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STUDIES ON GENETIC DIVERSITY FOR YIELD AND QUALITY TRAITS IN CHILLI (Capsicum annuum L.)

KrishiKosh

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Title STUDIES ON GENETIC DIVERSITY FOR YIELD AND QUALITY TRAITS IN CHILLI (Capsicum annuum L.)
 
Creator JANAKI MARADANA
 
Contributor Dr.L. NARAM NAIDU
 
Subject variability, heritability, genetic advance,phenotypic coefficients ,Correlation and path analysis
 
Description An investigation was carried out during kharif 2012-13 at Horticultural Research Station, Lam, Guntur with 63 genotypes of chilli (Capsicum annuum L.) in a randomized block design with two replications to study variability, heritability, genetic advance as per cent of mean, genetic divergence, character association and the magnitude of direct and indirect effects of 15 different quantitative and qualitative traits with yield per plant.
The study revealed significant differences among genotypes for different characters studied. The genotypic coefficients of variation for all the characters studied were lesser than the phenotypic coefficients of variation indicating the masking effect of the environment. High heritability coupled with high genetic advance as per cent of mean was observed for all the characters except days to 50 per cent flowering indicating the predominance of additive gene action suggesting, direct phenotypic selection may be useful with respect to these traits.
Correlation and path analysis revealed that plant height, fruit set per cent, number of fruits per plant, number of seeds per fruit and ascorbic acid had positive significant association and positive direct effects on yield per plant indicating the use of these attributes in selection to evolve high yielding varieties of chilli.
The results of multivariate analysis indicated the presence of considerable genetic divergence among the 63 genotypes studied. The 63 genotypes were grouped into 8 clusters in both D2 analysis and Ward’s minimum variance method. This analysis clearly indicated that the genetic diversity and geographical diversity were not related.
By Mahalanobis’ D2 statistic, it could be inferred that fruit diameter followed by yellow carotenoids, red carotenoids, ascorbic acid and capsaicin contributed maximum towards genetic divergence.

Principal component analysis identified six principal components (PCs), which contributed 76.83 per cent of cumulative variance. The significant factors loaded in PC1 towards maximum genetic divergence were number of seeds per fruit, total color value, ascorbic acid, number of fruits per plant, average dry fruit weight and fruit diameter. 2D and 3D graphs showed wide divergence between Warangal chapatta and LCA-724, LCA-756, LCA-353, LCA-716, Aparna which are also distantly placed with LCA-702 signifying their usefulness in chilli breeding to develop high heterotic hybrids.

Agglomerative cluster analysis revealed wide genetic distance between the genotypes of cluster VII (LCA-707, HC-28, LCA-720, KT-1 and LCA-702), cluster IV (LCA-353, LCA-716, LCA-756, LCA-724, LCA-703, Punjab Gucchedar, Pusa Sadabahar, LCA-714, Pant C-1 and LCA-710) and the cluster VIII (Warangal chapatta).

The genotypes Warangal chapatta, LCA-702, LCA-724, LCA-756, LCA-353 and LCA-716 showed maximum inter-cluster distance in Mahalanobis’ D2 analysis, principal component analysis and cluster analysis and can be exploited for the development of heterotic hybrids in future breeding programmes.
 
Date 2016-07-25T12:30:10Z
2016-07-25T12:30:10Z
2013-06
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69751
 
Language en
 
Format application/pdf
 
Publisher Dr. Y. S. R. HORTICULTURAL UNIVERSITY