大豆根瘤菌共生 DNA 区的保守性。

Mikrobiologisches Institut, Eidgenössische Technische Hochschule, ETH-Zentrum, CH-8092 Zurich, Switzerland.

Appl Environ Microbiol. 1987 Sep;53(9):2253-5. doi: 10.1128/aem.53.9.2253-2255.1987.

Bradyrhizobium japonicum USDA 3I1b110 contains a DNA region in which symbiotic genes and many repeated sequences are closely linked. Hybridization analysis revealed that this region was highly conserved in some B. japonicum strains (USDA 24, USDA 122, USDA 123, ATCC 10324, 61A24) but not in others (USDA 76, 61A76, 61A101). The genomic presence of multiple copies of one of the repeated sequences (RSalpha) appeared to be specifically characteristic for soybean root nodule bacteria, including the fast-growing Rhizobium fredii, which carries most of these RSalpha copies on the symbiotic plasmid.

大豆慢生根瘤菌 USDA 3I1b110 含有一个 DNA 区域，其中共生基因和许多重复序列紧密相连。杂交分析显示，该区域在一些大豆慢生根瘤菌菌株（USDA 24、USDA 122、USDA 123、ATCC 10324、61A24）中高度保守，但在其他菌株（USDA 76、61A76、61A101）中则不然。一个重复序列（RSalpha）的多个拷贝在基因组中的存在似乎是大豆根瘤菌的一个特有特征，包括快速生长的弗雷氏根瘤菌，它将大部分这些 RSalpha 拷贝携带在共生质粒上。