Mutation in cyaA in Enterobacter cloacae decreases cucumber root colonization

文献类型： 外文期刊

第一作者： Roberts, Daniel P.

作者： Roberts, Daniel P.;McKenna, Laurie F.;Hu, Xiaojia;Lohrke, Scott M.;Kong, Hye Suk;de Souza, Jorge T.;Baker, C. Jacyn;Lydon, John

作者机构：

关键词： biological control;colonization;cyclic AMP;cyaA;rhizosphere;ESCHERICHIA-COLI K-12;HEAT-SHOCK RESPONSE;PSEUDOMONAS-FLUORESCENS;ADENYLATE-CYCLASE;CYCLIC-AMP;RHIZOSPHERE COLONIZATION;SALMONELLA-TYPHIMURIUM;SIGNAL-TRANSDUCTION;2-COMPONENT SYSTEM;RECEPTOR PROTEIN

期刊名称：ARCHIVES OF MICROBIOLOGY （ 影响因子：2.552； 五年影响因子：2.475 ）

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收录情况： SCI

摘要： Strains of Enterobacter cloacae show promise as biological control agents for Pythium ultimum-induced damping-off on cucumber and other crops. Enterobacter cloacae M59 is a mini-Tn5 Km transposon mutant of strain 501R3. Populations of M59 were significantly lower on cucumber roots and decreased much more rapidly than those of strain 501R3 with increasing distance from the soil line. Strain M59 was decreased or deficient in growth and chemotaxis on most individual compounds detected in cucumber root exudate and on a synthetic cucumber root exudate medium. Strain M59 was also slightly less acid resistant than strain 501R3. Molecular characterization of strain M59 demonstrated that mini-Tn5 Km was inserted in cyaA, which encodes adenylate cyclase. Adenylate cyclase catalyzes the formation of cAMP and cAMP levels in cell lysates from strain M59 were approximately 2% those of strain 501R3. Addition of exogenous, nonphysiological concentrations of cAMP to strain M59 restored growth (1 mM) and chemotaxis (5 mM) on synthetic cucumber root exudate and increased cucumber seedling colonization (5 mM) by this strain without serving as a source of reduced carbon, nitrogen, or phosphorous. These results demonstrate a role for cyaA in colonization of cucumber roots by Enterobacter cloacae.

分类号： R37

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