ArticleProceedings of the National Academy of Sciences of the United States of America2026
A MAPK cascade regulates nuclear migration during female gametogenesis to establish specific cell identity and rice female fertility.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- The Histone Methyltransferase OsSET37 Positively Regulates Rice Seed Vigor.Physiologia plantarumArticle
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13 authors.
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Abstract
During the development of the rice female gametophyte (FG, embryo sac), there exists a free-nuclear stage wherein eight nuclei, originating from the same mother cell nucleus, respectively migrate to specific positions to acquire distinct cell identities after cellularization and develop into the egg cell, central cell, or accessory cells. Therefore, this nuclear migration stage is essential for fertilization and rice fertility. How these nuclei can find their own way to exactly move to different predetermined positions and how the two polar nuclei are selected have been intriguing questions for decades. Here, we show that a mitogen-activated protein kinase cascade, composed of OsMEKK2/OsMEKK21, OsMKK6, and OsMPK4, precisely regulates free-nuclear migration and determines the number and identities of polar nuclei. Specifically, OsMKK6 phosphorylates OsMPK4 to restrict nuclear migration at the chalazal pole, ensuring the accurate number and positioning of antipodal cells and polar nuclei. Loss-of-function mutations in
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