Abstract
General and specific combining ability effects were estimated from a 5 line × 8 tester crosses to explore the genetic behavior of CMS and restorers in rice. The variance for GCA and SCA showed predominance of non-additive gene action for all the ten morpho-physiological traits. The estimates of GCA effects revealed that none of the parent was general combiner for all the traits in desired direction. Gan46A and BR827R were good general combiners for higher grain yield coupled with earliness, and IR46R and BR168R was good general combiner for grain yield and lateness in maturity. Good x poor general combiners (Gan46A × Gui99R) for grain yield produced the best specific cross for higher grain yield coupled with earliness, longer panicle, panicles/plant, filled grains/panicle and less sterility (%). Additive × additive, additive × dominance and dominance × dominance gene interactions were involved in deriving good specific cross for grain yield.DOI: http://dx.doi.org/10.3329/bjpbg.v20i1.17013
Highlights
Grain yield of rice is the result of a series of complex morpho-physiological phenomena
Information regarding genetic control of morpho-physiological bases of grain yield is not adequate. To explore such complex processes comprehensive research relating to genetic improvement of morphophysiological traits of rice plants is required (Wazuddin and Julfiquar 2002)
Analysis of variance (ANOVA) for general combining ability (GCA) and specific combining ability (SCA) effects were estimated according to Kempthorne (1957)
Summary
Grain yield of rice is the result of a series of complex morpho-physiological phenomena. Identification of the factors responsible and their genetic control may help plant breeders to develop high yielding cultivars and help agronomists to establish suitable cultural practices. Several approaches have been reported to identify morpho-physiological bases of higher grain yield in rice (Virmani and Edwards 1983, Sunohara et al, 1985, Bashar 2002). Information regarding genetic control of morpho-physiological bases of grain yield is not adequate. To explore such complex processes comprehensive research relating to genetic improvement of morphophysiological traits of rice plants is required (Wazuddin and Julfiquar 2002). A study was undertaken to estimate the nature and magnitude of gene action and to explore suitable combination of male sterile and restorer lines with high yield potential
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