摘要
在芸苔属植物的自交不亲和细胞信号转导过程中,信号分子-SCR配体是由花粉粒产生的,被柱头乳突细胞SRK受体识别后,进行细胞内信号转导。这对受体-配体是两个由S位点编码的且高度多态的蛋白质,它们决定着自交不亲和反应。配体是位于花粉粒表面的一个小的胞被蛋白,由SCR基因编码;受体是位于柱头乳突细胞原生质膜上的跨膜的蛋白质激酶,由SRK基因编码。在自交授粉过程中,配体SCR和受体SRK的相互作用激活了受体SRK,被激活的SRK通过其下游组分ARC1介导底物的泛肽化,然后泛肽化的底物在蛋白酶体/CSN中被降解,从而导致了自交不亲和性反应。这些降解的底物可能是促进花粉水合、萌发和花粉管生长的雌蕊亲和因子。主要针对芸苔属自交不亲和细胞信号转导作一综述。
On signal transduction of self-incompatibility in Brassica, the signal molecule-SCR ligandis produced by the pollen grain, recognized by SRK receptor in stigmatic papillae, and transducedinto a cellular response. The receptor-ligand pairs are two S locus-encoded highly polymorphicproteins that determine specificity of self-incompatibility. The ligand encoded by SCR gene is a smallpollen coat protein present on the surface of pollen grains. The receptor localized to the plasmamembrane of the stigmatic papillae on the surface of the pistil is encoded by SRK gene. During self-pollination, SCR interacts with its cognate receptor to activate SRK, which mediates the ubiquitinationof substrates by ARC1. ARC1 functions downstream of the SRK. Ubiquitinated substrates, whichmay represent pistil compatible factors and normally promote pollen hydration, germination, andtube growth, are degraded by the proteasome/CSN, there by resulting in the response of self-incompatibility. In this paper, we give a detailed review about signal transduction of self-incompat-ibility in Brassica.
出处
《植物学通报》
CAS
CSCD
北大核心
2004年第4期461-470,共10页
Chinese Bulletin of Botany
基金
国家自然科学基金面上项目"通过干扰花粉与柱头上的信息传递克服自交不亲和性"(30371189)的资助。
