Hye Suk Kong

Center for Biologics Evaluation and Research

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John E. Lydon

Beltsville Agricultural Research Center

Daniel P. Roberts

Beltsville Agricultural Research Center

C.D. Patterson

Agricultural Research Service

Dilip K. Lakshman

Beltsville Agricultural Research Center

Laurie F. McKenna

Beltsville Agricultural Research Center

Stephan Heeb

University of Nottingham

Xiaojia Hu

Chinese Academy of Agricultural Sciences

C. Jacyn Baker

Florida Department of Agriculture and Consumer Services

Jorge Teodoro de Souza

Universidade Federal de Lavras

Scott M. Lohrke

Agricultural Research Service

Cooperative Institutions

Beltsville Agricultural Research Center

Agricultural Research Service

United States Department of Agriculture

Center for Biologics Evaluation and Research

University of Nottingham

U.S. Vegetable Laboratory

Sustainable Energy Systems (United Kingdom)

Animal and Plant Health Inspection Service

Engineering and Physical Sciences Research Council

Biotechnology and Biological Sciences Research Council

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Mutation in cyaA in Enterobacter cloacae decreases cucumber root colonization

Archives of Microbiology (2006)

Daniel P. Roberts Laurie F. McKenna Xiaojia Hu Scott M. Lohrke Hye Suk Kong

Enterobacter cloacae

Exudate

Strain (injury)

10.1007/s00203-006-0177-6

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Citations (9)

Effect of OverexpressingrsmAfromPseudomonas aeruginosaon Virulence of Select Phytotoxin-Producing Strains ofP. syringae

Phytopathology (2012)

Hye Suk Kong Daniel P. Roberts C.D. Patterson Sarah A. Kuehne Stephan Heeb

The GacS/GacA two-component system functions mechanistically in conjunction with global post-transcriptional regulators of the RsmA family to allow pseudomonads and other bacteria to adapt to changing environmental stimuli. Analysis of this Gac/Rsm signal transduction pathway in phytotoxin-producing pathovars of Pseudmonas syringae is incomplete, particularly with regard to rsmA. Our approach in studying it was to overexpress rsmA in P. syringae strains through introduction of pSK61, a plasmid constitutively expressing this gene. Disease and colonization of plant leaf tissue were consistently diminished in all P. syringae strains tested (pv. phaseolicola NPS3121, pv. syringae B728a, and BR2R) when harboring pSK61 relative to these isolates harboring the empty vector pME6031. Phaseolotoxin, syringomycin, and tabtoxin were not produced in any of these strains when transformed with pSK61. Production of protease and pyoverdin as well as swarming were also diminished in all of these strains when harboring pSK61. In contrast, alginate production, biofilm formation, and the hypersensitive response were diminished in some but not all of these isolates under the same growth conditions. These results indicate that rsmA is consistently important in the overarching phenotypes disease and endophtyic colonization but that its role varies with pathovar in certain underpinning phenotypes in the phytotoxin-producing strains of P. syringae.

Pseudomonas syringae

Phytotoxin

Coronatine

Pathovar

Swarming motility

Pseudomonadales

10.1094/phyto-09-11-0267

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Citations (32)