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    • 6. 发明授权
    • Rhizobium japonicum 191 NODD-related genes
    • 日本根瘤菌191型NODD相关基因
    • US5059534A
    • 1991-10-22
    • US403907
    • 1989-07-17
    • Edward R. Appelbaum
    • Edward R. Appelbaum
    • C07K14/195C12N15/74
    • C07K14/195C12N15/743Y10S435/878
    • The isolation and characterization of nodD-related genes in soybean nodulating Rhizobium japonicum is described. In R. japonicum USDA 191 two such genes have been identified, which although related in structure, have different functional properties. These nodD genes are functionally distinct from each other and from those nodD genes of other strains of Rhizobium that have been isolated and characterized to date. In particular, nodD-r1 has been found to affect nodulation on soybean and to be associated with exopolysaccharide production. In contrast, nodD-r2 affects nodulation on the tropical legume siratro. The coding sequences of both nodD genes are provided. The promoter regions of the nodD genes have also been isolated. The genes described herein, including both structural genes and their promoter regions, can be used in combination with other genetic constructs to enhance the efficiency and competitiveness of nodulation.
    • 描述了大豆结核根瘤菌中nodD相关基因的分离和表征。 在日本R.Rapapumum USDA 191中,已经鉴定了两种这样的基因,尽管它们的结构相关,但具有不同的功能特性。 这些nodD基因在功能上是彼此不同的,以及目前已被分离和表征的其他根瘤菌菌株的那些nodD基因。 特别地,已经发现nodD-r1影响大豆的结瘤并与外多糖生产有关。 相比之下,nodD-r2影响热带豆科西罗的结节。 提供了两种nodD基因的编码序列。 nodD基因的启动子区域也已被分离。 本文描述的基因,包括结构基因及其启动子区域,都可以与其他基因构建体结合使用,以提高结瘤的效率和竞争力。
    • 8. 发明授权
    • Method for selecting mutants of legume-nodulating bacteria enhanced in
competition
    • 在竞争中增强豆科结瘤细菌突变体的选择方法
    • US5432079A
    • 1995-07-11
    • US166681
    • 1988-03-11
    • Eric JohansenEdward R. Appelbaum
    • Eric JohansenEdward R. Appelbaum
    • C12N15/74C12Q1/04C12Q1/68C12N1/20C12N1/21C12N15/01
    • C12Q1/6897C12N15/743C12Q1/04Y10S435/878
    • Methods for the isolation of mutant rhizobial strains with improved competition of nodulation (Comp.sup.+) is presented. Mutants are selected for constitutive expression of inducible nod genes (in the absence of inducer) and screened for hyperinduction of nod genes in the presence of inducer. Mutants which are defective in nodulation or in symbiotic nitrogen fixation are eliminated from further testing. Selections for constitutive nod expression and for hyperinduction of nod genes are facilitated by the use of plasmid carrying a selectable marker fused to an inducible nod gene and a plasmid carrying a reporter gene fused downstream of an inducible nod gene. The methods exemplified are particularly useful for the isolation and identification of Comp.sup.+ mutants of Bradyrhizobium japonicum.
    • 提出了具有改善的结瘤竞争(Comp +)的突变根瘤菌菌株分离方法。 选择突变体用于诱导型节点基因的组成型表达(在不存在诱导物的情况下),并筛选出在诱导物存在下点头基因的高度诱导。 在结瘤或共生固氮中有缺陷的突变体从进一步测试中消除。 通过使用携带可诱导的点头基因融合的选择标记的质粒和携带可诱导的点头基因下游融合的报道基因的质粒,促进了组成型nod表达和nod基因超调诱导的选择。 所列举的方法对于分离和鉴定日本Bradyrhizobium日本的Comp +突变体是特别有用的。
    • 9. 发明授权
    • Bradyrhizobium japonicum nodulation inducing factor
    • 白僵菌结核诱导因子
    • US5229113A
    • 1993-07-20
    • US393081
    • 1989-08-09
    • Renee KosslakRoger BooklandEdward R. Appelbaum
    • Renee KosslakRoger BooklandEdward R. Appelbaum
    • A01C1/00A01N63/00C05F11/08C07K14/195C12N15/74
    • C12N15/74A01C1/00A01N63/00C05F11/08C07K14/195Y10S435/878Y10S47/09Y10S47/10
    • The chemical compounds that induce expression of nodulation genes of Bradyrhizobium japonicum strains have been identified. The isoflavones daidzein and genistein were identified as soybean exudate components that induce nod-genes. Other isoflavones, including 7-hydroxyisoflavone, 5,7-dihydroxyisoflavone, biochanin A, formononetin and prunetin, were also found to act as inducers. In addition, several flavonoid compounds including 4',7-dihydroxyflavone, apigenin, kaempferol and coumestrol, were also found to act as inducers. Nodulation inducing compositions and a method for selectively activating the expression of a gene under the control of a soybean exudate inducible promoter in B. japonicum in response to these inducer molecules are described. In addition, soybean inoculating compositions containing the nod-gene inducers and inoculating methods employing these compositions are described.
    • 已经鉴定了引起日本。Brad of of of of结节基因表达的化合物。 异黄酮黄豆苷原和染料木素被鉴定为诱导结节基因的大豆渗出物成分。 还发现其他异黄酮,包括7-羟基异黄酮,5,7-二羟基异黄酮,鹰嘴豆素A,角叉菜素和杏仁素,作为诱导剂。 此外,还发现了包括4',7-二羟基黄酮,芹菜素,山奈酚和香豆素的几种类黄酮化合物作为诱导剂。 描述了结瘤诱导组合物和用于选择性地激活在这些诱导剂分子响应于日本粳稻的大豆渗出物诱导型启动子控制下的基因表达的方法。 此外,还描述了含有点状基因诱导剂的大豆接种组合物和使用这些组合物的接种方法。