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Complex genetic nature of sex-independent transmission ratio distortion in Asian rice species: the involvement of unlinked modifiers and sex-specific mechanisms

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Title: Complex genetic nature of sex-independent transmission ratio distortion in Asian rice species: the involvement of unlinked modifiers and sex-specific mechanisms
Authors: Koide, Yohei Browse this author
Shinya, Yuhei Browse this author
Ikenaga, Mitsunobu Browse this author
Sawamura, Noriko Browse this author
Matsubara, Kazuki Browse this author
Onishi, Kazumitsu Browse this author
Kanazawa, Akira Browse this author →KAKEN DB
Sano, Yoshio Browse this author →KAKEN DB
Keywords: rice
transmission ratio distortion
hybrid sterility
Issue Date: Mar-2012
Publisher: Nature Publishing Group
Journal Title: Heredity
Volume: 108
Issue: 3
Start Page: 242
End Page: 247
Publisher DOI: 10.1038/hdy.2011.64
Abstract: Transmission ratio distortion (TRD), in which one allele is transmitted more frequently than the opposite allele, is presumed to act as a driving force in the emergence of a reproductive barrier. TRD acting in a sex-specific manner has been frequently observed in interspecific and intraspecific hybrids across a broad range of organisms. In contrast, sex-independent transmission ratio distortion (siTRD), which results from preferential transmission of one of the two alleles in the heterozygote through both sexes, has been detected in only a few plant species. We previously reported S6 locus-mediated siTRD, in which the S6 allele from an Asian wild rice strain (Oryza rufipogon) was transmitted more frequently than the S6^[a] allele from an Asian cultivated rice strain (O. sativa) through both male and female gametes in heterozygous plants. Here, we report on the effect of a difference in genetic background on S6 locus-mediated siTRD based on the analysis using near-isogenic lines and the original wild strain as a parental strain for crossing. We found that the degree of TRD through the male gametes varied depending on the genetic background of the female (pistil) plants. Despite the occurrence of TRD through both male and female gametes, abnormality was detected in ovules, but not in pollen grains, in the heterozygote. These results suggest the involvement of unlinked modifiers and developmentally distinct, sex-specific genetic mechanisms in S6 locus-mediated siTRD, raising the possibility that siTRD driven by a single locus may be affected by multiple genetic factors harbored in natural populations.
Type: article (author version)
URI: http://hdl.handle.net/2115/49931
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 金澤 章

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