بررسی روابط همبستگی، رگرسیون و علیت صفات مورفولوژیک درلاینهای اینبرد گندم نان

In order to determine the relationship between different traits and grain yield, this study was conducted
Seventy- six recombinant inbred lines based on randomized complete block design with two replications at
the agricultural research farm of Shahid Bahonar University of Kerman, Iran in 2011-2012. In this
experiment, eighteen traits were measured. The results of correlation coefficients revealed that grain yield
was positively and significant correlated with majority of the yield components. To remove the effect of noncontributing
traits or less influence on grain yield in regression model, stepwise regression was used.
Stepwise regression analysis indicated that 88% of the variation explained by fertile tillers, grain weight per
main spike, number of grains per spike and number of grains per plant, respectively. Path coefficients
analysis showed that number of fertile tillers (0.62) and grain weight per main spike (0.5) had the highest
direct effects on grain yield. These traits through the total number of grain per plant were applied indirect
and positive effect on grain yield. Therefore, these traits are as indirect selection criteria for improving grain
yield in bread wheat lines especially in the early generations of breeding programs.