Evaluation of variability for Quantitive Traits and Validation of Molecular Markers for Fibre Quality in Gossypium hirsutum Cotton
KrishiKosh
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Title |
Evaluation of variability for Quantitive Traits and Validation of Molecular Markers for Fibre Quality in Gossypium hirsutum Cotton
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Creator |
Chandrashekar D. Angadi
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Contributor |
Manjula S. Maralappanavar
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Subject |
Genetics and Plant Breeding
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Description |
Gossypium hirsutum L. produces 90% of the world’s cotton. Modernization of textile industry necessitates cultivars with high fiber strength. In the present investigation intraspecific Recombinant inbred line (RIL) mapping population was studied with a special emphasis for fiber quality at ARS Dharwad, during 2011-12 season. High degree of genetic variability was observed for yield and yield contributing traits studied and revealed highly significant differences among the genotypes. RIL-13 (15.08q/ha) recorded high seed cotton yield, ten RILs recorded boll weight of above 4.5 g and RIL-5 (5.04g) recorded highest boll weight. Fiber strength above 25 g/tex was observed in RIL number-59 (27.2 g/tex), 23, 153 and 154 recorded 25.2 g/tex. Ten RILs recorded more than 28 mm of fiber length among which RIL-105 (29.3 mm) and RIL-20 (29 mm) recorded superior fiber length. Pubescence is an important trait contributing to jassid tolerance. One line (RIL-132) was observed to possess highest rating of 9 while nine and forty RILs had 8 and 7 rating respectively. Association analysis across genotypes revealed highly significant positive correlation for yield with bolls per plant, boll weight, 2.5% span length and micronaire value. Path analysis showed positive direct effect of boll weight, bolls per plant, lint index, 2.5% span length and micronaire value on yield. Twenty nine cotton SSR markers reported for fiber strength were used to screen the parents. The mapping population was genotyped with 7 polymorphic SSRs among which CIR-246 marker explained 3.2% of phenotypic variability for fiber strength. The high fiber quality RILs identified in this study can be used in cotton breeding programme in hybrid and varietal development with high fiber quality. |
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Date |
2016-11-21T17:30:47Z
2016-11-21T17:30:47Z 2012 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/86793
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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