGS),
number of spike per square meter (SPM),
1000-grain weight (GW), plant height (PH),
stem straw weight (SSW), spike straw
weight (SRW) were evaluated. The result of
combined analysis of variance revealed that
years, genotypes and their interaction effects
were significant for all the traits. Location
had significant difference for all the traits
except SL and SPS. GY was significant
correlated with BY (0.72**), SW (0.75**),
GWS (0.69**), NGS (0.59**), SSW
(0.62**) and SRW (0.66**). Factor analysis
was used for understanding the data
structure and trait relations. The factor
analysis divided the thirteen traits into three
factors. The cumulative variation for these
factors was 0.76 and also it’s portions for
factor one to three were 0.59, 0.16 and 0.06,
respectively. In the first factor, the traits
including GY, BY, SW, GWS, SPS, NGS
and SSW had high factor loadings. The
traits compromise HI, SSW and SRW had
high factor loadings in second factor and
also SPM, GW and PH had high values of
factor loadings in third factor. The
genotypes including Morvarid, N-80-19 and
N-85-14 had high mean values of grain
yield. The genotypes had high genetic
coefficient variation for SRW, BY, SW and
GY, therefore the efficiency of selection of
the genotypes for improving these traits will
be high.
