Specific interactions between arbuscular mycorrhizal fungi and plant growth-promoting bacteria: as revealed by different combinations

Abstract

The interactions between two plant growth-promoting rhizobacteria (PGPR, Pseudomonas fluorescens SBW25 and Paenibacillus brasilensis PB177), two arbuscular mycorrhizal (AM) fungi (Glomus mosseae and Glomus intraradices) and one pathogenic fungus (Microdochium nivale) were investigated on winter wheat (Triticum aestivum cultivar Tarso) in a greenhouse trial. PB177, but not SBW25, had strong inhibitory effects on M. nivale in dual culture plate assays. The results from the greenhouse experiment show very specific interactions; for example, the two AM fungi react differently when interacting with the same bacteria on plants. Glomus intraradices (single inoculation or together with SBW25) increased plant dry weight on M. nivale-infested plants, suggesting that the pathogenic fungus is counteracted by G. intraradices, but PB177 inhibited this positive effect. This is an example of two completely different reactions between the same AM fungus and two species of bacteria, previously known to enhance plant growth and inhibit pathogens. When searching for plant growth-promoting microorganisms, it is therefore important to test for the most suitable combination of plant, bacteria and fungi in order to achieve satisfactory plant growth benefits.

Keywords

arbuscular mycorrhizal fungi; Pseudomonas fluorescens SBW25; Paenibacillus brasilensis PB177; microbial interactions; plant growth-promoting bacteria; Microdochium nivale

Published in

FEMS Microbiology Letters
2008, Volume: 287, number: 2, pages: 174-180
Publisher: BLACKWELL PUBLISHING

SLU Authors

• Jäderlund, Lotta

  • Department of Molecular Sciences, Swedish University of Agricultural Sciences
    

• Arthurson, Veronica

  • Department of Molecular Sciences, Swedish University of Agricultural Sciences
    

• Granhall, Ulf

  • Department of Molecular Sciences, Swedish University of Agricultural Sciences
    

• Jansson, Janet

  • Department of Molecular Sciences, Swedish University of Agricultural Sciences
    
  • Lawrence Berkeley National Laboratory (Berkeley Lab)

UKÄ Subject classification

Horticulture
Agricultural Science


Publication identifier

DOI: https://doi.org/10.1111/j.1574-6968.2008.01318.x

Permanent link to this page (URI)

https://res.slu.se/id/publ/18987