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鉴定参与宿主特异性结瘤的慢生根瘤菌结瘤基因。

Identification of Bradyrhizobium nod genes involved in host-specific nodulation.

作者信息

Deshmane N, Stacey G

机构信息

Department of Microbiology, University of Tennessee, Knoxville 37996-0845.

出版信息

J Bacteriol. 1989 Jun;171(6):3324-30. doi: 10.1128/jb.171.6.3324-3330.1989.

DOI:10.1128/jb.171.6.3324-3330.1989
PMID:2542223
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC210053/
Abstract

Three loci important for soybean nodulation by Bradyrhizobium japonicum were delimited by Tn5 mutagenesis on a 5.3-kilobase EcoRI fragment adjacent to the nodABC genes. Results of hybridization studies suggested that this region is conserved in Bradyrhizobium species but absent in all Rhizobium species. lacZ translational fusions of two of the loci contained in this region were found to be inducible by host-produced flavonoid chemicals via a mechanism requiring a functional nodD gene product. A mutation in one of the loci was found to result in an alteration of the host range of B. japonicum. This mutation appears to block nodulation at the step at which plant root cortical cell division is induced.

摘要

通过Tn5诱变在与nodABC基因相邻的一个5.3千碱基的EcoRI片段上确定了对慢生根瘤菌大豆结瘤很重要的三个基因座。杂交研究结果表明，该区域在慢生根瘤菌属中是保守的，但在所有根瘤菌属物种中都不存在。发现该区域包含的两个基因座的lacZ翻译融合体可通过需要功能性nodD基因产物的机制被宿主产生的类黄酮化学物质诱导。发现其中一个基因座的突变会导致日本慢生根瘤菌宿主范围的改变。这种突变似乎在诱导植物根皮层细胞分裂的步骤中阻止结瘤。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c04/210053/bc78c136f481/jbacter00172-0429-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c04/210053/96b589da38cf/jbacter00172-0428-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c04/210053/2c504b1a788d/jbacter00172-0428-b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c04/210053/bc78c136f481/jbacter00172-0429-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c04/210053/96b589da38cf/jbacter00172-0428-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c04/210053/2c504b1a788d/jbacter00172-0428-b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c04/210053/bc78c136f481/jbacter00172-0429-a.jpg

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本文引用的文献

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Proc Natl Acad Sci U S A. 1987 Nov;84(21):7428-32. doi: 10.1073/pnas.84.21.7428.
2
Conservation of extended promoter regions of nodulation genes in Rhizobium.根瘤菌中结瘤基因扩展启动子区域的保守性。
Proc Natl Acad Sci U S A. 1986 Mar;83(6):1757-61. doi: 10.1073/pnas.83.6.1757.
3
Conservation of nodulation genes between Rhizobium meliloti and a slow-growing Rhizobium strain that nodulates a nonlegume host.
根瘤菌属（Bradyrhizobium japonicum）对羟基肉桂酸和异黄酮的趋化性和nod 基因活性。
Appl Environ Microbiol. 1991 Jan;57(1):316-9. doi: 10.1128/aem.57.1.316-319.1991.
4
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J Bacteriol. 1994 Feb;176(3):620-33. doi: 10.1128/jb.176.3.620-633.1994.
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Isoflavonoid-inducible resistance to the phytoalexin glyceollin in soybean rhizobia.异黄酮诱导大豆根瘤菌对植保素大豆抗毒素的抗性。
J Bacteriol. 1991 Jun;173(11):3432-9. doi: 10.1128/jb.173.11.3432-3439.1991.
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Proc Natl Acad Sci U S A. 1992 Sep 15;89(18):8789-93. doi: 10.1073/pnas.89.18.8789.
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Rhizobium meliloti nodulation genes allow Agrobacterium tumefaciens and Escherichia coli to form pseudonodules on alfalfa.苜蓿根瘤菌的结瘤基因使根癌土壤杆菌和大肠杆菌能在苜蓿上形成假根瘤。
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