Development of High Yielding Single Cross Hybrids from newly Developed Inbred Lines of Maize (Zea mays L.)
KrishiKosh
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Title |
Development of High Yielding Single Cross Hybrids from newly Developed Inbred Lines of Maize (Zea mays L.)
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Creator |
Netravati
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Contributor |
G. Shanthakumar
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Subject |
Genetics and Plant Breeding
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Description |
A study was conducted to assess the combining ability, nature of gene action and extent of heterosis in respect to grain yield, its componental traits and quality characters, involving 91 hybrids (developed through half diallel), 14 inbreds and 16 commercial checks in maize during kharif 2011-12 at MARS, University of Agricultural Sciences, Dharwad. The analysis of variance indicated significant amount of variability among genotypes for 15 quantitative characters studied. The computed variance ratios (GCA:SCA variance) revealed the predominance of nonadditive gene action in the inheritance of all the traits. The study on the combining ability revealed that the lines DMIL 9 (5.160) and DMIL 5 (4.566) were found to be best general combiners for grain yield per plant and grain yield per hectare than the rest. The study on standard heterosis revealed that 5 hybrids viz.,DMIL 9 x DMIL 5 (23.23 %), DMIL 10 x DMIL 7 (19.60 %), DMIL 4 x DMIL 3 (19.24 %), DMIL 8 x DMIL 7 (18.97 %) and DMIL 14 x DMIL 10 (16.70 %) exhibited significant positive heterosis over best commercial check NK 6240 and also exhibited significant sca effect for grain yield and its components, obtained from the parents with high x high gca effects. It is suggested to evaluate the identified hybrids in large scale trail to confirm their superiority. The hybrids, DMIL 10 x DMIL 3 (29.22 %), DMIL 10 x DMIL 9 (14.79 %), DMIL 11 x DMIL 10 (14.61 %) and whereas DMIL 10 x DMIL 3 (3.55 %), DMIL 9 x DMIL 3 (3.38 %), DMIL 7 x DMIL 3 (3.22 %) were top crosses showed the significant heterosis as well as sca effects for protein content and starch content, respectively. Most of these were obtained from the parents with high x high gca effects. These results revealed the possibility of realizing higher yield and quality through heterosis breeding. |
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Date |
2016-11-21T17:19:17Z
2016-11-21T17:19:17Z 2012 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/86784
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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