Genetic studies on the interspecific cytoplasm substitution lines of an Asian perennial strain of Oryza rufipogon Griff. and O. glaberrima Steud

It is shown that the restorer gene Rf sub(j) extracted from the Japanese rice variety Akebono is effective on pollen restoration in the cytoplasm substitution line having the nucleus of Oryza glaberrima) and japonica or indica cytoplasm of O. sativa , and is of the sporophytic type. Plants of the lines resemble morphologically the recurrent parent, but do not show pollen restoration, indicating that the cytoplasm of the refipogon strain induced male sterility and that the gene Rf sub(j) does not act as the restorer.