بررسي تحمل به خشكي ارقام گلرنگ بهاره در منطقه اصفهان

Assessment of Drought Tolerance of Spring Safflower (Carthamus tinctorius L.)Cultivars in Isfahan Province

In order to determine of the best drought resistance indices and identify the resistance genotypes, 10 spring safflower cultivars were sown under drought and non-drought conditions based in a completely randomized block design with three replications on the research farm of Islamic Azad University of Khorasgan. Analysis of variance revealed a significant difference and genetic variability between cultivars for drought resistance indices. Assessment of simple correlation coefficients among drought resistance indices and seed yield of cultivars showed that GMP and STI help identify cultivars with have high potential yield and tolerant to drought stress. Therefore, these were recognized as the best resistance indices. Comparison of the mean of cultivars for the geometric mean of productivity (GMP) and stress tolerance index (STI) and biplot display designed that Sterling, NebraskslO, land race Koseh and Gila the most resistant cultivars and U.S. 10 were the most sensitive to drought stress. Classification of cultivars using cluster analysis revealed that crossing U.S. 10 with Isfahan28, Arak2811 and CI 11 cultivars with maximum genetic distance are recommended for genetic improvement of drought resistance in spring safflower cultivars.