Rhizobial diagnostic probes and rhizobium trifolii nifH promoters
    3.
    发明授权
    Rhizobial diagnostic probes and rhizobium trifolii nifH promoters 失效
    根瘤菌诊断探针和根瘤菌trifolii nifH启动子

    公开(公告)号:US5137816A

    公开(公告)日:1992-08-11

    申请号:US701358

    申请日:1991-05-10

    摘要: This invention provides useful promoters from the R. trifolii nifH gene for the construction of recombinant molecules to regulate foreign genes for expression under desired conditions. In particular, the promoters act to control expression of the foreign genes within root nodules formed by rhizobial bacterial strains in symbiotic combination with host plants.A rhizobium diagnostic segment (RDS) is also provided comprising a DNA segment found at more than one location in rhizobia, the RDS being species-specific, and detectable by DNA hybridization under stringent conditions. A recombinant plasmid comprising a RDS and a bacterial strain containing the plasmid are provided. Methods are provided for identifying species and strains of field isolates of Rhizobium, using RDS's. One RDS exemplified comprises 5' sequences from the R. trifolii nifH gene.

    摘要翻译: 本发明提供了来自三叶草nifH基因的有用的启动子,用于构建重组分子以调节外来基因以在期望的条件下表达。 特别地,启动子用于控制与宿主植物共生组合的由根瘤菌细菌菌株形成的根结节内的外源基因的表达。 还提供了根瘤菌诊断片段(RDS),其包含在根瘤菌中多于一个位置处发现的DNA片段,RDS是物种特异性的,并且可以在严格条件下通过DNA杂交检测。 提供了包含RDS和含有该质粒的细菌菌株的重组质粒。 提供了使用RDS来鉴定根瘤菌的分离株的种类和菌株的方法。 一个RDS示例包括来自三叶草nifH基因的5'序列。

    Nodulation gene promoter
    4.
    发明授权
    Nodulation gene promoter 失效
    结瘤基因启动子

    公开(公告)号:US5484718A

    公开(公告)日:1996-01-16

    申请号:US875300

    申请日:1986-06-17

    摘要: The invention includes a consensus nucleotide sequence found in the promoter regions of those Rhizobium and Bradyrhizobium nodulation genes which are activated by chemical inducer(s) in legume exudate. A promoter comprising the consensus sequence is a legume exudate-inducible promoter. A recombinant gene comprising a structural gene and a legume exudate-inducible promoter is selectively expressed in the presence of legume exudate or chemical inducer(s) and a functional nodD gene. The consensus nucleotide sequence isATCCAYNNYGYRGATGNWYKYKATCSAAWCAATCRATTTTACCARWYYKNSRR whereN is A, G, C or TY is C or TR is A or GW is A or TK is G or T andS is C or G.

    摘要翻译: 本发明包括在由豆科渗出物中的化学诱导剂活化的那些根瘤菌和Bradyrhizobium结瘤基因的启动子区域中发现的共有核苷酸序列。 包含共有序列的启动子是豆科渗出物诱导型启动子。 在豆类渗出物或化学诱导剂和功能性nodD基因的存在下,选择性地表达包含结构基因和豆科渗出物诱导型启动子的重组基因。 共有核苷酸序列为ATCCAYNNYGYRGATGNWYKYKATCSAAWCAATCRATTTTACCARWYYKNSRR,其中N为A,G,C或T Y为C或T R为A或G W为A或T K为G或T,S为C或G。

    Method for increasing yield and nodulation by bradyrhizobium
    5.
    发明授权
    Method for increasing yield and nodulation by bradyrhizobium 失效
    增加产量和结核杆菌的方法

    公开(公告)号:US5045461A

    公开(公告)日:1991-09-03

    申请号:US213906

    申请日:1988-06-30

    申请人: Kieran F. Scott

    发明人: Kieran F. Scott

    摘要: A method of increasing nodulation of a plant capable of being nodulated by Bradyrhizobium sp. (Parasponis) is provided comprising infecting said plant with a Bradyrhizobium sp. (Parasponia) species mutated such that nodK is non-functional. One such method of mutation involves insertion upstream of nodABC constitutive promoter sequences capable of activating nodABC. The invention is exemplified by the inoculation of siratro with mutated Bradyrhizobium sp. (Parasponia) mutated by insertion of nptII promoter sequences in nodK upstream of nodABC so as to activate nodABC. As compared with inoculation with the corresponding wild-type Bradyrhizobium sp. (Parasponia), nodulation onset occurred five days earlier, nodulation number was doubled, and a 120% enhancement of plant yield was shown. Similar results were obtained regardless of the orientation of the nptII promoter-containing sequences within the nodK coding sequence.

    摘要翻译: 一种能够增加由Bradyrhizobium sp。被结瘤的植物的结瘤的方法。 (Parasponis)包括用Bradyrhizobium sp。感染所述植物。 (Parasponia)物种突变,使得nodK不起作用。 一种这样的突变方法涉及在能够激活nodABC的nodABC组成型启动子序列的上游插入。 通过用突变的Bradyrhizobium sp接种siratro来举例说明本发明。 (Parasponia)通过在nodAB上游的nodK中插入nptII启动子序列突变,以激活nodABC。 与接种相应的野生型Bradyrhizobium sp相比, (Parasponia),结核发病发生在五天前,结瘤数增加一倍,植株产量提高了120%。 无论nodK编码序列中含有nptII启动子的序列的取向如何,均获得相似的结果。