New Hybrid Spikelet Sterility Gene Found in Interspecific Cross between and .

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.