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千山位于辽宁省的中部,其气候和地形地貌较为独特,豆科植物分布广泛。在1992年-1995年间,我们共采集32株根瘤菌样品,包括9个属13个种豆科植物。通过研究发现,根瘤菌与气候条件和地形地貌有很大的关系,为根瘤菌的资源调查和开发利用提供科学依据。 相似文献
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Ammonia and amino acid transport across symbiotic membranes in nitrogen-fixing legume nodules 总被引:8,自引:0,他引:8
Day DA Poole PS Tyerman SD Rosendahl L 《Cellular and molecular life sciences : CMLS》2001,58(1):61-71
Biological nitrogen fixation involves the reduction of atmospheric N2 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.
Received 5 June 2000; revised 13 July 2000; accepted 14 July 2000 相似文献
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