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GENETIC DIVERGENCE AND PATH ANALYSIS IN DESI COTTON (Gossypium arboreum L.)

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Title GENETIC DIVERGENCE AND PATH ANALYSIS IN DESI COTTON (Gossypium arboreum L.)
 
Creator ANJANEYULU CHALLAPALLI, S
 
Contributor KRISHNA RAO, K.V
 
Subject GENETIC, DIVERGENCE, PATH ANALYSIS, DESI, COTTON
 
Description The present investigation was carried out during kharif 2003-04 at Regional
Agricultural Research Station, Lam, Guntur with 60 genotypes of diploid cotton
(Gossypium arboreum L.) to elicit information on the nature and extent of the genetic
variability, heritability, genetic advance as per cent of mean, genetic divergence,
character association and the magnitude of direct and indirect effects of yield and
quality component traits with seed cotton yield through path coefficient analysis. The
observations 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 outturn (%),
2.5% span length (mm), maturity coefficient, uniformity ratio (%), micronaire (10-6
g/in), bundle strength (g/tex) and seed cotton yield (kg/ha).
The genotypic coefficients of variation for all the characters studied were lesser
than the phenotypic coefficients of variation indicating the masking effects of the
environment. High genetic variability coupled with high heritability and genetic
advance as per cent of mean was observed for number of monopodia per plant, number
of bolls per plant and seed cotton yield revealing the role of additive gene action
governing the inheritance of these traits and improvement of these characters is
possible through simple selection.
The results of multivariate analysis indicated the presence of considerable
genetic divergence among the 60 genotypes studied. The 60 genotypes were grouped
into 8 clusters. Clustering pattern of genotypes did not follow geographical origin,
suggesting that geographical isolation may not be the only factor causing genetic
diversity. Out of 15 characters studied, micronaire followed by boll weight, seed cotton
yield and days to 50% flowering contributed maximum towards divergence.
Divergence studies revealed that crosses made between the genotypes grouped in
cluster III viz., KWA 23 and cluster VII viz., NA 529 followed by cluster II viz., DLSA
56, DLSA 114, LD 832, LD 843, HD 427, MDL 2607, RG 277, RG 359, LAS 2, RAS
2, AKA 9136, KWA 140, KWA 142 and PAIG 8/1 and cluster VIII viz., Pondur white
may throw high heterotic recombinants in G.arboreum cotton.
The correlation study indicated that days to 50% flowering, number of bolls per
plant, boll weight, number of seeds per boll and lint index exhibited significant positive
association with seed cotton yield, and simultaneous improvement of these characters
along with seed cotton yield is possible. While fibre quality parameters, 2.5% span
length and micronaire showed significant negative association with seed cotton yield
denotes simultaneous improvement of these traits along with seed cotton yield is not
possible, so a balance among the attributes has to be derived to a desired level.
The path analysis further revealed that number of bolls per plant and boll weight
exerted high positive direct effect on seed cotton yield. Since correlations of these
parameters are almost equal to direct effect, direct selection through these characters
for improvement of seed cotton yield will be highly rewarding.
Thus, the present study revealed that the major emphasis should be laid on
selection process with more number of bolls per plant and increased boll weight for
realising higher seed cotton yield, in desi cotton (G.arboreum L.).
 
Date 2016-08-20T13:42:23Z
2016-08-20T13:42:23Z
2004
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73158
 
Language en
 
Relation D7671;
 
Format application/pdf
 
Publisher ACHARYA N.G.RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD