Genetic Studies on Fertility Restoration, Heterosis and Combining Ability of Alternaria Tolerant Inbred Lines in Sunflower (Helianthus annuus L.)
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Date
2011
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UAS, Dharwad
Abstract
An experiment was conducted to know fertility restoration, heterosis and
combining ability and inheritance of Alternaria resistance adopting 12 x 8 Line x
Tester design during summer-2011. The study revealed that two hybrids were tolerant
for Alternaria disease recording grade 6 at maturity. The inbred TX16R found to be
the resistant male parent which restored fertility on most of the CMS lines except
CMS300-2A. Among the female lines FMSR265 A was moderately resistant. Two
hybrids CMS 103 A x TX 16R and PET 2-7-1Ax TX-16R showed moderate degree of
tolerance to Alternaria disease and can be involved in the breeding programme to
develop superior inbred lines. The line CMS300-2A appeared to be unique in its
diversity as a majority of the lines could not restore fertility
CMS 335Ax Tx-16R found to be a good combiner for an array of traits like
seed yield, oil yield, disease resistance and head diameter. Among the males line TX
16-R appeared as good combiner for disease resistance and host of other traits like
head diameter, per cent seed filling, volume weight and oil content. Among the 48
hybrids CMS335A x TX16R was the only cross that expressed standard heterosis for
seed yield over KBSH-44 (23.34 per cent) and oil yield (23.09 percent) over KBSH-1.
It was also found to be heterotic for the characters like days to fifty percent flowering,
days to maturity, plant height, seed filling-percentage, volume weight, hull content
and PDI at maturity. The parents CMS335A and TX16R found to be contrasting with
respect to their GCA effects for the characters showing heterotis. Most of the hybrids
showing high sca effects were the combination of parents with low x low, high x low
gca effects.
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Genetics and Plant Breeding