Abstract

In order to determine the relationship between grain yield and some physiological and morphological traits in bread wheat cultivars in south Kerman region and to determine the contribution of those traits that have the greatest effect on grain yield as well as direct study of grain yield with its components, a study was conducted on four wheat cultivars with the highest wheat cultivars in the region and each cultivar of 10 fields was planted in 2016–17. The results of correlation showed that in all fields of the cultivars grain yield was positively and significantly correlated with plant height, awn length, spike length, number of seeds per spike, spike weight, number of stems per square metre, straw yield and biological yield. The highest positive correlation coefficient was related to the biological yield trait (0.88). In stepwise regression, the first variable was introduced into the model and alone (53.9%) explained the higher percentage of grain yield changes. The results of this study indicated that characteristics such as number of stems per square metre, number of seeds per spike, spike weight, 1000-grain weight and stem height as criteria for selection for improving grain yield in wheat were introduced.