HETEROSIS AND COMBINING ABILITY ANALYSIS IN PIGEONPEA (Cajanus cajan (L.) Millsp.)
KrishiKosh
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Title |
HETEROSIS AND COMBINING ABILITY ANALYSIS IN PIGEONPEA (Cajanus cajan (L.) Millsp.)
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Creator |
RAMA DEVI, S
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Contributor |
PRASANTHI, L
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Subject |
planting, sowing, developmental stages, yields, crossing over, genetics, biological phenomena, pigeonpeas, heterosis, genotypes
PIGEONPEA, (Cajanus cajan (L.) Millsp.) |
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Description |
The present investigation comprising of eight parents of pigeonpea (Cajanus cajan (L.) Millsp.) and 15 cross combinations developed through a Line X Tester (5 X 3) crossing programme were evaluated for genetic parameters, heterosis, combining ability, character association and path coefficient analysis during kharif, 2010. The experiment was laid out in Randomized Block Design with three replications at the Regional Agricultural Research Station, Tirupati and observations were recorded on 14 characters. Analysis of variance indicated the existence of significant differences among the genotypes for all the characters. Among the parents, the lines ICPL-15225 and LRG-41, the testers ICPL-8863 and ICPL-87119 and among the crosses, ICPL-15225 X ICPL-8863, ICPL- 15225 X ICPL-87119 and LRG-41 X PRG-158 showed high mean performance for seed yield. Analysis of genetic parameters revealed higher phenotypic and genotypic coefficient of variation, heritability, genetic advance as per cent of mean for pods per plant, 100-seed weight, harvest index, phenol content, seed yield per plant, primary and secondary branches per plant in parents and for pods xiv per plant and seed yield per plant in crosses indicating that simple selection could be practiced for improving these characters. The expression of heterosis was most evident for pods per plant, seed yield per plant, phenol content, days to flowering, days to maturity, harvest index, seed protein and SCMR at vegetative phase. Significant heterosis, heterobeltosis, standard heterosis were recorded in the crosses viz., ICPL-15225 X ICPL-8863, LRG-41 X PRG-158, LRG-41 X ICPL-8863, LRG-41 X ICPL-87119 and ICPL-15225 X ICPL-87119 for most of the characters. The analysis of variance for combining ability indicated the predominance of non-additive gene action for all the traits due to higher sca variance than gca variance. Among the parents LRG-41 and ICPL-15225 were found to be good general combiners for harvest index, pods per plant and seed yield per plant, ICPL-2376 and ICPL-8863 for seed protein, phenol content and earliness, ICPL-7035 for seeds per pod, pod length, 100-seed weight and SCMR at vegetative phase, LRG-41 for plant height and branches per plant. Based on sca effects, per se performance, heterosis, ICPL-15225 X ICPL-8863, ICPL-15225 X ICPL-87119 and LRG-41 X PRG-158 were identified as the best specific cross combinations for hybrid breeding programme, while the crosses ICPL-15225 X PRG-158 and LRG-41 X ICPL-8863 were identified for advancing through recombination breeding programme. Character association studies indicated that the character pods per plant had significant positive correlation with seed yield per plant and also inter-correlations were observed among seeds per pod, pod length and 100- seed weight. Path coefficient analysis revealed the high positive direct influence of pods per plant on seed yield and it also had positive indirect effects on seed yield via all the characters except 100-seed weight and SCMR at vegetative phase in both parents and crosses. Hence, selection for pods per plant is suggested for the improvement of seed yield per plant in pigeonpea. |
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Date |
2016-06-02T10:39:28Z
2016-06-02T10:39:28Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/66611
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Language |
en
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Relation |
D8944;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
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