McCubbin A G, Kao T
Department of Biochemistry and Molecular Biology, 403 Althouse Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802-4500, USA.
Annu Rev Cell Dev Biol. 2000;16:333-64. doi: 10.1146/annurev.cellbio.16.1.333.
Many bisexual flowering plants possess a reproductive strategy called self-incompatibility (SI) that enables the female tissue (the pistil) to reject self but accept non-self pollen for fertilization. Three different SI mechanisms are discussed, each controlled by two separate, highly polymorphic genes at the S-locus. For the Solanaceae and Papaveraceae types, the genes controlling female function in SI, the S-RNase gene and the S-gene, respectively, have been identified. For the Brassicaceae type, the gene controlling male function, SCR/SP11, and the gene controlling female function, SRK, have been identified. The S-RNase based mechanism involves degradation of RNA of self-pollen tubes; the S-protein based mechanism involves a signal transduction cascade in pollen, including a transient rise in [Ca(2+)]i and subsequent protein phosphorylation/dephosphorylation; and the SRK (a receptor kinase) based mechanism involves interaction of a pollen ligand, SCR/SP11, with SRK, followed by a signal transduction cascade in the stigmatic surface cell.
许多两性花植物拥有一种名为自交不亲和（SI）的繁殖策略，该策略能使雌性组织（雌蕊）排斥自身花粉，但接受非自身花粉进行受精。本文讨论了三种不同的自交不亲和机制，每种机制都由位于S位点的两个独立的、高度多态的基因控制。对于茄科和罂粟科类型，分别鉴定出了控制自交不亲和中雌性功能的基因，即S-RNase基因和S基因。对于十字花科类型，鉴定出了控制雄性功能的基因SCR/SP11和控制雌性功能的基因SRK。基于S-RNase的机制涉及自身花粉管RNA的降解；基于S蛋白的机制涉及花粉中的信号转导级联反应，包括[Ca(2+)]i的瞬时升高以及随后的蛋白质磷酸化/去磷酸化；基于SRK（一种受体激酶）的机制涉及花粉配体SCR/SP11与SRK的相互作用，随后在柱头表面细胞中发生信号转导级联反应。
