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Recurrent selection for specific combining ability and type of gene action involved in yield heterosis in corn



Recurrent selection for specific combining ability and type of gene action involved in yield heterosis in corn



Agron Jour 51(7): 392-394



Yield data indicating the effectiveness of recurrent selection for specific combining ability are presented. Yield increases following 2 cycles of selection were 6.5 bushels in the Lancaster and 20.0 bushels in the Kolkmeier series. The estimates of a [sigma]2p were not critical but indicated some reduction in genetic variability. Some additive genetic variance persisted after the 2 cycles of selection. Yields of the C1 composites were reduced in both the Lancaster and the Kolkmeier series. However, the yields of the C2 populations were essentially the same as those of the parental CO populations. The hybrids between CO x CO, C1 x C1, C2 x C2 exhibited increasing yield trends. The results are discussed in relation to assumptions concerning gene frequencies in the parental varietal populations. It was concluded that for the material used in this study partial and complete dominance provided the best explanation for gene action involved in yield heterosis.

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