Open AccessSpecific interactions between arbuscular mycorrhizal fungi and plant growth‐promoting bacteria: as revealed by different combinations
Author(s) -
Jäderlund Lotta,
Arthurson Veronica,
Granhall Ulf,
Jansson Janet K.
Publication year - 2008
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2008.01318.x
Subject(s) - biology , glomus , fungus , pseudomonas fluorescens , inoculation , glomeromycota , bacteria , botany , pathogenic fungus , rhizobacteria , mycorrhiza , symbiosis , horticulture , rhizosphere , genetics
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.