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CHARACTER ASSOCIATION AND GENETIC DIVERGENCE IN UPLAND COTTON (Gossypium hirsutum. L.)

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Title CHARACTER ASSOCIATION AND GENETIC DIVERGENCE IN UPLAND COTTON (Gossypium hirsutum. L.)
 
Creator KARUNAKARA RAJU, G.B
 
Subject CHARACTER, ASSOCIATION, GENETIC, DIVERGENCE, UPLAND, COTTON
 
Description The present investigation was carried during 2004-2005 at Regional
Agricultural Research Station Lam, Guntur with 80 genotypes of cotton
(Gossypium hirsutum) to study the variability, heritability, genetic advance
as percent of mean, genetic divergence, character association and the
magnitude of direct and indirect effects of yield component traits with
yield through path coefficient analysis. The data were recorded on fifteen
characters viz., days to 50% flowering, number of monopodia per plant,
number of sympodia per plant, number of bolls per plant, boll weight(g),
number of seeds per boll, seed index (g), lint index (g), ginning
percentage, 2.5% span length (mm), micronaire (10-6 g / in), maturity
coefficient, uniformity ratio and bundle strength (g/tex) and seed cotton
yield per plant.
The results of multivariate analysis indicated the presence of
considerable genetic divergence among the 80 genotypes studied. The 80
genotypes were grouped into 10 clusters. Clustering patterns of genotypes
did not follow geographical origin, suggesting that genetic diversity is not
necessarily always related to geographic diversity. Out of the 15
characters studied 2.5% span length, lint index, boll weight and number of
monopodia per plant contributed maximum towards divergence. Based
upon the divergence studies crosses may be made between the genotypes
of cluster III viz. TCH 1390, BUSP 13, GSHV 99/207, GJHV 53, L 603,
Surabhi, RAH 7553, ARB 8906, CCH 510-4, ADB 320, ICMF 230,
L 804, ARB 760, LPS 141, CPD 755, Krishna, NDLH 1755, TCH1 452,
GMR 5 and cluster X (HD 328) followed by crosses between cluster IX
(PUSA 9217) and cluster X (HD 328) to obtain potential hybrids and
desirable segregants in cotton.
Correlation studies indicated that number of bolls per plant, boll
weight number of seeds per boll, lint index and seed index had significant
positive association with seed cotton yield.
The path analysis indicated that number of bolls per plant, boll
weight, number of seeds per boll, lint index, 2.5% span length and
maturity coefficient exerted direct positive effect on seed cotton yield.
Boll weight and number of bolls per plant exerted considerable indirect
positive effect via number of seeds per boll and maturity coefficient on
seed cotton yield.
Thus, the present study revealed that the major emphasis should be
laid on selection process with high number of bolls per plant, high boll
weight and high lint index for realizing higher seed cotton yield.
 
Date 2016-08-20T13:54:51Z
2016-08-20T13:54:51Z
2005
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73170
 
Language en
 
Relation D7680;
 
Format application/pdf
 
Publisher ACHARYA N.G.RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD