Document Type : Original Article
Authors
1 Assistant professor, Agriculture and Natural Resources Research Station of Neishabour, Iran
2 Agriculture and Natural Resources Research Station of Neishabour
Abstract
In order to study the genetic variation, identification and selection among wheat genotypes based on quantitative indices of drought stress tolerance, this experiment was conducted with 16 bread wheat genotypes arranged as a randomized complete block design with three replications under normal and restricted irrigation regimes at the Neishabour Agricultural and Natural Resources Research Station during 2008-09 cropping season. Used indices were Mean Productivity (MP), Geometric Mean Productivity (GMP), Harmonic Mean (HMP), Stress Tolerance Index (STI), Stress Susceptibility Index (SSI), Tolerance Index (TOL) and Lin and Binns Sustainability index (Pi). Results showed that the highest grain yield under stressed environment and the greatest values of MP, GMP, HARM, STI and Pi were obtained in genotype no. 2. Analysis of correlation and mean grain yield under restricted and normal irrigation conditions showed that these five indices were suitable for screening genotypes. According to these indices and grain yield under these two environments, the best drought tolerant genotypes were no. 2, 11 and 14. Multivariate biplot diagram showed that genotypes no. 2, 11 and 14 were adjacent to drought tolerance indices i.e. MP, GMP, HARM, and STI. Cluster analysis results also revealed that genotypes no. 2, 11 and 14 were drought tolerant and genotypes no. 3, 8, 9 and 13 were drought susceptible lines.
Keywords
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