Interactions between Pseudomonas fluorescens biocontrol agents and Glomus mosseae, an arbuscular mycorrhizal fungus, within the rhizosphere

摘要

Interactions between Pseudomonas fluorescens biocontrol agents and Glomus mosseae: an arbuscular mycorrhizal fungus, were studied. The biocontrol agents included the genetically modified strains CHA96 and CHA0 pME3424 which produced enhanced levels of antifungal compounds. Tomato (Lycopersicum esculentum) and leek (Allium porrum) host plants were grown in sterile Terra-Green (calcined attapulgite clay) with limited nutrients. Mycorrhizal activity was indicated by shoot dry weight and phosphorus content. In all experiments, plants grown in the presence of G. mosseae had a significantly higher shoot dry weight than those grown in the absence of G. mosseae. Colonisation and activity of G. mosseae was unaltered in the presence of P. fluorescens isolates and presence of G. mosseae increased the population of P. fluorescens in the rhizosphere. (C) 1998 Published by Elsevier Science B.V. All rights reserved. [References: 34]