ارزيابي تحمل به خشكي در ژنوتيپ هاي گندم ديم از طريق كاربرد شاخص هاي تحمل و نمودارهاي پراكنش دو بعدي

Evaluation of Drought Tolerance of Dryland Wheat Genotypes by Using Resistance Indices and Biplot Chart

Drought stress is one of the important factors which effects plant production. In order to evaluate drought tolerance in winter wheat, a field experiment was conducted at Maragheh Dryland Agricultural Rsearch Center during 2006-2008 growing season. Twelve advanced wheat genotypes were studied in a randomized complete block design with 4 replications in two environmental conductions (drought and supplementary irrigated conditions). Results showed that there were significant differences among genotypes. Lines No.4, 1 and 12 with 1746, 1746 and 1744 kg/ha of seed yield were higher producers under drought conditions respectively. Under supplementary irrigation, Azar2(12), lines No.l, 4 and 10 with 2706, 2681, 2806 and 2674 kg/ha seed yield produced higher grain yields respectively. Significant correlation coefficients were found between Yp and Ys when stress tolerance index (STS), mean productivity (MP) and geometric mean productivity (GMP) indices were used. These indices can be used to determine resistant genotypes. Based on these indices and three-dimensional plots and biplot charts, lines NO. 4 (345 GBM) and 12 (Azar-2) can be selected as a drought tolerant and high yielding genotypes.