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Genetic Mapping of the Gamete Eliminator Locus, S 2 , Causing Hybrid Sterility and Transmission Ratio Distortion Found between Oryza sativa and Oryza glaberrima Cross Combination

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  • Myint Zin Mar

    (Research Faculty of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo 060-8589, Japan)

  • Yohei Koide

    (Research Faculty of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo 060-8589, Japan)

  • Mei Ogata

    (Research Faculty of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo 060-8589, Japan)

  • Daichi Kuniyoshi

    (Research Faculty of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo 060-8589, Japan)

  • Yoshiki Tokuyama

    (Research Faculty of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo 060-8589, Japan)

  • Kiwamu Hikichi

    (Research Faculty of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo 060-8589, Japan)

  • Mitsuhiro Obara

    (Japan International Research Center for Agricultural Sciences, Ohwashi 1-1, Tsukuba Ibaraki 305-8686, Japan)

  • Yuji Kishima

    (Research Faculty of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo 060-8589, Japan)

Abstract

Hybrid sterility is a reproductive barrier that prevents gene flow between species. In Oryza species, some hybrid sterility loci, which are classified as gamete eliminators, cause pollen and seed sterility and sex-independent transmission ratio distortion ( si TRD) in hybrids. However, the molecular basis of si TRD has not been fully characterized because of lacking information on causative genes. Here, we analyze one of the hybrid sterility loci, S 2 , which was reported more than forty years ago but has not been located on rice chromosomes. Hybrids between African rice ( Oryza glaberrima ) and a near-isogenic line that possesses introgressed chromosomal segments from Asian rice ( Oryza sativa ) showed sterility and si TRD, which confirms the presence of the S 2 locus. Genome-wide SNP marker survey revealed that the near-isogenic line has an introgression on chromosome 4. Further substitution mapping located the S 2 locus between 22.60 Mb and 23.54 Mb on this chromosome. Significant TRD in this chromosomal region was also observed in a calli population derived from cultured anther in hybrids of another cross combination of African and Asian rice species. This indicates that the pollen abortion caused by the S 2 locus occurs before callus induction in anther culture. It also suggests the wide existence of the S 2 -mediated si TRD in this interspecific cross combination. Chromosomal location of the S 2 locus will be valuable for identifying causative genes and for understanding of the molecular basis of si TRD.

Suggested Citation

  • Myint Zin Mar & Yohei Koide & Mei Ogata & Daichi Kuniyoshi & Yoshiki Tokuyama & Kiwamu Hikichi & Mitsuhiro Obara & Yuji Kishima, 2021. "Genetic Mapping of the Gamete Eliminator Locus, S 2 , Causing Hybrid Sterility and Transmission Ratio Distortion Found between Oryza sativa and Oryza glaberrima Cross Combination," Agriculture, MDPI, vol. 11(3), pages 1-10, March.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:3:p:268-:d:521155
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    References listed on IDEAS

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    1. Yongyao Xie & Jintao Tang & Xianrong Xie & Xiaojuan Li & Jianle Huang & Yue Fei & Jingluan Han & Shuifu Chen & Huiwu Tang & Xiucai Zhao & Dayun Tao & Peng Xu & Yao-Guang Liu & Letian Chen, 2019. "An asymmetric allelic interaction drives allele transmission bias in interspecific rice hybrids," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
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