Journal
MOLECULAR PLANT-MICROBE INTERACTIONS
Volume 14, Issue 2, Pages 255-260Publisher
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/MPMI.2001.14.2.255
Keywords
alginate; PGPRs; pseudomonads; surface polysaccharides
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Extracellular polysaccharides play an important role in the formation of bacterial biofilms. We tested the biofilm-forming ability of two mutant strains with increased production of acidic extracellular polysaccharides compared with the wild-type biocontrol strain Pseudomonas fluorescens CHA0. The anchoring of bacteria to axenic nonmycorrhizal and mycorrhizal roots as well as on extraradical mycelium of the arbuscular mycorrhizal fungus Glomus intraradices was investigated. The nonmucoid wild-type strain P. fluorescens CHA0 adhered very little on all surfaces, whereas both mucoid strains formed a dense and patchy bacterial layer on the roots and fungal structures. Increased adhesive properties of plant-growth-promoting bacteria may lead to more stable interactions in mixed inocula and the rhizosphere.
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