علی بختیاری غریبدوستی

To study the yield and agronomic traits in canola variety under drought stress condition، an experiment was conducted base randomized complete block design (RCBD) with three replications in researching farm of Karaj branch، Islamic Azad University in agriculture year 2010-2011. Investigated traits including kernel yield، days to physiological maturity، days to fifty percent flowering، pod number in main stem، plant height، biological yield، pod length، kernel number in pod، thousand kernel weight، leaf length، leaf width، pod weight and lateral branch. The variance analysis of the studied traits showed that for all traits among studied cultivars there is a significant difference. The most amount of seed yield was for Sarigol and after that SLMO46 and Golden 13 cultivars had more excellence. Also the results of stepwise regression showed that biologically yield، pod weight and the number of pods in main stem had more effect on the yield. In factor analysis، five firs factors justified more than 77 percent of data variance. In firs factor leaf length and leaf width، in second factor biologic yield and seed yield، in third factor the number of days to 50 percent of flowering and the number of day to physiological maturity، and in forth factor number of lateral branch trait and in fifth factor the number of seeds per pod had the most effect.

In order to investigation of drought stress effect on yield and yield components in canola cultivars and identification of drought tolerant cultivars, an experiment was conducted in research field of agriculture faculty in Islamic Azad University- Karaj branch in 2009-2010. Ten canola varieties in a Randomized Complete Block Design with three replications investigated under normal and stress conditions. Analysis of variance indicated significant differences between genotypes for all traits except lateral branch and weight of hundred kernels. The highest kernel yield in normal experiment was for Likord and Hyola308 cultivars 875.7 and 820.1 grams per square meter respectively. The highest kernel yield in stress experiment was for Likord and Sarigol cultivars 287.88 and 242.65 grams per square meter respectively. Stress Tolerance including Mean Productivity, Geometric Mean Profitability, Tolerance index and Harmonic average were capability to revealed cultivars with high yield potential and drought tolerant and known as best tolerance indices. Base these indices the best cultivar was Likord. Base biplot graph Likord and Zarfam cultivars were the best tolerant and Modena, Okapi, Hyola401 and Hyola308 were the high susceptible cultivars to drought stress.