بررسي عملكرد دانه در 20 لاين پيشرفته جو با استفاده از شاخص هاي مقاومت به تنش خشكي در شرياط آبي و ديم خراسان شمالي

Investigation of grain yield in 20 advanced genotypes of barely (Hordeum vulgareL.) using drought tolerance indices in Northern Khorasan Province

In order to identification of superior genotypes for grain yield, 20 advanced genotypes of barely (Hordeum vulgare L.) were sown in two separate experiments under optimum and drought stress condition using Randomized Complete Block Designs with four replications in dry land research station, northern Khoorasan, Shirvan, Iran, during 2005-2006. Data were collected and analyzed for each experiment and combined over two experiments. The grain yield in optimum (Yp) and stress (Ys) condition for each genotype were used to estimate the five drought resistance indices as: tolerance index (TOL), stress susceptibility index (SSI), mean productivity (MP), geometric mean productivity (GMP) and stress tolerance index (STI). The data subsequently used in principal components analysis. Based on bi-plot of the first two principal component scores, genotypes were distributed into four groups. Results showed that genotypes 10, 11, 16, 18 and 19 with average values of 1670 kg/ha were recognized as the best varieties for dry condition. The genotypes 12, 13, 14, 17 and 20 with average values of 1300 and 1974 kg/ha for Drought and normal conditions, respectively introduced as the best genotypes for cultivation for both environments in semi arid regions. Genotypes 1, 5 and 15 with average values of 1450 kg/ha had moderate production for normal conditions. Distribution of genotypes based on the first two component scores was in agreement with Grouping of genotypes by Duncan means comparison method.