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.)
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Creator |
KARUNAKARA RAJU, G.B
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Subject |
CHARACTER, ASSOCIATION, GENETIC, DIVERGENCE, UPLAND, COTTON
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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. |
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Date |
2016-08-20T13:54:51Z
2016-08-20T13:54:51Z 2005 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/73170
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Language |
en
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Relation |
D7680;
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Format |
application/pdf
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Publisher |
ACHARYA N.G.RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
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