植物孢子体自交不亲和信号转导功能分子研究进展

The functional molecules of SSI signal transduction in plants

孢子体自交不亲和(SSI)是许多植物采取的一种抵制近亲繁殖的重要措施,受S位点复等位基因控制。近年来,参与其信号转导的许多功能分子及它们的编码基因被分离并得到了充分研究当自花授粉时,SP11/SCR与SRK特异识别,造成后者的Ser/Thr激酶的磷酸化,引发了一系列由SLG、ARC1及水孔蛋白等因子参与的SSI信号转导途径,最终产生自交不亲和的结果。

Sporophytic self-incompatibility(SSI) controlled sporophytically by the multiallelic S-locus is one of several mechanisms that have evolved to prevent inbreeding in plants, in Brassica, recently. Many functional molecules mediating expression of SSI reaction and their genes have been isolated and studied, which has unveiled a way of signal transduction of SSI?: SP11(S-locus protein 11) (also known as S-locus cysteine-rich protein; SCR) functions as the sole ligand for its cognate SRK (S-receptor kinase) receptor, a membrane-spanning serine/threonine kinase, which determines the S-haplotype specificity of the stigma. Their interaction induces the autophosphorylation of SRK, which is expected to trigger the signalling cascade that results in the rejection of self-pollen mediated by other factors like S-locus glycoprotein, arm repeat-containing protein 1 and aquaporin.