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- Title
A new type of cell related to organ movement for selfing in plants.
- Authors
Wang, Yin-Zheng; Lin, Yan-Xiang; Liu, Qi; Liu, Jing; Barrett, Spencer C H
- Abstract
Many plants employ osmotic and hydrostatic pressure to generate movement for survival, but little is known about the cellular mechanisms involved. Here, we report a new cell type in angiosperms termed 'contractile cells' in the stigmas of the flowering plant Chirita pumila with a much-expanded rough endoplasmic reticulum (RER). Cryo-scanning electron microscopy and transmission electron microscopy analyses revealed that the RER is continuously distributed throughout the entirety of cells, confirmed by endoplasmic reticulum (ER)-specific fluorescent labeling, and is distinct from the common feature of plant ER. The RER is water-sensitive and extremely elongated with water absorption. We show that the contractile cells drive circadian stigma closing–bending movements in response to day-to-night moisture changes. RNA-seq analyses demonstrated that contractile cells have distinct molecular components. Furthermore, multiple microstructural changes in stigma movements convert an anti-selfing structure into a device promoting selfing—a unique cellular mechanism of reproductive adaptation for uncertain pollination environments.
- Subjects
TRANSMISSION electron microscopy; ENDOPLASMIC reticulum; OSMOTIC pressure; HYDROSTATIC pressure; FLOWERING of plants
- Publication
National Science Review, 2023, Vol 10, Issue 9, p1
- ISSN
2095-5138
- Publication type
Article
- DOI
10.1093/nsr/nwad208