华东师范大学李超团队破解植物亲和花粉授粉机制。2021年4月9日，国际知名学术期刊《科学》发表了这一成果。

研究人员发现，在拟南芥中的ANJ-FER（ANJEA-FERONIA）受体激酶复合物能感知到快速碱化因子肽RALF23和RALF33诱导柱头乳突中的活性氧（ROS）产生，而授粉则减少了ROS，实现花粉水合作用。授粉后，花粉表面蛋白B类肽（PCP-Bs）与RALF23/33竞争结合ANJ-FER复合物，从而导致促进花粉水合作用的ROS减少。

这些结果阐明了一种分子门控机制——来自花粉的不同肽类与柱头肽竞争跟柱头受体激酶复合物的相互作用，从而实现花粉水合并发芽。 

据介绍，被子植物的有性生殖依赖于花粉和雌蕊之间的精确交流。这些通讯基础的分子机制仍然难以捉摸。 

附：英文原文

Title: Pollen PCP-B peptides unlock a stigma peptide–receptor kinase gating mechanism for pollination

Author: Chen Liu, Lianping Shen, Yu Xiao, David Vyshedsky, Chao Peng, Xiang Sun, Zhiwen Liu, Lijun Cheng, Hua Zhang, Zhifu Han, Jijie Chai, Hen-Ming Wu, Alice Y. Cheung, Chao Li

Issue&Volume: 2021/04/09

Abstract: Sexual reproduction in angiosperms relies on precise communications between the pollen and pistil. The molecular mechanisms underlying these communications remain elusive. We established that in Arabidopsis, a stigmatic gatekeeper, the ANJEA–FERONIA (ANJ–FER) receptor kinase complex, perceives the RAPID ALKALINIZATION FACTOR peptides RALF23 and RALF33 to induce reactive oxygen species (ROS) production in the stigma papillae, whereas pollination reduces stigmatic ROS, allowing pollen hydration. Upon pollination, the POLLEN COAT PROTEIN B-class peptides (PCP-Bs) compete with RALF23/33 for binding to the ANJ–FER complex, leading to a decline of stigmatic ROS that facilitates pollen hydration. Our results elucidate a molecular gating mechanism in which distinct peptide classes from pollen compete with stigma peptides for interaction with a stigmatic receptor kinase complex, allowing the pollen to hydrate and germinate.

DOI: 10.1126/science.abc6107

Source: https://science.sciencemag.org/content/372/6538/171