Document Type : Research Paper
Authors
1 Scientific Board, Agricultural and Natural Resources Research Center, Kermanshah, Iran
2 Associate Professor, Research Institute of Forest and Rangelands, Tehran, Iran
Abstract
Most of Iranian rangelands are located in arid and semi arid areas, therefore, drought resistance is an important issue in this regions' plants. Drought resistance variation of forage yield for 11 genotypes of Elymus hispidus was examined in complete block design with three replications under normal and dryland farming system, in Islam Abad Gharb, Kermanshah, Iran, during 2004-2006. Significant variation (p<0.01) for forage yield were observed between with and without tension environments and between genotypes. Drought resistance indices of genotypes were measured for dry matter forage yield (Yp) of irrigated and dryland (Ys) conditions, like sensitivity to stress index, Tolerance (Tol), Mean Productivity (MP), Drought Tolerant Index (DTI), Harmonic Mean (HM) and Geometrical Mean of Productivity (GMP). Variance analysis of drought resistance indices showed that genotypes had significant variation at 1% level for DTI, MP and Yp and at 5% level for HM and GMP. Significant variation for SSI, Tol and Ys were not observed among genotypes. The indices of MP, GMP, HM and DTI showed the significant positive correlation with Ys and Yp, therefore selection for drought resistance were performed based on this indices. Also, the results of mean productcomparision of Ys, Yp and drought resistance indices by Duncan method at 5% level showed that genotypes 890-5 and 890-6 has higher drought resistance value and can be introduced as a suitable genetic material for rangeland reclamation or breeding programs for drylands in Kermanshah province. This results were confirmed by claster and principle component analysis.
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