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文献推荐-根瘤菌-植物共生体中细菌氨代谢的关键作用

已有 4527 次阅读 2007-11-22 23:17 |个人分类:根瘤菌研究最新进展

Key Role of Bacterial NH4+ Metabolism in Rhizobium-Plant Symbiosis

发表在:Microbiology and Molecular Biology Reviews, June 2002, p. 203-222, Vol. 66, No. 2

Summary

Symbiotic nitrogen fixation is carried out in specialized organs, the nodules, whose formation is induced on leguminous host plants by bacteria belonging to the family Rhizobiaceae. Nodule development is a complex multistep process, which requires continued interaction between the two partners and thus the exchange of different signals and metabolites. NH4+ is not only the primary product but also the main regulator of the symbiosis: either as ammonium and after conversion into organic compounds, it regulates most stages of the interaction, from the production of nodule inducers to the growth, function, and maintenance of nodules. This review examines the adaptation of bacterial NH4+ metabolism to the variable environment generated by the plant, which actively controls and restricts bacterial growth by affecting oxygen and nutrient availability, thereby allowing a proficient interaction and at the same time preventing parasitic invasion. We describe the regulatory circuitry responsible for the downregulation of bacterial genes involved in NH4+ assimilation occurring early during nodule invasion. This is a key and necessary step for the differentiation of N2-fixing bacteroids (the endocellular symbiotic form of rhizobia) and for the development of efficient nodules.

原文下载:Key Role of Bacterial NH4+ Metabolism in Rhizobium-Plant Symbiosis



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