IDENTIFICATION OF FERTILITY RESTORERS / STERILITY MAINTAINERS AND ASSESSMENT OF COMBINING ABILITY AND HETEROSIS OF UNTESTED INBRED LINES IN SUNFLOWER (Helianthus annuus L.)
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Date
2019-08-03
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BANGALORE
Abstract
An investigation was carried out to study the sterility maintenance and fertility
restoration behaviour of 17 new inbred lines on three CMS lines and also to estimate the
combining ability and heterosis by crossing the parents in Line × Tester mating design
during Rabi summer 2017-18. The resultant 12 fertile hybrids among the generated 51
hybrids, parents and four checks viz., KBSH 41, KBSH 42, KBSH 44 and KBSH 53 were
evaluated in augmented design during Kharif 2018. Four inbred lines viz., GMU 411,
GMU 441, K 3 and A 7 were recognized as fertility restorers. While, six inbred lines
GMU 342, GMU 362, GMU 379, GMU 400, GMU 423 and GMU 426 were recognized
as prevalent sterility maintainers for all three CMS lines. The 20 parents were classified
into three clusters by following ‘k-means’ clustering method and cluster means were
highly significant for most of the traits, implying diversity among the cluster groups. The
line NDCMS 2A and the tester K 3 were identified as good general combiner for seed
yield and its component traits. The cross combinations CMS 903A × GMU 411 and
NDCMS 2A × GMU 411 were highly heterotic for seed yield and its attributing traits
over the standard checks. Hence these hybrids could be further evaluated at multilocation
trial for commercial cultivation.
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