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World J Microbiol Biotechnol. 1996 Mar;12(2):189-202. doi: 10.1007/BF00364683.
Rhizobium, Bradyrhizobium and Azorhizobium can elicit the formation of N2-fixing nodules on the roots or stems of their leguminous host plants. The nodule formation involves several developmental steps determined by different sets of genes from both partners, the gene expression being temporally and spatially coordinated. The plant proteins that are specifically synthesised during the formation and function of the nodule are called nodulins. The nodulins that are expressed before the onset of N2 fixation are termed early nodulins. These proteins are probably involved in the infection process as well as in nodule morphogenesis rather than in nodule function. The nodulins expressed just before or during N2 fixation are termed late nodulins and they participate in the function of the nodule by creating the physiological conditions required for nitrogen fixation, ammonium assimilation and transport. In this review we will describe nodulins, nodulin genes and the relationship between nodulin gene expression and nodule development. The study of nodulin gene expression may provide insight into root-nodule development and the mechanism of communication between bacteria and host plant.
根瘤菌、慢生根瘤菌和中慢生根瘤菌可以在其豆科宿主植物的根部或茎部诱导形成固氮结瘤。结瘤的形成涉及几个由两个合作伙伴的不同基因决定的发育步骤，基因表达在时间和空间上协调一致。在结瘤的形成和功能过程中特异性合成的植物蛋白称为结瘤蛋白。在固氮作用开始之前表达的结瘤蛋白称为早期结瘤蛋白。这些蛋白可能参与感染过程以及结瘤形态发生，而不是参与结瘤功能。在固氮作用之前或期间表达的结瘤蛋白称为晚期结瘤蛋白，它们通过创造固氮、铵同化和运输所需的生理条件来参与结瘤的功能。在这篇综述中，我们将描述结瘤蛋白、结瘤蛋白基因以及结瘤蛋白基因表达与结瘤发育之间的关系。对结瘤蛋白基因表达的研究可以深入了解根瘤发育和细菌与宿主植物之间的通讯机制。
