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

Myint Zin Mar, Yohei Koide, Mei Ogata, Daichi Kuniyoshi, Yoshiki Tokuyama, Kiwamu Hikichi, Mitsuhiro Obara and Yuji Kishima
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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

Agriculture, 2021, vol. 11, issue 3, 1-10

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.

Keywords: rice; Oryza glaberrima; hybrid sterility; transmission ratio distortion; reproductive barrier (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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