3 research outputs found
Complex genetic nature of sex-independent transmission ratio distortion in Asian rice species: the involvement of unlinked modifiers and sex-specific mechanisms
The Evolution of Sex-Independent Transmission Ratio Distortion Involving Multiple Allelic Interactions at a Single Locus in Rice
Transmission ratio distortion (TRD) is frequently observed in inter- and intraspecific hybrids of plants, leading to a violation of Mendelian inheritance. Sex-independent TRD (siTRD) was detected in a hybrid between Asian cultivated rice and its wild ancestor. Here we examined how siTRD caused by an allelic interaction at a specific locus arose in Asian rice species. The siTRD is controlled by the S6 locus via a mechanism in which the S6 allele acts as a gamete eliminator, and both the male and female gametes possessing the opposite allele (\documentclass[10pt]{article}
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\begin{equation*}S_{6}^{{\mathrm{a}}}\end{equation*}\end{document}) are aborted only in heterozygotes (\documentclass[10pt]{article}
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\begin{equation*}S_{6}/S_{6}^{{\mathrm{a}}}\end{equation*}\end{document}). Fine mapping revealed that the S6 locus is located near the centromere of chromosome 6. Testcross experiments using near-isogenic lines (NILs) carrying either the S6 or \documentclass[10pt]{article}
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\begin{equation*}S_{6}^{{\mathrm{a}}}\end{equation*}\end{document} alleles revealed that Asian rice strains frequently harbor an additional allele (\documentclass[10pt]{article}
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\begin{equation*}S_{6}^{{\mathrm{n}}}\end{equation*}\end{document}) the presence of which, in heterozygotic states (\documentclass[10pt]{article}
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\begin{equation*}S_{6}/S_{6}^{{\mathrm{n}}}\end{equation*}\end{document} and \documentclass[10pt]{article}
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\begin{equation*}S_{6}^{{\mathrm{a}}}/S_{6}^{{\mathrm{n}}}\end{equation*}\end{document}), does not result in siTRD. A prominent reduction in the nucleotide diversity of S6 or \documentclass[10pt]{article}
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\begin{equation*}S_{6}^{{\mathrm{a}}}\end{equation*}\end{document} carriers relative to that of \documentclass[10pt]{article}
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\begin{equation*}S_{6}^{{\mathrm{n}}}\end{equation*}\end{document} carriers was detected in the chromosomal region. These results suggest that the two incompatible alleles (S6 and \documentclass[10pt]{article}
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\begin{equation*}S_{6}^{{\mathrm{a}}}\end{equation*}\end{document}) arose independently from \documentclass[10pt]{article}
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\begin{equation*}S_{6}^{{\mathrm{n}}}\end{equation*}\end{document} and established genetically discontinuous relationships between limited constituents of the Asian rice population