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Journal of Applied Sciences
Year: 2010  |  Volume: 10  |  Issue: 2  |  Page No.: 151 - 156

Assessment of Drought Tolerance in Barley Genotypes

L. Nazari and H. Pakniyat    

Abstract: In order to evaluate quantitative drought resistance criteria in some wild and cultivated barley, sixteen genotypes were tested under two different irrigation regimes (non-stressed and stressed). Plants were subjected to moisture stress at flowering period till maturity. Six drought tolerance indices, Stress Tolerance Index (STI), stress tolerance (TOL), Stress Susceptibility Index (SSI), Yield reduction ratio (Yr), Mean Productivity (MP) and Geometric Mean Productivity (GMP) were used. The indices were adjusted based on grain yield under stress (Ys) and non-stress (Yp) conditions. There were significant differences for all criteria among the genotypes. The significant and positive correlations of Yp with (MP, GMP and STI) and Ys with (MP, GMP and STI), as well as, significant negative correlation of SSI and TOL under stress environment, revealed that selection could be conducted for high values of MP, GMP and STI under both conditions and low values of SSI and TOL under stress condition. The correlation coefficients indicated that STI, MP and GMP are the best criteria for selection of high yielding genotypes both under stress and non-stress conditions. Results of calculated gain from indirect selection indicated that selection under moisture stress would be efficient in yield improvement compared to non-stress condition. Genotypes were significantly different for their yield under stress and non-stress conditions. Arivat (kavir), Aras, Goharjo and Afzal were the most desirable genotypes for both stress and non-stress environments.

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