| 摘要: |
| 根瘤菌能够合成群体感应(quorum sensing,QS)信号分子——酰基高丝氨酸内酯（N-acyl homoserine lactone，AHL）类化合物，其在与豆科植物共生结瘤的过程中，以群体密度依赖的方式通过AHLs诱导相关基因的表达。目前，根瘤菌QS系统的研究结果主要来自根瘤菌属和中华根瘤菌属。不同根瘤菌中的QS系统明显不同，它们对共生过程的影响有很大区别。同时，寄主植物也能通过分泌AHLs类似物等方式介导根瘤菌QS系统的表达。本文在简要介绍革兰氏阴性菌群体感应系统的基础上，综述了不同根瘤菌群体感应系统的类型及其对共生结瘤的影响，以及豆科植物对群体感应系统的响应等方面的研究进展，并对当前根瘤菌与豆科植物共生互作早期QS系统功能研究中存在的问题及今后的研究方向进行了分析与展望。 |
| 关键词: 根瘤菌 群体感应 共生互作 基因表达 豆科植物 |
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| 基金项目:陕西省自然科学基金项目(2009JM3011)；西北农林科技大学基本科研业务费专项(QN2009068) |
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| Role of quorum sensing in Rhizobium-legume symbiotic interactions |
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| Abstract: |
| Rhizobia can produce N-acyl homoserine lactones (AHLs),which regulate the induction of gene expression involved in symbiotic nodulation with legumes in a population-density-dependent manner.Till now,the study of quorum-sensing systems in rizobia is mainly focused on Rhizobiumand Sinorhizobium.There is significant diversity in the types of quorum-sensing regulatory systems that are present in different rhizobia and distinct difference in effects on Rhizobium -legume symbiotic interactions.The host legumes also secrete AHL-like compounds interfering with the rhizobial quorum-sensing systems.In this article,the quorum-sensing system of Gram negative bacteria was introduced.The diversity of quorum-sensing regulation in rhizobia and its role in symbiotic interactions with legumes were detailed.The responding of host plant to this signalling system was also reviewed.The present research problems and reflection in the field were discussed. |
| Key words: rhizobium quorum sensing symbiotic interaction gene expression legume |
