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GENETIC DIVERGENCE IN CHILLI (Capsicum annuum L.)

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Title GENETIC DIVERGENCE IN CHILLI (Capsicum annuum L.)
 
Creator KIRAN KUMAR, P
 
Contributor CHENGA REDDY, V
 
Subject GENETIC, DIVERGENCE, CHILLI
 
Description The present study was conducted during kharif 2007 at Regional
Agricultural Research Station, Lam Farm, Guntur with 57 genotypes of chilli
(Capsicum annuum L.) which included collections from different geographic
regions to study the genetic variability, heritability, genetic advance as per cent
of mean, correlation, path coefficient analysis and genetic divergence. These
genotypes were evaluated for 15 characters viz., plant height (cm), plant spread
(cm), days to 50 % flowering, days to maturity, number of branches per plant,
number of fruits per plant, 100-dry fruit weight (g), fruit length (cm), fruit girth
(cm), number of seeds per fruit, 1000-seed weight (g), oleoresin (%), capsanthin
(EOA colour value), capsaicin content (%) and dry fruit yield per plant (g).
The genetic variability studies indicated that the material investigation
possessed variability which provides sufficient basis for selection by the breeder
High heritability coupled with high genetic advance as per cent of mean was
observed for all the characters except days to 50 % flowering, days to maturity
and 1000-seed weight.
Correlation between dry fruit yield per plant and its determining
characters inferred that plant height, plant spread, number of fruits per plant,
fruit length, fruit girth and number of seeds per fruit had positive significant
correlation with yield suggesting that effective improvement in yield can be
achieved through selection based on these characters.
Path analysis revealed high positive direct effect of fruit girth, fruit
length, plant height, days to maturity, number of seeds per pod, plant spread and
capsanthin content (EOA colour value). Hence, taller plants with more plant
spread, fruit length, fruit girth, number of seeds per fruit and early maturity
should be preferred while breeding for high dry fruit yield in chillies.
The total 57 genotypes of chilli obtained from different agro-climatic
zones were grouped into eighteen clusters in case of D2 analysis and 8 clusters in
principal component analysis and the grouping of genotypes was at random.
Oleoresin content contributed maximum towards diversity in D2 followed by
capsaicin content and capsanthin content (EOA colour value). Principal
component analysis identified five principal components, which contributed
84.17 % of the total variability of the genetic material. Capsaicin content and
capsanthin content (EOA colour value) explained maximum variance in the first
principal component, followed by oleoresin content.
Based on D2 statistic, crosses are proposed to be attempted in future
breeding programmes between cluster IX (LCA-825) and XVII (LCA-809),
followed by cluster XVII (LCA-809) and IV (LCA-851) and cluster IV (LCA-
851) and VIII (LCA-846) to obtain desirable segregants.
Agglomerative cluster analysis revealed wide genetic distance between
clusters IV (LCA-815, LCA-847, LCA-334, LCA-850) and V (LCA-802,
LCA-835, LCA-809, LCA-826) followed by clusters II (LCA-819, LCA-829,
LCA-816) and IV (LCA-815, LCA-847, LCA-334, LCA-850) and II (LCA-819,
LCA-829, LCA-816) and V (LCA-802, LCA-835, LCA-809, LCA-826). Hence,
hybridization among these clusters would produce superior segregants.
Based on the agglomerative cluster analysis, principal component
analysis and D2 statistic, the genotypes LCA-816, LCA-815 and LCA-809 were
from diverse groups and can be utilized in future hybridization programmes to
produce superior segregants.
 
Date 2016-08-02T10:35:05Z
2016-08-02T10:35:05Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/70462
 
Language en
 
Relation D8374;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD