بررسی روند تغییرات عملکرد دانه گندم براساس صفات زراعی مهم در جمعیت حاصل از تلاقی روشن در سبلان

Abstract
In order to detect relationship between grain yield and some of the important agronomic traits, it was
investigated in pure inbreed lines in Roshan and Sabalan cross and assigned ratio of group of traits that have
more influence on grain yield and also detected direct and indirect effect between grain yield and its
components 135 lines with 5 control cultivars (Roshan, Sabalan, Mahdavi, Arta and Falat) based on
Augmented design, in field of Shahid Bahonar University of Kerman on growing season of 2012-2013.
grain yield had positive and meaningful correlation with two traits of biologic yield and harvest index and
negative and meaningful correlation with number total tillers and number of grain in plant and single plant
weight had the most correlation (0.90) together among traits. There are five traits in step by step of
regression: biologic yield, harvest index, total trills, number of grain in plant, and single plant weight which
totally justified 80 percent of grain yield changes. The first trait that entered in this model was biologic yield
justified the most yield changes. Due to the result of path analysis, biologic yield had the most direct effect
on grain yield(0.81) and the least indirect effect on this treat through number total trills on grain yield.
Regarding to the high correlation of biologic yield with grain yield and high direct effect and low in direct
effect on this trait can be used in breeding region for yield improvement.