Study of combining ability and effects of CMS sources on the performance of hybrids in pearl millet (Pennisitum glaucum (L.) R. Br.)
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Date
2006
Authors
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Publisher
CCSHAU
Abstract
The present investigation was carried out to study the
effect of different sources of cytoplasm on the general and specific
combining ability effects and correlation coefficient in pearl millet.
The material for the present study consisted of fourteen
male sterile lines representing five systems of male sterility viz three
from A1 source and one each from A4, A5, AG and Aegp and their
counter part as maintainer lines with six diverse testers. These 84
crosses along with two checks HHB67 and HC-20 were grown in
randomized block design with three replications during kharif 2002-03.
The observations were recorded on nine characters viz., grain yield
(g/plant), dry fodder yield (g/plant), plant height (cm), ear girth (cm),
effective tillers, leaf length (cm), ear length (cm), days to 50% flowering
and leaf width (cm).
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The analysis of variance for the design of experiment
revealed that significant genetic variability was present among crosses
for almost all the characters studied. The estimates of general
predictability ratio revealed that non-additive type of gene effects were
higher in magnitude for grain yield and its component traits except leaf
length in which additive gene effect was higher in magnitude. The
estimates of general combining ability effects revealed that lines 81Aegp
and 502AG representing Aegp and AG cytoplasmic systems combined
better for grain yield and most of its contributing traits. Testers
HTP94/54 and CSSC46-2 were top general combiners for grain yield
and majority of the component traits except effective tillers. For
effective tillers testers namely ISK-48 and H90/4-5 were good general
combiners.
The estimates of SCA effects revealed that the hybrids 81A5
x HTP94/54, 502AG x 77/29-2, 81B5 x CSSC 46-2 and 502BG x HTP
94/54 were identified as desirable crosses for grain yield and majority
of its component traits. Dry fodder yield showed positive and significant
correlation with days to 50 per cent flowering, ear length, ear girth and
grain yield. Grain yield was significant and positively correlated with
days to 50 percent flowering, effective tillers, ear length and dry fodder
yield. Implications of these results have been discussed in the present
study.