2025年11月20日，
本文报道了一个泛十字花科植物SRK互作种间花粉信号（SIPS）的发现。在rapa柱头上，拟南芥和其他芸苔科植物的SIPS以BrSRK为靶点，招募雌性育性调节因子FERONIA受体激酶，增加柱头活性氧，降低种间花粉活力。拟南芥花粉未能触发种间不亲和反应。与受多态S位点控制的自交不亲和性不同，SRK的不同遗传变异与SIPS的相互作用相当。本研究确立了SIPS-SRK作为芸苔科植物特异性配体-受体对，在自交不亲和性物种中广泛维持柱头种间屏障。
研究人员表示，合子前种间不亲和性阻碍了种间杂交，限制了以野生近缘为主题的作物改良杂交策略。油菜雌性自交不亲和决定因子S-locthem受体激酶（SRK）识别种间花粉。
附：英文原文
Title: Pan-family pollen signals control an interspecific stigma barrier across Brassicaceae species
Author: Yunyun Cao, Xiaoshuang Cui, Yinqing Yang, Lianhui Pan, Fei Yang, Shuyan Li, Dandan Wu, Yuelan Ding, Rui Chen, Nan Wang, Shangjia Liu, Zhaojing Ji, Yuxuan Zhao, Yue Chen, Rui Sun, Shiyu Xian, Lin Yang, Jiyun Hui, Ru Li, Tong Zhang, Shengwei Dou, Gengxing Song, Xiaochun Wei, Yuxiang Yuan, XiaoWei Zhang, Mingming Chen, Xihai Sun, Hen-Ming Wu, Alice Y. Cheung, Qiaohong Duan
Issue&Volume: 2025-11-20
Abstract: Pre-zygotic interspecific incompatibility prevents hybridization between species limiting interbreeding strategies for crop improvement using wild relatives. The Brassica rapa female self-incompatibility determinant, S-locus receptor kinase (SRK), recognizes interspecific pollen. Here we report the discovery of a pan-Brassicaceae SRK-interacting Interspecific Pollen Signal (SIPS). On B. rapa stigmas, SIPSs from Arabidopsis and other Brassicaceae species target BrSRK and recruit the female fertility regulator FERONIA receptor kinase to increase stigmatic reactive oxygen species and reduce interspecific pollen viability. Arabidopsis sips pollen failed to trigger the interspecific incompatibility responses. Unlike self-incompatibility, which is controlled by the polymorphic S locus, different genetic variants of SRK interacted comparably with SIPS. This study establishes SIPS-SRK as a Brassicaceae-specific ligand-receptor pair that broadly maintains the stigmatic interspecific barrier in self-incompatible species.
DOI: ady2347
Source: https://www.science.org/doi/10.1126/science.ady2347