مقاومت به خشكي و رابطه آن با عملكرد، سطح برگ و سرعت رشد در مرحله زايشي تعدادي از ژنوتيپ هاي گندم نان با زمينه متفاوت به نژادي

Drought resistance and its relation with yield, leaf area and crop growth rate during reproductive stage in bread wheat genotypes with different breeding background

In a field experiment, drought resistance and its relation with some of growth parameters in bread wheat genotypes of differential breeding background were investigated. A split plot arrangement of treatments (moisture regimes as main-plots and genotypes as sub-plots) based on compelet block design with four replications was employed. Water stress was imposed from late jointing. Significant differencees were detected between genotypes for grain yield and HI. Azadi and Qods followed by Roushan showed the highest grain yield and HI under both irrigation regimes, while the lowest ones were observed in lanraces. Based on drought resistance indices, Qods, Azadi and Roushan were considered as resistant, and most of landreces as sensetive to water stress. The superiority of yield and HI of improved varieties to landraces was revealed due to statisticaly comparision of the three bread wheat genotypes with different breeding backgrounds. Water stress reduced leaf area and crop growth rate. In this respect genotyp differences were statisticaly significant. Significant interaction effects of genotypes and irrigation regimes on leaf area were detected. There were not detected any relationship between this trait and drought resistance. Similar results were observed for Celt.