Recombinant DNA clones containing a broad host range gene from
Bradyrhizobium japonicum
    1.
    发明授权
    Recombinant DNA clones containing a broad host range gene from Bradyrhizobium japonicum 失效
    重组DNA克隆含有广泛的宿主范围基因从日本的Bradyrhizobium日本+ B

    公开(公告)号:US4966847A

    公开(公告)日:1990-10-30

    申请号:US78339

    申请日:1987-07-27

    摘要: Recombinant DNA clones according to the invention contain a host range gene of B. japonicum which is contained within a 3.3 kb HindIII restriction fragment from the B. japonicum chromosome. Mutations to this gene change the ability of the bacteria to nodulate different plants. In one example, a Tn5 insertion to this region caused the strain to lose its ability to nodulate siratro, but nodulation of soybeans was unaffected. This gene may be manipulated to extend or restrict the host range of the strain for agricultural purposes.

    摘要翻译: 根据本发明的重组DNA克隆含有日本粳稻的宿主范围基因,其含有来自日本粳稻染色体的3.3kb HindIII限制性片段。 对该基因的突变改变了细菌不同植物的结瘤能力。 在一个实例中,在该区域的Tn5插入导致菌株失去其结节siratro的能力,但大豆的结瘤不受影响。 该基因可以被操纵以扩展或限制用于农业目的的菌株的宿主范围。

    Recombinant DNA clones of essential nodulation genes of bradyrhizobium
japonicum
    2.
    发明授权
    Recombinant DNA clones of essential nodulation genes of bradyrhizobium japonicum 失效
    日本bradyrhizobium japonicum + B的重组DNA克隆重组DNA克隆

    公开(公告)号:US4983519A

    公开(公告)日:1991-01-08

    申请号:US77561

    申请日:1987-07-24

    IPC分类号: C07K14/195 C12N15/74

    摘要: Recombinant DNA clones according to the invention contain nodABCDIJL genes of B. japonicum. These clones can be used to practice a method wherein a nod- strain of Rhizobium or Bradyrhizobium bacteria lacking one or more of these genes is converted to a nod+ strain by transfering one or more of the missing genes to the strain. According to a further aspect of the invention, nucleotide sequences have been identified which control the expression of nod LABC genes of Bradyrhizobium japonicum in the presence of flavones produced by the plant roots. By linking such sequences with a gene having a desired characteristic, such as a gene encoding for production of a plant parasite toxin, bacterial can be created which selectively express the characteristic only in the presence of the flavone which triggers expression of the gene.

    摘要翻译: 根据本发明的重组DNA克隆含有日本粳稻的nodABCDIJL基因。 这些克隆可以用于实施一种方法,其中通过将一个或多个缺失基因转移到菌株,其中缺乏这些基因中的一个或多个的根瘤菌或Bradyrhizobium细菌的节点转化为点头+菌株。 根据本发明的另一方面,已经鉴定了在由植物根产生的黄酮存在下控制日本的Bradyrhizobium japonicum的点头LABC基因的表达的核苷酸序列。 通过将这些序列与具有所需特征的基因(例如编码植物寄生虫毒素的基因的基因)连接,可以产生仅在引发基因表达的黄酮存在下选择性地表达特征的细菌。