GENETIC CHARACTERIZATION OF NEW CMS LINES OF RICE (Oryza sativa L.) FOR THEIR POTENTIAL IN HYBRID RICE BREEDING PROGRAMME
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Date
2009-07-20
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University of Agricultural Sciences GKVK, Bangalore
Abstract
An investigation was carried out at Zonal Agricultural Research Station, V.C Farm, Mandya
during summer 2009 to study the morphological and floral characters of nine new CMS lines. Among
them, KCMS 29A, KCMS 31A, KCMS 33A, KCMS 35A and KCMS 37A were promising with
ideal morphological and floral traits. Using these nine CMS lines and eleven testers ninety nine
hybrids were generated and when evaluated based on spikelet fertility of corresponding hybrids, the
testers MSN-62, MSN-20-13, MSN-63, MSN-64 and MSN-68 were identified as good maintainers
while, KMR 3, KMR 4 and MSN 67 as good restorers.
Analysis of variance for combining ability indicated that, the CMS lines KCMS 33A, KCMS
37A and CRMS 31A, and the testers KMR-3, KMR-4 and MSN-67 had high overall GCA. Higher
magnitude of SCA compared to GCA indicated the predominance of non-additive gene action for all
the nine traits under study. The conditional probability of a cross having high overall sca status was
0.39 when both parents had high gca effect and when one of the parents had high gca effect it was
0.34. The per cent contribution of testers was more compared to CMS lines towards the expression of
traits like seed yield per plant (54.44), plant height (48.54), grain L/B ratio (42.74) and 1000 grain
weight (42.11).
Six hybrid combinations with better specific combining ability exhibited significantly high
standard heterosis over the check hybrid KRH 2 for seed yield per plant. They were KCMS
31A/KMR-3 (46.35%), CRMS 31A/KMR-3 (29.58%), KCMS 33A/KMR-4 (29.30%), CRMS
31A/KMR-4 (13.14%), KCMS 34A/Thanu (12.00%) and KCMS 37A/Thanu (9.54%).
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