IDENTIFICATION AND CLONING OF BRADYRHIZOBIUM-JAPONICUM GENES EXPRESSED STRAIN SELECTIVELY IN SOIL AND RHIZOSPHERE

被引：27

作者：

BHAGWAT, AA ^{[1
]}

KEISTER, DL ^{[1
]}

机构：

[1] USDA ARS, BELTSVILLE AGR RES CTR,SOYBEAN & ALFALFA RES LAB, BLDG 011,HH-19, BARC W, BELTSVILLE, MD 20705 USA

来源：

APPLIED AND ENVIRONMENTAL MICROBIOLOGY | 1992年 / 58卷 / 05期

关键词：

D O I：

10.1128/AEM.58.5.1490-1495.1992

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

The growth of Bradyrhizobium japonicum USDA 110 and USDA 438 in soil extract-supplemented medium led to transcription of a large amount of DNA not expressed in basal medium. Strain USDA 438 was more competitive for the nodulation of soybean than strain USDA 110. To identify and isolate DNA regions which were expressed specifically in strain USDA 438 but not in strain USDA 110 in response to soil extract or soybean root exudate, we developed a subtractive RNA hybridization procedure. Several cosmid clones which showed strain-specific gene expression were isolated from a USDA 438 gene library. Two clones enhanced competitive nodulation when mobilized to USDA 110. The method described may be useful for identifying genes expressed in response to environmental stimuli or genes expressed differently in related microbial strains.

引用

页码：1490 / 1495

页数：6

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