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A unique life cycle transition in the red seaweed Pyropia yezoensis depends on apospory

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Title: A unique life cycle transition in the red seaweed Pyropia yezoensis depends on apospory
Authors: Mikami, Koji Browse this author →KAKEN DB
Li, Chengze Browse this author
Irje, Ryunosuke Browse this author
Hama, Yoichiro Browse this author →KAKEN DB
Issue Date: 7-Aug-2019
Publisher: Nature Publishing Group
Journal Title: Communications biology
Volume: 2
Start Page: UNSP 299
Publisher DOI: 10.1038/s42003-019-0549-5
Abstract: Plant life cycles consist of two temporally separated stages: a haploid gametophyte and a diploid sporophyte. In plants employing a haploid-diploid sexual life cycle, the transition from sporophyte to gametophyte generally depends on meiosis. However, previous work has shown that in the red seaweed Pyropia yezoensis, this transition is independent of meiosis, though how and when it occurs is unknown. Here, we explored this question using transcriptomic profiling of P. yezoensis gametophytes, sporophytes, and conchosporangia parasitically produced on sporophytes. We identify a knotted-like homeobox gene that is predominately expressed in the conchosporangium and may determine its identity. We also find that spore-like single cells isolated from the conchosporangium develop directly into gametophytes, indicating that the gametophyte identity is established before the release of conchospores and prior to the onset of meiosis. Based on our findings, we propose a triphasic life cycle for P. yezoensis involving production of gametophytes by apospory.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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