HETEROSIS AND COMBINING ABILITY STUDIES USING NEW INBRED LINES IN SUNFLOWER (Helianthus annuus L.)
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Date
2007-12-22
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BANGALORE
Abstract
By adopting L x T mating design, 50 sunflower hybrids were generated using 25
new inbred lines and two CMS lines. The study was undertaken to identify the fertility
restorers, sterility maintainers and to assess the combining ability and heterosis for yield
and yield attributing traits. Four out of 25 new inbred lines viz., R 107, R HQ R 120 and
DRSI 549 behaved as common restorers for both CMS 135A and CMS 275A Few
inbreds behaved differentially in the two nuclear backgrounds with respect to fertility
restoration and stenlity maintenance suggesting the presence of modifying genes thus
resulting in partial fertility. The line CMS 135A was identified as the best general
combiner for majority of traits. The testers DRSI 538 and R 116 transmitted alleles with
additive effects for seed yield, oil content and oil yield. While DRSI 527 was a good
general combiner for earliness, plant height and volume weight. Among the hybrids CMS
11 35A X DRSI 610 was a goosdp escpiefciicf icco cmobmibnienre fro fro rs eoeild cyoinetledn ta.nd oil yield. While, CMS
The predominance of non additive gene action was observed for all the twelve
characters studied viz., days to 50 per cent flowering, days to maturity, plant height(cm)
head diameter(cm), stem diameter(cm), seed yield(g/plant), seed yield(kgfiia), volume
weight(^lOOcc), test weight(g), hull content(%), oil content(%), and oil yield(kgfiia).
Proportional contribution of testers to yield was predominant for characters plant height
stem diameter, volume weight, seed yield, hull content, oil content and oil yield. Hybrids
CMS 275A X R 120, CMS 135A x DRSI 610 and CMS 135A x R 120 revealed high
sigmficant heterosis for seed yield and oil yield. While the cross combination CMS 135A
X DRSI 610, CMS 135A x DRSI 549 and CMS 275A x R 107 registered desired
heterosis over checks S 275 and KBSH 44 for oil content. Among the hybrids CMS 135A
X DRSI 110 and CMS 275A x DRSI 549 manifested very high self fertility. Results from
the present study suggest the possible utility of the selected lines in heterosis breeding
programme.
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