Various kinds of reproductive barriers have been reported in intraspecific and interspecific crosses between the AA genome species, to which Asian rice () and African rice () belong. A hybrid seed sterility phenomenon was found in the progeny of the cross between and , which is found in Northern Australia and Indonesia and has diverged from the other AA genome species. This phenomenon could be explained by an egg-killer model. Linkage analysis using DNA markers showed that the causal gene was located on the distal end of chromosome 1. Because no known egg-killer gene was located in that chromosomal region, this gene was named (abbreviated form, ). In heterozygotes, the eggs carrying the allele are killed, causing semi-sterility. This killer system works incompletely: some eggs carrying the allele survive and can be fertilized. The distribution of alleles in wild populations of was discussed from the perspective of genetic differentiation of populations.
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| http://dx.doi.org/10.3390/plants11030378 | DOI Listing |
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