GENETIC DIVERGENCE AND PATH ANALYSIS IN MUNGBEAN (Vigna radiata)

Abstract

In order to investigate the genetic divergence and path analysis of Mungbean (Vigna radiata) a study was carried out at Sher-e-Bangla Agricultural University farm,Bangladesh during March to May 2017. The field experiment was laid out in the main field in Randomized Complete Block Design (RCBD) with three replications. 20 genotypes and 6 varieties were used as the experiment.Data were recorded on ten yield and contributing traits. It was observed that significant variation present among all the genotypes used for most of the traits under studied. Days to 50% flower showed Genotypic coefficient of variation (GCV) was lower than phenotypic coefficient of variation. Genotypes G10 required minimum (70) days to mature on the other hand G2,G7,G13 and G21 were needed to maximum days to maturity. The high heritability, the genetic advance,genetic advance in percent of mean was considerable for seeds per pod indicating apparent variation was present in genotypes. The thousand seed weight of G12 had the highest seed weight and the lowest thousand seed weight value was found from G7.The highest yield of genotypes (31.93g) was obtained in G25 whereas, the lowest yield value in G3. The yield per plant showed highly significant and positive correlation with days to 80% maturity,branches per plant,branch length, pods per plant,seeds per plant, seed weight at both genotypic and phenotypic level indicated that the characters were influenced by same gene and simultaneous improvement would be effective. The genotypes were classified under five clusters, cluster I was associated with four genotypes namely G1, G2,G3 and G21. Cluster II was contained in three genotypes namely G10, G20 and G23. Among the five clusters, cluster III composed of six genotypes. The genotypes were G4, G5, G7, G13,G14 and G15. Cluster IV consists of five genotypes G6,G16,G25 and G26. Cluster V constituted with eight genotypes G8,G9,G11,G12,G17,G18,G19 and G22 .Thus, considering the magnitude of phenotypic traits, genetic distance,contribution of character towards divergence, magnitude of cluster mean and agronomic performance the genotype G6,G16,G24,G25,G26 from cluster IV for maximum number of pods in a plant and yield per plant.G2,G3 for early maturity from cluster I. Therefore considering group distance and other agronomic performances for inter genotypic hybridization among genotypes are suggested for future breeding program.