2025-04-21 愛媛大学
＜関連情報＞
- https://www.ehime-u.ac.jp/data_relese/pr_20250421_agr/
- https://www.ehime-u.ac.jp/wp-content/uploads/2025/04/pr_20250421_agr.pdf
- https://www.nature.com/articles/s42003-025-08018-7/figures/1
花粉滲出時の「Roly-poly toy」運動は、イネにおける花粉の迅速な付着を促進する ‘Roly-poly toy’ motion during pollen exudation promotes rapid pollen adhesion in rice
Hiroshi Wada,Yuto Hatakeyama,Rosa Erra-Balsells,Takumi Muneta,Hiroshi Nonami,Hikari Ueda,Yoko Yamaga-Hatakeyama,Naoya Miyashita & Takuya Araki
Communications Biology Published:18 April 2025
DOI:https://doi.org/10.1038/s42003-025-08018-7
Abstract
In angiosperm, successful pollen adhesion and hydration on the stigma are essential for pollen germination and tube elongation. Self-pollinated grass plants, such as rice, exhibit viscous ‘pollen exudation’ prior to adhesion; however, its cellular dynamics, including their chemical composition, remain unknown. Here, we revisit pollen exudation in rice to find that pollen grains showed ‘Roly-poly toy’-like rocking motion on the exudates to lead pollen adhesion. Single-cell metabolomics revealed that exudates were composed of high content of sugar together with fatty acids and redox-related metabolites, different from mature pollen grains and stigma cells. And hence, these solutes might participate in osmotic and molecular signaling in stigmatic apoplast, increasing the fluid viscosity. Taken together, it is concluded that the unique behaviour observed in rice pollen grains might play a crucial role on optimal self-positioning and adhesion prior to pollen germination, resulting in the rapid self-pollination.
