STUDIES ON THE GENETIC ARCHITECTURE OF HARSHA COMPOSITE OF MAIZE (mays L.)
KrishiKosh
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Title |
STUDIES ON THE GENETIC ARCHITECTURE OF HARSHA COMPOSITE OF MAIZE (mays L.)
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Creator |
SUBBA REDDY, M.V
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Contributor |
SAI KUMAR, R
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Subject |
STUDIES, GENETIC, ARCHITECTURE, HARSHA, COMPOSITE, MAIZE,
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Description |
The genetic architecture of yield and its components were studied by North Carolina Design I to find out the appropriate selection scheme for intrapopulation improvement in 'Harsha'. The most important yield components were found to be number of grains per ear, ear girth and 100 grain weight. Hence emphasis be laid on these characters as selection criterion for yield improvement. The genotypes (full-sibs), as well as males and females differed significantly among themselves for all the characters studied viz., grain yield, plant height, ear height, ear length, ear girth, number of grains per ear, 100 grain weight, days to 50 per cent silk and days to 50 per cent dry husk. The magnitude of female variance and dominance component of genetic variance were higher than male variance and additive variance, respectively for most of the characters studied. Additive variance was significant for plant height, ear height and 100 grain weight~ The heritability estimates ranged trom low to medium for all the characters studied, except for plant height and 100 grain weight. Assuming an intensity of 5 per cent selection pressure, the expected genetic gain was higher with full-sib selection scheme as compared to mass selection. In both the selection schemes higher genetic gain was obtained for plant height, ear height, number of grains per ear and 100 grain weight. The results indicate that higher genetic gain for yield could be obtained in the base population of 'Harsha' composite by practicing more number of selection cycles to exploit residual additive variance with full-sib selection scheme, since the yield components viz., number of· grains per ear, ear girth and 100 grain weight which h ad significant positive correlation with grain yield and among themselves with medium to high heritability and with dominance variance in early generations. |
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Date |
2016-08-06T14:50:31Z
2016-08-06T14:50:31Z 1989 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/71301
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Language |
en
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Relation |
D3125;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
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