Study of correlation among yield and yield components affecting traits onbread wheat under drought stress and non-stress conditions

摘要

In order to investigate affecting traits on yield and yield components, five wheat genotypes in a completely randomized block design with three replications were evaluated. The experiment was repeated in two normal irrigation and drought stress levels. In this experiment, traits such as tiller number, plant height, number of grains per spike, grain weight, and number of stomata in leaf, ash content and yield were investigated. Drought stress reduced the grain yield and its components in all genotypes. Average yield was significantly decreased under drought stress. MV17 genotype with an average of 102.40 kg per hectare got the maximum and Gaspard genotype with an average of 80.15 kg per hectare, got the minimum grain yield and also in drought conditions Azar2 genotype with an average of 79.10 kg per hectare got the maximum and with an Gaspard genotype with an average of 34.83 kilograms per hectare, got the minimum value among all studied genotypes. Analysis of grain yield correlation with its components demonstrated that in normal irrigation conditions, number of grains per spike and ash content was most correlated with grain yield, however, in drought stress conditions correlation between plant height and one thousands grain weight was a meaningful positive relation and number of stomata in leaf area had a meaningful negative relation. Therefore one can select the genotypes, in normal irrigation and stress condition, using traits which have high correlations with grain yield to improve the grain yield. Hence one can take plant height, grain weight and number of stomata in leaf as the criterion of superior genotype selection in end season draught tolerance.