تجزیه چند متغیره برای صفات زراعی و کیفیت محصول چغندرقند تحت شرایط تنش خشکی

The present study was to determine the genetic diversity and grouping of 25 genotypes of sugar beet under drought stress and to identify the most important components explaining the variation of data. The experiment was conducted based on a randomized complete block design with four replications at Motahari Research Station, Karaj, Iran in 2012. Irrigation was done routinely up to the thinning and weeding stage, but subsequent irrigations were done after 200 mm evaporation from the class A evaporation pan. Analysis of variance showed that there were significant differences between genotypes for all of the traits under drought stress. According to the results of the cluster analysis, the genotypes were classified in four groups among which the first group including the genotypes 25, 20 and 3 was identified as superior group in terms of yield and quality. Results of principal components analysis indicated that the first three components explained more than 90 percent of the total variance. Also, the results of the clustering based on the two principal components were largely consistent with the results of the cluster analysis for grouping genotypes.