苜蓿中华根瘤菌和三叶草根瘤菌中的保守结瘤基因。
Conserved Nodulation Genes in Rhizobium meliloti and Rhizobium trifolii.
机构信息
Department of Biological Sciences, Stanford University, Stanford, California 94305.
出版信息
Appl Environ Microbiol. 1985 Jun;49(6):1432-5. doi: 10.1128/aem.49.6.1432-1435.1985.
Abstract
Plasmids which contained wild-type or mutated Rhizobium meliloti nodulation (nod) genes were introduced into NodR. trifolii mutants ANU453 and ANU851 and tested for their ability to nodulate clover. Cloned wild-type and mutated R. meliloti nod gene segments restored ANU851 to Nod, with the exception of nodD mutants. Similarly, wild-type and mutant R. meliloti nod genes complemented ANU453 to Nod, except for nodCII mutants. Thus, ANU851 identifies the equivalent of the R. meliloti nodD genes, and ANU453 specifies the equivalent of the R. meliloti nodCII genes. In addition, cloned wild-type R. trifolii nod genes were introduced into seven R. meliloti Nod mutants. All seven mutants were restored to Nod on alfalfa. Our results indicate that these genes represent common nodulation functions and argue for an allelic relationship between nod genes in R. meliloti and R. trifolii.
摘要
将含有野生型或突变的根瘤菌 meliloti 结瘤（nod）基因的质粒导入 NodR. trifolii 突变体 ANU453 和 ANU851，并测试它们在三叶草上结瘤的能力。克隆的野生型和突变型 R. meliloti nod 基因片段使 ANU851 恢复为 Nod，除了 nodD 突变体。同样，野生型和突变型 R. meliloti nod 基因使 ANU453 恢复为 Nod，除了 nodCII 突变体。因此，ANU851 鉴定出与 R. meliloti nodD 基因等效的基因，而 ANU453 指定与 R. meliloti nodCII 基因等效的基因。此外，将克隆的野生型 R. trifolii nod 基因导入到 7 个 R. meliloti Nod 突变体中。所有 7 个突变体在紫花苜蓿上均恢复为 Nod。我们的结果表明，这些基因代表了常见的结瘤功能，并证明了 R. meliloti 和 R. trifolii 中的 nod 基因之间存在等位基因关系。
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