Genotypic and Phenotypic co-effecients of variation, heritability, and genetic advance were estimated in Seventy three single parent families of neem on Twenty six different seed, biochemical and seedling attributes. The analysis of variance indicated significant differences among the single parent families for all the characters. The GCV and PCV were the maximum for total azadirachtin and its fractions aza A, B, D and H. Heritabilitily values were high for all the parameters except for root fresh weight, shoot fresh weight and total fresh weight. High heritability combined with high genetic advance as percentage. of mean was observed for all the seed parameters, total azadirachtin and its fractions, number of leaves, root to shoot ratio and total dry weight.
Genotypic and phenotypic variance, co-efficient of variation, heritability and genetic advance were estimated in 51 genotypes of guinea grass on 10 different fodder attributes. The analysis of variance indicated significant variation among the genotypes for all characters except crude fibre content and leaf-stem ratio. The GCV and PCV were the maximum for leaf weight, number of tillers per plant, green fodder yield per plant. stem weight, number of leaves per plant and dry matter content. Heritability values were very high for eight of the characters. High heritability combined with high genetic advance as percentage of mean was observed for number of leaves per plant, stem weight, leaf weight, green fodder yield per plant and dry matter content.
Genetic diversity in 51 genotypes of Guinea grass was estimated through D analysis. The genotypes were grouped into seven clusters. The clustering pattern indicated no relationship between the genetic divergence and geographic distribution. The intra cluster generalised distance was the highest in cluster. 1 (35 genotypes) and lowest in cluster III (2 genotypes). The inter cluster distance was the highest between clusters IV and VII and was the least between clusters II and III. Cluster VI exhibited the maximum mean values for plant height, leaf weight, leaf-stem ratio and crude protein content and least value for crude fibre content. Cluster V recorded the maximum mean values for stem weight and green fodder yield per plant. The best genotypes from different clusters were identified for future crossing programme for improvement of green fodder yield and quality..
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