Indian Society of Genetics & Plant Breeding

Hybrid vigour and combining ability in long duration pigeonpea [Cajanus cajan (L.) Millsp.] hybrids involving male sterile lines

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Hybrids, utilizing three genetic male sterile lines (DAMS-1,
ICPMS 3783 and KPMS 1050) and 12 diverse genotypes
of the long duration group of pigeonpea [Cajanus cajan
(L.) Millspj were evaluated for general and specific
combining ability, variance components and standard
heterosis. Among the lines DA 32, DA 34, DA 37, DA
46, DA 93-4, DA 93-2, DA 94-6 and Bahar mutant and
testers DAMS-1 and ICPMS 3783 were found to be good
general combiners for seed yield/plant-1 and other yield
contributing traits such as secondary branches/plant-1,
clusters/planC1 and number of pods/planc1. The tester
DAMS-1 was also a good general combiner for primary
brancheslplanc1 and per cent pod setting. The estimates
of a2gca and a2sca suggested partial dominance of additive
genetic action for number of pods/planc1. While for days
to flowering, days to maturity, plant height, number of
primary branches/planc1, per cent pod setting, harvest
index and seed yield/planc1 over dominance with non
additive genetic variance was observed. The contribution
of testers to the performance of crosses were found
significant for seed yield/planC1 and yield attributing traits.
Out of 36 cross combinations 10 showed higher magnitude
of specific combining ability effects involving high x high
(H x H) and low x high (L x H) combining ability effects
of lines and testers, respectively for seed yield/plant-1,
number of secondary branches/planc1 clusters/planc!,
number of pods plant and per cent pod setting. The
estimated standard heterosis ranged from 144.32 per .cent
(KPMS 1050 x DA 94-6) to 8.75 per cent (MS 3783 x DA
37). Out of 36 combinations, 12 registered highly significant
positive heterosis for seed yieldlplanc1 and number of
primary and secondary branches/planc1 clusters plant
and number of pods/planc1

Keywords: Pigeonpea, genetic male sterility, hybrid vigour, combining ability


Year: 2002
Volume: 62
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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