STUDIES ON GENETIC DIVERSITY FOR YIELD AND QUALITY TRAITS IN PAPRIKA (Capsicum annuum L.)
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Date
2017-07-29
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COLLEGE OF HORTICULTURE, VENKATARAMANNAGUDEM, WEST GODAVARI – 534 101 Dr. Y. S. R. HORTICULTURAL UNIVERSITY
Abstract
An investigation was carried out during kharif 2016-17 at Horticultural Research Station, Lam, Guntur with 44 genotypes of paprika (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 20 different quantitative and qualitative traits with dry fruit 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 excepting plant height, plant spread, number of primary branches per plant and days to 50 per cent flowering. This indicated the predominance of additive gene action in case of all the characters other than the aforesaid four characters suggesting direct phenotypic selection may be useful with respect to these traits.
Correlation and path analysis revealed that number of fruits per plant and fruit length 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 paprika.
The results of multivariate analysis indicated the presence of considerable genetic divergence among the 44 genotypes studied. The 44 genotypes were
Name of the Author :
T. LAKSHMI TIRUPATHAMMA
Title of the thesis :
STUDIES ON GENETIC DIVERSITY FOR YIELD AND QUALITY TRAITS IN PAPRIKA (Capsicum annuum L.)
Faculty :
HORTICULTURE
Major Field of study :
VEGETABLE SCIENCE
Major Advisor :
Dr. L. NARAM NAIDU
University :
Dr. Y. S. R. HORTICULTURAL UNIVERSITY
VENKATARAMANNAGUDEM
Year of submission :
2017
grouped into 6 clusters in D2 analysis and 7 clusters in 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 total extractable colour followed by red carotenoids and yellow carotenoids contributed maximum towards genetic divergence.
Principal component analysis identified eight principal components (PCs) and has contributed 83.62 per cent of cumulative variance. The significant factors loaded in PC1 towards maximum genetic divergence were weight of seeds per fruit, fruit diameter, number of seeds per fruit, 1000 seed weight, number of fruits per plant and fruit length. 2D and 3D graphs showed wide divergence between Warangal chappatta double patti and Byadagi kaddi, which are also distantly placed with LCA 512 and Warangal chappatta single patti signifying their usefulness in paprika breeding to develop high heterotic hybrids.
Agglomerative cluster analysis revealed wide genetic distance between the genotypes of cluster VII (LCA 511, Warangal chappatta single patti, LCA 512, Warangal chappatta double patti) and cluster IV (LCA 466, LCA 480, Jangareddy gudem local).
The genotypes Warangal chappatta double patti, LCA 511, LCA 512 and Warangal chappatta single patti showed maximum inter-cluster distance in Mahalanobis’ D2 analysis, principal component analysis and cluster analysis. So they can be exploited for the development of heterotic hybrids in future breeding programmes.
Description
to study variability, heritability, genetic advance as per cent of mean, genetic divergence, character association and the magnitude of direct and indirect effects of 20 different quantitative and qualitative traits with dry fruit yield per plant.
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Citation
Horticultural Research Station, Lam, Guntur