ArticleNature plants2026
Ancient peptide-redox signalling underlies sperm motility in Marchantia.
Article in Nature plants, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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8 authors.
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Abstract
Sexual reproduction, a nearly universal feature of eukaryotes, begins with the fertilization of gametes. Zoidogamy, or fertilization mediated by motile spermatozoids, represents an ancestral mode predating the evolution of pollen tube-based fertilization in angiosperms. This mode dominated a long span of evolutionary history and remains widespread among early-diverging plants and animals. However, the molecular mechanisms underlying this ancient fertilization process in plants remains poorly understood. In the liverwort Marchantia polymorpha, we identify a mechanism by which the peptide hormone MpRALF1 regulates sperm motility through reactive oxygen species (ROS). The sperm-derived MpRALF1 is perceived by a receptor complex composed of the MpFERONIA receptor kinase and its co-receptor MpLLG. This signalling module activates NADPH oxidase-mediated ROS production, thereby enhancing sperm velocity and progressive motility to ensure fertilization. Our study reveals the ancient origin of RALF peptide signalling in land plants and establishes ROS as a conserved mechanism governing sperm motility across kingdoms.
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