A new type of cell related to organ movement for selfing in plants  

作　　者：Yin-Zheng Wang Yan-Xiang Lin Qi Liu Jing Liu Spencer C.H.Barrett 

机构地区：[1]State Key Laboratory of Systematic and Evolutionary Botany,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China [2]China National Botanical Garden,Beijing 100093,China [3]College of Life Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [4]Department of Ecology and Evolutionary Biology,University of Toronto,Toronto,Ontario M5S 3B2,Canada [5]College of Pharmacy,Fujian University of Traditional Chinese Medicine,Fuzhou 350122,China

出　　处：《National Science Review》2023年第9期184-197,共14页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foun-dation of China(31970239,32170228 and 31530003);the K.C.Wong Education Foundation(GJTD-2020-05).

摘　　要：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.

关 键 词：stigma movement rough endoplasmic reticulum contractile cells circadian moisture changes reproductive transition 

分 类 号：Q942[生物学—植物学]