Variability, character association and genetic divergence studies in Indian mustard (Brassica juncea L. Czern and Coss.)
Loading...
Date
2021-07
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ANDUAT, Kumarganj, Ayodhya
Abstract
The present investigation entitled “Variability, characters association and genetic divergence studies in Indian mustard (Brassica juncea L. Czern and Coss.)” involving 40 genotypes was undertaken to examine the (i) variability for seed yield and its contributing traits, (ii) character association among different characters, (iii) direct and indirect effects of yield components on seed yield per plant and (iv) genetic divergence using D² analysis in the Indian mustard genotypes. The experiment was conducted at Students Instructional Research Farm at Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya (U.P.) during rabi, 2020-21. All the 40 Indian mustard genotypes were tested in Randomized Block Design with three replications. Observations were recorded on 12 quantitative characters namely, days to 50% flowering, days to maturity, plant height (cm), number of primary branches per plant, number of secondary branches per plant, length of main raceme (cm), number of siliquae on main raceme, number of seeds per siliqua, 1000-seed weight (g), harvest index (%) and seed yield per plant (g). Analysis of variance observed substantial amount of variability among the genotypes for all the characters, under study, found wide spectrum of variability among the genotypes. Phenotypic correlation was of higher magnitude as compare to their corresponding genotypic correlation. Among genotypes correlation the seed yield was having positively and significantly correlated with biological yield per plant (0.870) followed by harvest index (0.609), number of secondary branches per plant (0.342) and number of siliquae on main raceme. While positive non-significant correlation with days to maturity (0.132) followed by number of seed per siliquae (0.066) plant height (0.052) and days to 50% flowering (0.046). As a result, any selection based on these characters will increase the
performance and quality of Indian mustard. Path coefficient analysis showed that biological yield per plant, harvest index, number of primary branches per plant, number of siliquae on main raceme, days to maturity and number seed per siliquae were the most important character, controlling positive directly to seed yield. Mahalnobis D2 genetic divergence the non-
hierarchical Euclidean cluster analysis grouped 40 genotypes into 7 clusters. These indicated the existence of high degree of genetic diversity in the germplasm.
Description
Thesis