Document Type : Original Article
Authors
1 Associate Prof. of Agronomy and Plant Breeding, Razi University, Kermanshah, Iran
2 MSc Student of Plant Breeding, Razi University, Kermanshah, Iran
3 Assistant Prof. Center of Research of Agriculture and Natural Resources, Kermanshah, Iran
Abstract
To evaluate the grain yield of fifteen rapeseed genotypes under drought stress using drought resistance indices, an experiment as a randomized complete block design with three replications was performed under irrigated and dryland farming conditions at the research farm of campus of Agriculture and Natural Resources of Razi University of Kermanshah over 2012-2013 cropping season. The sensitivity stress index, tolerance, harmonic mean, geometric mean of the average production, stress tolerance, yield and yield stability were calculated based on grain yield under two conditions. Combine analysis of variance showed that the environment significantly affected grain yield so that the average yield under irrigated environment was more than dryland farming. There was a significant difference between genotypes for grain yield and drought resistance indices under both conditions. Considering correlations of indices showed that MP, GMP and STI had significant correlation with grain yield in both conditions, and based on three-dimensional chart of these indices, genotypes HW113, L146 and L201 were superior genotypes for both conditions. According to the bi-plot of two first principal components, the genotypes HW113, L146 and L201 were the most tolerant to drought stress, and genotypes L72 and OPERA were the most susceptible genotypes to drought stress environment.
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