ارزيابي برخي صفات مورفولوژيك به عنوان معيارهاي انتخاب در اصلاح گندم

Evaluation of some morphological traits as selection criteria for improvement of bread wheat

In order to evaluate and determine the most effective traits for improvement of grain yield in bread wheat genotypes, an experiment was conducted with 567 genotypes. The experiment was conducted using augmented with two replications in which cv. Karadj 1 and cv. Sardari were used as control. Analysis of variance indicated non-significant difference between blocks for all the traits. Results of correlation analysis showed that majority of the traits had positive and significant correlation with single plant kernel yield. Step-wise regression analysis indicated that seven traits (spike grain yield, biological yield, harvest index, 1000 kernel weight, grain no./plant, grain no./spike and spike length) entered to the model and estimated 99% of grain yield varation in plant. Path analysis determined that grain no./plant, biological yield and 1000 kernel weight had the most positive direct effect on plant grain yield. Therefore, results indicated that indirect selection for these traits under irrigation condition will lead to improvement in plant grain yield .