Document Type : Research Paper
Authors
1
Researcher, Sugar Beet Seed Institute (SBSI), Agricultural Research, Education and Extension Organization, Karaj, Iran
2
Associate Professor, Sugar Beet Seed Institute (SBSI), Agricultural Research, Education and Extension Organization, Karaj, Iran
3
Assistant Professor, Sugar Beet Seed Institute (SBSI), Agricultural Research, Education and Extension Organization, Karaj, Iran
Abstract
In this research, the reaction of 138 sugar beet half-sib families and their 11 parental populations to powdery mildew (Erysiphe betae Weltzien Vanha) was studied in a randomized complete block design with three replications at Motahari Research Station, Karaj, Iran in 2013. A linear scale of 0-9 was used for disease rating. On the basis of disease scoring conducted in 10th September, 22 genotypes with a score lower than 2.5 were found to be disease resistant. The families HSF-850, HSF-853, and HSF-848 with the disease score of 1, 1.2, and 1.3, respectively, were the most resistant families. Regression analysis showed that white sugar yield and sugar content were decreased by increasing the disease. Cluster analysis classified the initial populations as well as their half-sib families into 7 groups. Among these, most of the tolerant/resistant genotypes were clustered in the group 5 which could be used for resistance transfer. The cluster 2 included the genotypes HSF-584, HSF-582, HSF-557, HSF-551, HSF-866, HSF-844, HSF-670, HSF-556, HSF-628, HSF–610, HSF-564, HSF-685, HSF–619, HSF–664, and HSF-558 which were considered as families with optimum root yield, white sugar yield, white sugar content and sugar content. Therefore, these families could be used as pollinator parents to develop hybrid varieties or they can be exploited in the next cycle of family selection to develop new half-sib or full-sib families.
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