The genetic variability in intra specific crosses of Indian mustard Brassica juncea (L.) Czern and Coss.genotypes were evaluated during rabi 2009-10 to study the genetic variability, heritability and genetic advance as percentage of mean for nine quantitative characters viz. plant height (cm), number of siliquae per main branch, number of primary branches per plant, number of secondary branches per plant, length of siliquae (cm), number of seeds per siliqua and seed yield per plant (g), days to 50% flowering and days to maturity. Analysis of variance showed significant differences among the crosses for all characters under study except for length of siliqua. Maximum genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) was exhibited by number of secondary branches per plant followed by seed yield per plant and number of primary branches per plant. High estimates of heritability coupled with high genetic advance as per cent of mean was observed for number of secondary branches per plant followed by seed yield per plant and number of primary branches per plant.

To discriminate maize inbred lines based on morpho-physiological and yield traits using D 2 statistics and principal component analysis (PCA), fifty five genotypes available at Department of Genetics and Plant breeding, Sam Higginbottom Institute of Agriculture Science and Technology, Allahabad were tested during Rabi 2013-14 under irrigation condition in Randomized Block Design with three replications. Analysis of variance revealed significant differences for 18 characters studied among the genotypes. The D 2 statistics displayed that cluster I, being largest group, comprises 37 maize genotypes followed by cluster II (13), III (3), IV (1) and V (1). The maximum intra-cluster distance was obtained for cluster I (624.35) while cluster IV and V showed Null values for it indicating homogeneous nature of the genotypes within the cluster. Further more, maximum inter-cluster distance was recorded between cluster IV and V (22331.82) followed by clusters III and V (15174.83) and clusters II and IV 14480.99). D 2 statistics and principal component analysis (PCA) emphasized that days to 50 per cent tasseling, silking and maturity, anthesis-silking interval, seed fill duration, cob weight, 100 seed weight and grain yield/plant were major contributing traits for total genetic diversity. Research results indicated that the inbreds under study are highly diversified and hence, high heterotic hybrids would be resulted through the crossing of diverse lines clubbed under different clusters as parent in any breeding programme aimed to enhance grain yield.

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The present investigation was conducted to examine the genetic diversity existing among 50 genotypes of maize, during Rabi-2014sown under randomized block design with three replications. The data were recorded for sixteen quantitative characters to obtain estimates of variability, heritability, genetic advance and genetic divergence. Significant differences were observed among the genotypes for all the characters studied except for number of cobs per plant. High estimates of GCV and PCV were observed for leaf area indexfollowed by leaf area per plant and number of grains per row. High heritability coupled with high genetic advance was recorded for leaf area per plant and plant height. MahalanobisD 2 analysis revealed considerable amount of diversity in the material. The 50genotypes were grouped into 8 heterogeneous clusters. Among these clusters,Cluster Ihad maximum number of genotypes (14 genotypes).On the basis of mean performance genotypesHKI 193-1-1, R-13-1, TARUN 83-1-32, R-13-1-17 was found to be the best genotypes in Allahabad agro-climatic conditions. The characters such as leaf area per plant, plant height, days to 50 % tasseling, days to 50 % silking, seed fill duration and cob height showed high heritability coupled with moderate genetic advance which indicates that there is more chance of inheritance from progeny to their offspring, therefore these characters should be given top priority for effective selection.The present investigation revealed that ClusterVI and VIIIwere most diverse.Genotypes constituted in these clusters may be used as parents for future hybridization.