Genetic Studies in Gossypium barbadense L. Cotton for Productivity
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Title |
Genetic Studies in Gossypium barbadense L. Cotton for Productivity
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Creator |
Deepika M.
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Contributor |
S.S. Patil
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Subject |
Genetics and Plant Breeding
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Description |
Gossypium barbadense species of cotton proved to be better in quality but poorer in yield compared to other cotton species, the present study was undertaken for evaluating intra barbadense F1s and varieties aiming at better yield and better pollen germination. Four intra barbadense crosses and six generations (P1, P2, F1, F2, B1 and B2) of each cross were subjected to generation mean analysis. Results showed that majority of the traits were influenced by non- additive gene action and the crosses exhibited heterosis and heterobeltosis for yield and important yield attributing traits such as number of bolls, boll weight, lint yield and number of sympodia. Cross RAB 531 x RAB 533 with highest magnitude of dominance and highest per cent mid parent heterosis of 26.4 per cent for seed cotton yield. Heterosis and Combining ability studies for yield characters in twenty four barbadense F1s were carried out. None of the F1s surpassed the commercial check DCH-32 in yield and it is noted that among the four testers studied RAB 533 appeared to be the best general combiner and among the six lines PIMA 54 appeared to the best general combiner. Cross ICB 181 x RAB 533 had significant positive heterosis of 30.67 per cent over mid parent. Variability studies in eighteen three way cross F1s were taken up and was observed that higher heritability coupled with high genetic advance was noticed in seed cotton yield and plant height which gives an indication of predominance of additive genetic effects in controlling the character. A basic pollen germination study was taken up in twenty four barbadense F1s and their parents. The parents and hybrids showed significant differences with respect to the pollen germination percentage. Crosses RAB 532 x USA 206, RAB 531 x USA 788, RAB 532 x USA 788 had better per cent pollen germination over standard check DCH 32. |
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Date |
2016-11-10T16:23:37Z
2016-11-10T16:23:37Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/84954
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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