Ammonia and amino acid transport across symbiotic membranes in nitrogen-fixing legume nodules

被引:88
作者
Day, DA [1 ]
Poole, PS
Tyerman, SD
Rosendahl, L
机构
[1] Univ Western Australia, Dept Biochem, Crawley, WA 6009, Australia
[2] Univ Reading, Sch Anim & Microbial Sci, Reading RG6 6AJ, Berks, England
[3] Flinders Univ S Australia, Sch Biol Sci, Adelaide, SA 5001, Australia
[4] Riso Natl Lab, Plant Biol & Biogeochem Dept, DK-4000 Roskilde, Denmark
关键词
legumes; rhizobia; symbiosomes; peribacteroid membrane; nitrogenase; ammonium; amino acids;
D O I
10.1007/PL00000778
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Biological nitrogen fixation involves the reduction of atmospheric N-2 to ammonia by the bacterial enzyme nitrogenase. In legume-rhizobium symbioses, the nitrogenase-producing bacteria (bacteroids) are contained in the infected cells of root nodules within which they are enclosed by a plant membrane to form a structure known as the symbiosome. The plant provides reduced carbon to the bacteroids in exchange for fixed nitrogen, which is exported to the rest of the plant. This exchange is controlled by plant-synthesised transport proteins on the symbiosome membranes. This review summarises our current understanding of these transport processes, focusing on ammonia and amino acid transport.
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收藏
页码:61 / 71
页数:11
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