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A two-locus interaction causes interspecific hybrid weakness in rice

Author

Listed:
  • Chen Chen

    (National Key Laboratory of Plant Molecular Genetics, National Center for Plant Gene Research (Shanghai), Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences)

  • Hao Chen

    (National Key Laboratory of Plant Molecular Genetics, National Center for Plant Gene Research (Shanghai), Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences)

  • You-Shun Lin

    (Centre for Cell and Developmental Biology, School of Life Sciences, Chinese University of Hong Kong, Shatin, New Territories)

  • Jin-Bo Shen

    (Centre for Cell and Developmental Biology, School of Life Sciences, Chinese University of Hong Kong, Shatin, New Territories)

  • Jun-Xiang Shan

    (National Key Laboratory of Plant Molecular Genetics, National Center for Plant Gene Research (Shanghai), Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences)

  • Peng Qi

    (National Key Laboratory of Plant Molecular Genetics, National Center for Plant Gene Research (Shanghai), Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences)

  • Min Shi

    (National Key Laboratory of Plant Molecular Genetics, National Center for Plant Gene Research (Shanghai), Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences)

  • Mei-Zhen Zhu

    (National Key Laboratory of Plant Molecular Genetics, National Center for Plant Gene Research (Shanghai), Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences)

  • Xue-Hui Huang

    (National Center for Gene Research, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences)

  • Qi Feng

    (National Center for Gene Research, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences)

  • Bin Han

    (National Center for Gene Research, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences)

  • Liwen Jiang

    (Centre for Cell and Developmental Biology, School of Life Sciences, Chinese University of Hong Kong, Shatin, New Territories)

  • Ji-Ping Gao

    (National Key Laboratory of Plant Molecular Genetics, National Center for Plant Gene Research (Shanghai), Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences)

  • Hong-Xuan Lin

    (National Key Laboratory of Plant Molecular Genetics, National Center for Plant Gene Research (Shanghai), Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences)

Abstract

Reproductive barriers perform a vital role during speciation. Hybrid weakness, the poorer development of hybrids compared with their parents, hinders gene exchange between different species at the postzygotic stage. Here we show that two incompatible dominant loci (Hwi1 and Hwi2) involving three genes are likely to determine the high temperature-dependent expression of hybrid weakness in interspecific hybrids of rice. Hwi1 comprises two leucine-rich repeat receptor-like kinase (LRR–RLK) genes, 25L1 and 25L2, which are specific to wild rice (Oryza rufipogon) and induce hybrid weakness. Hwi2, a rare allele that is predominantly distributed in indica rice (Oryza sativa), encodes a secreted putative subtilisin-like protease. Functional analysis indicated that pyramiding of Hwi1 and Hwi2 activates the autoimmune response in the basal nodes of hybrids, interrupting root formation and then impairing shoot growth. These findings bring new insights into our understanding of reproductive isolation and may benefit rice breeding.

Suggested Citation

  • Chen Chen & Hao Chen & You-Shun Lin & Jin-Bo Shen & Jun-Xiang Shan & Peng Qi & Min Shi & Mei-Zhen Zhu & Xue-Hui Huang & Qi Feng & Bin Han & Liwen Jiang & Ji-Ping Gao & Hong-Xuan Lin, 2014. "A two-locus interaction causes interspecific hybrid weakness in rice," Nature Communications, Nature, vol. 5(1), pages 1-11, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4357
    DOI: 10.1038/ncomms4357
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