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Appl Environ Microbiol, June 1998, p. 2304-2307, Vol. 64, No. 6
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Impact on Arbuscular Mycorrhiza Formation of Pseudomonas Strains Used as Inoculants for Biocontrol of Soil-Borne Fungal Plant Pathogens

J. M. Barea,1,* G. Andrade,1 V. Bianciotto,2 D. Dowling,3 S. Lohrke,3 P. Bonfante,2 F. O'Gara,3 and C. Azcon-Aguilar1

Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain1; Dipartimento di Biologia Vegetale, Università di Torino, Turin, 10125, Italy2; and Microbiology Department, University College, Cork, Ireland3

Received 19 September 1996/Accepted 25 February 1998

The arbuscular mycorrhizal symbiosis, a key component of agroecosystems, was assayed as a rhizosphere biosensor for evaluation of the impact of certain antifungal Pseudomonas inoculants used to control soil-borne plant pathogens. The following three Pseudomonas strains were tested: wild-type strain F113, which produces the antifungal compound 2,4-diacetylphloroglucinol (DAPG); strain F113G22, a DAPG-negative mutant of F113; and strain F113(pCU203), a DAPG overproducer. Wild-type strain F113 and mutant strain F113G22 stimulated both mycelial development from Glomus mosseae spores germinating in soil and tomato root colonization. Strain F113(pCU203) did not adversely affect G. mosseae performance. Mycelial development, but not spore germination, is sensitive to 10 µM DAPG, a concentration that might be present in the rhizosphere. The results of scanning electron and confocal microscopy demonstrated that strain F113 and its derivatives adhered to G. mosseae spores independent of the ability to produce DAPG.

* Corresponding author. Mailing address: Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, c/Prof. Albareda 1, Granada 18008, Spain. Phone: 34 9 58 121011. Fax: 34 9 58 129600. E-mail: jmbarea{at}eez.csic.es.

Appl Environ Microbiol, June 1998, p. 2304-2307, Vol. 64, No. 6
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

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