Study of Genetic Diversity in sugar beet (Beta vulgaris L.) genotypes for bolting resistant and morpho-physiological traits

Plant breeding is based on the genetic diversity. genetic diversity origin from the natural evolution and it is the most important component of the stability of biological systems and ensure long-term compatibility and the survival of the population. One of the main goals plant breeders is the Cultivars resistant to stem for autumn cultivation of sugar beet. There are more than bolting to a decrease of sugar content, root yield and purity of the raw juice are low. The purpose of this experiment was investigate the genetic diversity among Half sib breeding lines for resistance to bolting and some morpho-physiological traits. For this purpose, a test with 47 lines in a randomized complete block design with 3 genotype controls were implemented. The resulting of variance Analysis showed that the effect of genotype on percent of bolting, percent of sucrose, percent of cold resistance, leaf area, height bolting, total of root weight, length and diameter of root were significant at the 1% level. The effect of genotype on the characteristics of ionic liquids and specific leaf area was significant at the 5%level. To determine the genetic relationships among genotypes for all traits, cluster analysis using Ward's method and squared Euclidian distance as distance measure are used and the genotypes were divided into 5 groups. The discrimination function analysis group in obtained from the cluster analysis confirmed result. Also The cluster analysis based on trait of bolting with method of Ward divided genotype in to 6 groups that HSF-780 along with control varieties resistant genotypes Eudoro and Giada were in the top group.