Characterization of induced mutants for earliness and anthracnose resistance traits of common bean (Phaseolus vulgaris L.)

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Date
2022-01
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
The present investigation entitled “Characterization of induced mutants for earliness and anthracnose resistance traits of common bean (Phaseolus vulgaris L.)” was conducted during Kharif 2020 at the Experimental farm of Regional Horticulture Research Station Bhaderwah (RHRSB), SKUAST-J for ascertaining the nature and extent of genetic variation, to outline the association of grain yield/plant with yield contributing traits and to carry out divergence analysis through Mahalanobi’s D2 multivariate analysis (1928). RBD statistical experimental design was used to partition the variation into different components. The presence of sufficient amount of genetic variation was revealed by analysis of variance among mutant lines of common bean generated by gamma rays and ethyl methane sulphonate mutagens. Components of genetic variation revealed that phenotypic variance was relatively higher than genotypic variance for all the morpho-physiological and biochemical traits which implying a role for the environment in the expression of such traits under studied. Grain yield / plant was positively and significantly correlated with number of seeds/pod, number of clusters/plant, pod length, 1000 seed weight and number of pods/plant which revealed the importance of these characters in contributing grain yield /plant. High heritability coupled with high genetic advance was observed for morphological and biochemical traits viz., zinc content, iron content, grain yield/plant, number of clusters/plant, number of pods/plant, number of seeds/pod and days to flowering indicating that these parameters are governed by additive-gene action and direct phenotypic selection is effective for improving such traits. The highest inter-cluster distance was observed between cluster IV and V (342.66) followed by cluster III and IV for morphological trais and III and V (342.93) for biochemical traits and these can be used in hybridization programme. In the light of present investigation, it is concluded that the least disease incidence (anthracnose) along with earliness and superiority in grain yield/plant was recorded in mutant lines viz., R-BL-M3-1, R-BL-M3-9, R-BL-M3-10, R-BL-M3-12, R-BL-M3-13, R-BL-M3-14, R-PL-M3-18, R-PL-M3-20 and R-PL-M3-22 as compared to controls ( Bhaderwah local (BL)& Poonch local (PL) of common bean and these mutant lines may be utilized as mutant stocks as a donar parent for common bean improvement programme.
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Preferred for your work. Devi, Shilpa., 2021. Characterization of induced mutants for earliness and anthracnose resistance traits of common bean (Phaseolus vulgaris L.) M.Sc. Thesis, SKUAST-Jammu
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