Download PDF by D S Brar; B Hardy: Advances in rice genetics

By D S Brar; B Hardy

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Pollen and spikelet fertility in F 1s and F2s derived from crosses of CMS lines (WA cytoplasm) with different restorers. 93 indicating a duplicate dominant epistasis involving two genes. Several workers have reported that fertility restoration of WA cytoplasm is controlled by two dominant genes (Zhou et al 1983, Virmani et al 1986, Govinda Raj and Virmani 1988). Of the two genes, one is stronger than the other for fertility restoration. Allelic studies between sodic-tolerant and susceptible restorers thus need to be carried out.

1984. A method to make decisions jointly on a number of dependent characters. Indian J. Genet. 44(3):419-424. S. A. A. D. Redoña Heterosis in rice has been acknowledged to be associated with the genetic divergence of the parents used in hybridization. We investigated the nature and extent of the correlation between microsatellite marker heterozygosity and heterosis for some quantitative traits in 48 three-line and 13 two-line F1 rice hybrids. The parental lines used represented the breadth of genetic diversity in the Philippine hybrid rice gene pool.

Of these 50, as many as 36 restorers appeared in the same group during both years of testing, indicating 72% reproducibility. 8%, respectively. These findings, based on 2-y data, were similar to our earlier observations (Vijayakumar et al 1999). A careful look at the hybrid evaluation data further revealed that most of the hybrids that exhibited heterosis in many test locations or over years had restorers from the medium group. Although the restorers found in the high category gave hybrid combinations with standard heterosis, their frequency was low.

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Advances in rice genetics by D S Brar; B Hardy


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