Summary
Interspecific cytoplasm substitution lines of Oryza sativa and O. glaberrima, i.e. (sativa)-glaberrima and (glaberrima)-sativa, have been bred by means of successive backcrosses, using three japonica varieties of sativa and two glaberrima strains.
In all the six substitution lines with the cytoplasm of the glaberrima strains, the fertility increased with succeeding backcrosses, and eventually completely fertile plants whith the characteristics of the parental japonica variety appeared. This indicates that the glaberrima cytoplasm exerted no effect on the genome manifestation of these japonica varieties. Of the five substitution lines with the cytoplasm of each of the japonica varieties, four lines produced male sterile (M.S.) plants only in the backcross generations. In the remaining substitution line with the cytoplasm of the japonica variety Akebono, there was simultaneous segregation for male sterile (M.S.) and pollen fertile plants bearing indehiscent anthers (ID.M.F.) in the backcross generations. In the compulsively selfed progeny of ID.M.F. plants, pollen fertile plants with dehiscent anthers (D.M.F.) occurred with M.S- and ID.M.F. plants. Morphologically, these three types were supposed to have the same genetic background as the glaberrima parent. It was established that D.M.F.-and ID.M.F. plants were homozygous and heterozygous for a dominant nuclear gene restoring pollen fertility, respectively, and the M.S. plants and the two glaberrima strains used in this study carried a recessive gene for pollen sterility in homozygous condition. The restorer gene was assumed to derive from the japonica variety Akebono. The expression of the restorer gene was of the sporophytic type. The pollen sterility of the substitution lines that possessed the cytoplasm of the japonica varieties was of cytoplasmon-genic nature.
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Yabuno, T. Genetic studies on the interspecific cytoplasm substitution lines of japonica varieties of Oryza sativa L. and O. glaberrima Steud. . Euphytica 26, 451–463 (1977). https://doi.org/10.1007/BF00027007
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DOI: https://doi.org/10.1007/BF00027007