Study on tolerance to terminal drought stress of bread wheat genotype using indices for susceptibility and tolerance to stress
Journal Title: International Journal of Farming and Allied Sciences - Year 2013, Vol 2, Issue 24
Abstract
In order to study the response of bread wheat (Triticum aestivum L.) to drought stress, two experiments were conducted in Research Station of Islamic Azad University, Ardabil Branch, in 2007-08 and 2008-09 cropping years. 6 wheat genotypes were evaluated during two experiments conducted under normal irrigation or non-stressed and terminal drought stressed conditions, based on randomized complete blocks design, with three replications. Results from combined analysis of variance based on grain yield trait showed that year proved significantly effective both under normal irrigation and drought stress conditions. Interaction of “genotype × year” was insignificant under both normal irrigation and drought stress conditions. Genotypes also proved significantly effective under normal irrigation, at 1% probability level, which put it in contrast with drought stress condition. Indices such as Stress tolerance index (STI), stress susceptibility index (SSI), tolerance index (TOL), mean productivity (MP) and geometric mean productivity (GMP) were calculated for various genotypes based on grain yield under both non-stressed and stressed conditions. Genotype 4057 was the most desirable among all 6 genotypes being studied. Grain yield of this genotype was 4.087 ton/ha under non-stressed condition, whereas its grain yield under stressed condition was 2.83 ton/ha. Mean productivity and geometric mean productivity were estimated to be 3.465 and 3.41 ton/ha, respectively, whereas values for drought tolerance index and drought susceptibility index of the genotypes were estimated to be 1.16 and 1.42, respectively. Pearson correlation coefficients used to identify the relation between grain yield and indices, revealed that indices such as MP, GMP and STI were significantly and positively correlated with grain yield under both conditions, which can be used to identify productive and drought tolerant genotypes for both environmental conditions. In general, 4057 was identified as tolerant genotype, whereas Saratovskaya-29 was identified as the most susceptible to terminal drought stress.
Authors and Affiliations
Vahid Mollasadeghi, Reza Shahryari, Amir Gharib Eshghi and Samaneh Elyasi
Keywords
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