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Diversification of mandarin citrus by hybrid speciation and apomixis

Author

Listed:
  • Guohong Albert Wu

    (DOE Joint Genome Institute, Lawrence Berkeley National Laboratory)

  • Chikatoshi Sugimoto

    (Okinawa Institute of Science and Technology Graduate University)

  • Hideyasu Kinjo

    (Okinawa Prefectural Agricultural Research Center, Nago Branch)

  • Chika Azama

    (Okinawa Institute of Science and Technology Graduate University)

  • Fumimasa Mitsube

    (Okinawa Prefectural Agricultural Research Center, Nago Branch)

  • Manuel Talon

    (Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias)

  • Frederick G. Gmitter

    (Citrus Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida)

  • Daniel S. Rokhsar

    (DOE Joint Genome Institute, Lawrence Berkeley National Laboratory
    Okinawa Institute of Science and Technology Graduate University
    University of California
    Chan-Zuckerberg BioHub)

Abstract

The origin and dispersal of cultivated and wild mandarin and related citrus are poorly understood. Here, comparative genome analysis of 69 new east Asian genomes and other mainland Asian citrus reveals a previously unrecognized wild sexual species native to the Ryukyu Islands: C. ryukyuensis sp. nov. The taxonomic complexity of east Asian mandarins then collapses to a satisfying simplicity, accounting for tachibana, shiikuwasha, and other traditional Ryukyuan mandarin types as homoploid hybrid species formed by combining C. ryukyuensis with various mainland mandarins. These hybrid species reproduce clonally by apomictic seed, a trait shared with oranges, grapefruits, lemons and many cultivated mandarins. We trace the origin of apomixis alleles in citrus to mangshanyeju wild mandarins, which played a central role in citrus domestication via adaptive wild introgression. Our results provide a coherent biogeographic framework for understanding the diversity and domestication of mandarin-type citrus through speciation, admixture, and rapid diffusion of apomictic reproduction.

Suggested Citation

  • Guohong Albert Wu & Chikatoshi Sugimoto & Hideyasu Kinjo & Chika Azama & Fumimasa Mitsube & Manuel Talon & Frederick G. Gmitter & Daniel S. Rokhsar, 2021. "Diversification of mandarin citrus by hybrid speciation and apomixis," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24653-0
    DOI: 10.1038/s41467-021-24653-0
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    Cited by:

    1. Adam M. Session & Daniel S. Rokhsar, 2023. "Transposon signatures of allopolyploid genome evolution," Nature Communications, Nature, vol. 14(1), pages 1-14, December.

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