Location and Survival of Mycorrhiza Helper Pseudomonas fluorescens during Establishment of Ectomycorrhizal Symbiosis between Laccaria bicolor and Douglas Fir.

Applied and Environmental Microbiology
Pascale Frey-KlettJ Garbaye

Abstract

The mycorrhiza helper bacterium Pseudomonas fluorescens BBc6, isolated from a Laccaria bicolor sporocarp, consistently promotes L. bicolor-Douglas fir (Pseudotsuga menziesii) ectomycorrhizal formation, even with low doses of bacterial inoculum. In order to describe this phenomenon more accurately, we have looked at the location and survival of the introduced bacterial strain in the soil and in the rhizosphere during the establishment of mycorrhizal symbiosis in glasshouse and nursery experiments. Bacterial populations were quantified with a spontaneous, stable, rifampin-resistant mutant, BBc6R8, which phenotypically conformed to the parental strain. BBc6R8 populations declined rapidly, reaching the detection limit after 19 weeks, and did not increase either when L. bicolor sporocarps were forming in autumn or when Douglas fir roots resumed growing in spring. BBc6R8 was neither an endophyte nor a rhizobacterium. Furthermore, it was not particularly associated with either mycorrhizas of Douglas fir-L. bicolor or L. bicolor sporocarps. Surprisingly, a significant mycorrhiza helper effect was observed when the inoculated BBc6R8 population had dropped as low as 30 CFU g of dry matter(sup-1) in the soil. This study raises questions c...Continue Reading

References

Sep 1, 1974·The Journal of Applied Bacteriology·A Simon, E H Ridge

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Citations

Feb 1, 2003·Environmental Microbiology·Theo H M SmitsChristoph Keel
Sep 7, 2007·The New Phytologist·P Frey-KlettM Tarkka
Apr 4, 2008·Plant Biotechnology Journal·Jorge BarriusoF Javier Gutiérrez Mañero
Apr 23, 2009·The New Phytologist·Marlis ReichAndrea Polle
Apr 1, 2011·Environmental Microbiology Reports·Angela M CusanoPascale Frey-Klett
Aug 10, 2007·Environmental Microbiology·Elena BarbieriVilberto Stocchi
Apr 18, 2007·Biological Reviews of the Cambridge Philosophical Society·Susan J RobertsonP Michael Rutherford
Mar 1, 2015·Applied and Environmental Microbiology·Justine GaletBertrand Aigle
Nov 12, 2014·Frontiers in Plant Science·Jessy L LabbéGerald A Tuskan
Feb 22, 2005·The New Phytologist·Pascale Frey-KlettJean Garbaye
Dec 7, 2010·Applied Microbiology and Biotechnology·Jean-Michel Savoie, Michèle L Largeteau
Aug 21, 2013·BioMed Research International·Darine Trabelsi, Ridha Mhamdi
Oct 16, 2019·Frontiers in Microbiology·Esther SingerThomas E Juenger

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