Abhinandan Kumar, Sankaranarayanan Subramanian, Macgregor Stuart, Goring Daphne R, Samuel Marcus A
University of Calgary, Department of Biological Sciences, Calgary, Alberta T2N 1N4, Canada; 20/20 Seed Labs Inc., Nisku, Alberta T9E 7N5, Canada.
Purdue Center for Plant Biology, Purdue University, West Lafayette, IN 47907, USA.
Trends Plant Sci. 2022 May;27(5):472-487. doi: 10.1016/j.tplants.2021.10.011. Epub 2021 Nov 27.
Self-incompatibility (SI) is a mechanism that many plant families employ to prevent self-fertilization. In the Brassicaceae, the S-haplotype-specific interaction of the pollen-borne ligand, and a stigma-specific receptor protein kinase triggers a signaling cascade that culminates in the rejection of self-pollen. While the upstream molecular components at the receptor level of the signaling pathway have been extensively studied, the intracellular responses beyond receptor activation were not as well understood. Recent research has uncovered several key molecules and signaling events that operate in concert for the manifestation of the self-incompatible responses in Brassicaceae stigmas. Here, we review the recent discoveries in both the compatible and self-incompatible pathways and provide new perspectives on the early stages of Brassicaceae pollen-pistil interactions.
自交不亲和性（SI）是许多植物科用来防止自花受精的一种机制。在十字花科中，花粉携带的配体与柱头特异性受体蛋白激酶的S单倍型特异性相互作用触发信号级联反应，最终导致自花花粉被排斥。虽然信号通路受体水平的上游分子成分已得到广泛研究，但受体激活后的细胞内反应却不太清楚。最近的研究发现了几个关键分子和信号事件，它们协同作用，导致十字花科柱头出现自交不亲和反应。在这里，我们综述了亲和与自交不亲和途径的最新发现，并对十字花科花粉与雌蕊相互作用的早期阶段提供了新的见解。
