The persimmon genome reveals clues to the evolution of a lineage-specific sex determination system in plants

Autoři: Takashi Akagi aff001;  Kenta Shirasawa aff003;  Hideki Nagasaki aff003;  Hideki Hirakawa aff003;  Ryutaro Tao aff004;  Luca Comai aff005;  Isabelle M. Henry aff005
Působiště autorů: Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan aff001;  Japan Science and Technology Agency (JST), PRESTO, Kawaguchi-shi, Saitama, Japan aff002;  Kazusa DNA Research Institute, Kazusa-Kamatari, Kisarazu, Chiba, Japan aff003;  Graduate School of Agriculture, Kyoto University, Kyoto, Japan aff004;  Genome Center and Department of Plant Biology, University of California Davis, Davis, California, United States of America aff005;  Genome Center and Department, Plant Biology, University of California Davis, Davis, California, United States of America aff005
Vyšlo v časopise: The persimmon genome reveals clues to the evolution of a lineage-specific sex determination system in plants. PLoS Genet 16(2): e32767. doi:10.1371/journal.pgen.1008566
Kategorie: Research Article
doi: 10.1371/journal.pgen.1008566


Most angiosperms bear hermaphroditic flowers, but a few species have evolved outcrossing strategies, such as dioecy, the presence of separate male and female individuals. We previously investigated the mechanisms underlying dioecy in diploid persimmon (D. lotus) and found that male flowers are specified by repression of the autosomal gene MeGI by its paralog, the Y-encoded pseudo-gene OGI. This mechanism is thought to be lineage-specific, but its evolutionary path remains unknown. Here, we developed a full draft of the diploid persimmon genome (D. lotus), which revealed a lineage-specific whole-genome duplication event and provided information on the architecture of the Y chromosome. We also identified three paralogs, MeGI, OGI and newly identified Sister of MeGI (SiMeGI). Evolutionary analysis suggested that MeGI underwent adaptive evolution after the whole-genome duplication event. Transformation of tobacco plants with MeGI and SiMeGI revealed that MeGI specifically acquired a new function as a repressor of male organ development, while SiMeGI presumably maintained the original function. Later, a segmental duplication event spawned MeGI’s regulator OGI on the Y-chromosome, completing the path leading to dioecy, and probably initiating the formation of the Y-chromosome. These findings exemplify how duplication events can provide flexible genetic material available to help respond to varying environments and provide interesting parallels for our understanding of the mechanisms underlying the transition into dieocy in plants.

Klíčová slova:

Arabidopsis thaliana – Flowering plants – Flowers – Gene mapping – Genome analysis – Lotus – Plant genomics – Sequence alignment


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