Combining ability for resistance to rice yellow mottle virus disease in interspecific and intraspecific rice Genotypes
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Date
2015
Journal Title
Journal ISSN
Volume Title
Publisher
African Journal of Crop Science
Abstract
Estimates of combining ability for resistance to rice yellow mottle virus disease (RYMV) were obtained in
the green house of National Crops Resources Research Institute, Uganda. The study involved forty-one
F2’s diallel crosses and their five intraspecific and four interspecific parental lines. Effects of both general
combining ability (GCA) and specific combining ability (SCA) for RYMV reactions were significant, with a
preponderance of GCA effects. Of parental lines used in this study, Naric 1, Nerica 6 and WAC 116 were
good combiners for transferring resistance genes to their progenies. In this study, most genotypes with
good resistance were good general combiners expect Gigante, that despite its good mean performance,
combined badly for resistance to RYMV. The crosses with the best resistance were Naric 1x Gigante, Naric
1x Nerica 6, Nerica 6 x Nerica 4 and Nerica 1 x Nerica 6. From this study, we suggest that selection of
parents as donors for resistance should consider both GCA and parental performance. On the basis of
predominant additive genetic effects observed in the present study, we believe that combinations of
interspecific parents may be used to produce rice varieties resistant to RYMV, and that selection in early
selfing generations should be effective.
Description
Keywords
Rice, Resistance, Yellow mottle virus, Combining ability, GCA, SCA
Citation
Munganyinka, E., Edema, R., Lamo, J., Gibson, P., & Rukundo, P. (2015). Combining ability for resistance to rice yellow mottle virus disease in interspecific and intraspecific rice genotypes. Afr. J. Crop Sci, 3, 102-107.