Evaluation of Seed Yield, Yield Components and Tolerance to Drought Stress of Spring Canola Genotypes

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Abstract

To evaluate seed yield, yield components and tolerance to drought stress in 17 spring canola genotypes, two separate experiments were conducted in a randomized complete block design with three replications in two cropping seasons 2008-2010. Irrigation was applied in non stress experiment from planting to physiologic ripening, based on 50 percent and in stress experiment, based on 80 percent depletion of available soil water. Results of combined analysis of variance in two environments showed significant differences among genotypes for seed yield and drought stress indices. Irrigation in 80 percent depletion of available soil water significanty decreased seed yield and yield related traits. In non stressed condition, seed yield, of genotypes 15/1GOL×19H, 39/2FUS×RC, Zabol-6, SG2-87182 and 13/1RG×19H were 3147, 2838, 2831, 2789 and 2779 kgha-1 respectively and in stressed condition genotypes 13/RG×19H, 15/1GOL×19H, SG1-87182 and Zabol-15 with 2596, 2218, 2110 and 2077 kgha-1 produced higher seed yield. Genotypes 15/1GOL×19H, 13/1RG×19 H, and Zabol-6 with the highest seed yield and values of STI, GMP and MP indices were determined as tolerant genotypes to drought stress. Biplot graph presented based on principal components indicate that STI, GMP and MP indices had the highest correlation coefficients with each other and tolerant genotypes were located closed to the tolerant indices. These indices can be used as the best criteria for evaluation and identification of tolerant canola genotypes in breeding programs.

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Seed and Plant Journal
Volume 30, Issue 2
September 2014
Pages 269-287

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