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Applied and Environmental Microbiology, April 2002, p. 2085-2088, Vol. 68, No. 4
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.4.2085-2088.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Inactivation of the Regulatory Gene algU or gacA Can Affect the Ability of Biocontrol Pseudomonas fluorescens CHA0 To Persist as Culturable Cells in Nonsterile Soil

Fabio Mascher,1,{dagger} Yvan Moënne-Loccoz,2 Ursula Schnider-Keel,3 Christoph Keel,3 Dieter Haas,3 and Geneviève Défago1*

Phytopathology Group, Institute of Plant Science, Swiss Federal Institute of Technology (ETH), CH-8092 Zürich,1 Laboratoire de Biologie Microbienne, Université de Lausanne, CH-1015 Lausanne, Switzerland,3 UMR CNRS Ecologie Microbienne, Université Claude Bernard (Lyon 1), F-69622 Villeurbanne, France2

Received 10 October 2001/ Accepted 10 January 2002

Rifampin-resistant Pseudomonas fluorescens CHA0-Rif and mutants in which the regulatory gene algU (encoding sigma factor {sigma}E) or gacA (encoding a global regulator of secondary metabolism) was inactivated were compared for persistence in three nonsterile soils. Functional algU and (particularly) gacA were needed for CHA0-Rif to maintain cell culturability in soil.

* Corresponding author. Mailing address: Phytopathology Group, Institute of Plant Science, Swiss Federal Institute of Technology (ETH), Universitätstr. 2, LFW, CH-8092 Zürich, Switzerland. Phone: 41-1-632-38-69. Fax: 41-1-632-11-08. E-mail: genevieve.defago{at}ipw.agrl.ethz.ch.

{dagger} Present address: Swiss Federal Research Station for Plant Production of Changins (RAC), CH-1260 Nyon, Switzerland.

Applied and Environmental Microbiology, April 2002, p. 2085-2088, Vol. 68, No. 4
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.4.2085-2088.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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