| چکیده انگلیسی مقاله |
To study the effects of terminal drought stress on yield and some physiological traits of barley (Hordeum vulgare L.), four cultivars, namely, Nosrat, Fajr 30, Yousef, and Moroco, and 2 advanced lines i.e. 17 and 67 were evaluated under terminal drought stress condition in Agriculture Biotechnology Research Institute of Iran, in 2011. The glasshouse experiment was arranged as a split-plot in a randomized complete block design with three replications. The results of the experiment revealed that total biomass, grain yield, yield components, harvest index (HI), relative water content (RWC), leaf water potential (WP), stomatal conductance, and chlorophyll content significantly decreased while relative water loss (RWL), unfilled grains per spike, canopy temperature and electrolyte leakage significantly increased in drought condition. Yousef and Moroco could be considered as, respectively, drought-tolerant and drought-sensitive genotypes, with grain yield (575 and 142 g.m-2), relative water content (78.2% and 69 %) and decrease in rate of stomatal conductance (63% and 93 %) in drought stress, respectively. The results of principal component analysis suggested that some of the physiological traits such as RWC, stomatal conductance, and canopy temperature, as the first important component, could be used for genotype screening under terminal drought stress. |