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Applied and Environmental Microbiology, December 2002, p. 6383-6387, Vol. 68, No. 12
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.12.6383-6387.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Field Studies Using a Recombinant Mycoinsecticide (Metarhizium anisopliae) Reveal that It Is Rhizosphere Competent

Gang Hu and Raymond J. St. Leger*

Department of Entomology, University of Maryland, College Park, Maryland 20742

Received 1 April 2002/ Accepted 29 August 2002

In the summer of 2000, we released genetically altered insect-pathogenic fungi onto a plot of cabbages at a field site on the Upper Marlboro Research Station, Md. The transformed derivatives of Metarhizium anisopliae ARSEF 1080, designated GPMa and GMa, carried the Aequorea victoria green fluorescent protein (gfp) gene alone (GMa) or with additional protease genes (Pr1) (GPMa). The study (i) confirmed the utility of gfp for monitoring pathogen strains in field populations over time, (ii) demonstrated little dissemination of transgenic strains and produced no evidence of transmission by nontarget insects, (iii) found that recombinant fungi were genetically stable over 1 year under field conditions, and (iv) determined that deployment of the transgenic strains did not depress the culturable indigenous fungal microflora. The major point of the study was to monitor the fate (survivorship) of transformants under field conditions. In nonrhizosphere soil, the amount of GMa decreased from 105 propagules/g at depths of 0 to 2 cm to 103 propagules/g after several months. However, the densities of GMa remained at 105 propagules/g in the inner rhizosphere, demonstrating that rhizospheric soils are a potential reservoir for M. anisopliae. These results place a sharp focus on the biology of the soil/root interphase as a site where plants, insects, and pathogens interact to determine fungal biocontrol efficacy, cycling, and survival. However, the rhizospheric effect was less marked for GPMa, and overall it showed reduced persistence in soils than did GMa.

* Corresponding author. Mailing address: 4112 Plant Science Building, University of Maryland, College Park, MD 20742-4454. Phone: (301) 405-5402. Fax: (301) 314-9290. E-mail: rl106{at}umail.umd.edu.

Applied and Environmental Microbiology, December 2002, p. 6383-6387, Vol. 68, No. 12
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.12.6383-6387.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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