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Proc Biol Sci

Title:		Combined effects of mutualistic rhizobacteria counteract virus-induced suppression of indirect plant defences in soya bean
Author(s):		Pulido H; Mauck KE; De Moraes CM; Mescher MC;
Address:		"1 Department of Environmental Systems Science, Swiss Federal Institute of Technology (ETH Zurich) , 8092 Zurich , Switzerland. 2 Department of Entomology, University of California , Riverside, CA , USA"
Journal Title:		Proc Biol Sci
Year:		2019
Volume:		286
Issue:		1903
Page Number:		20190211 -
DOI:		10.1098/rspb.2019.0211
ISSN/ISBN:		1471-2954 (Electronic) 0962-8452 (Print) 0962-8452 (Linking)
Abstract:		"It is increasingly clear that microbial plant symbionts can influence interactions between their plant hosts and other organisms. However, such effects remain poorly understood, particularly under ecologically realistic conditions where plants simultaneously interact with diverse mutualists and antagonists. Here, we examine how the effects of a plant virus on indirect plant defences against its insect vector are influenced by co-occurrence of other microbial plant symbionts. Using a multi-factorial design, we manipulated colonization of soya bean using three different microbes: a pathogenic plant virus (bean pod mottle virus (BPMV)), a nodule-forming beneficial rhizobacterium ( Bradyrhizobium japonicum) and a plant growth-promoting rhizobacterium ( Delftia acidovorans). We then assessed recruitment of parasitoids ( Pediobious foveolatus (Eulophidae)) and parasitism rates following feeding by the BPMV vector Epilachna varivestis (Coccinellidae). BPMV infection suppressed parasitoid recruitment, prolonged parasitoid foraging time and reduced parasitism rates in semi-natural foraging assays. However, simultaneous colonization of BPMV-infected hosts by both rhizobacteria restored parasitoid recruitment and rates of parasitism to levels similar to uninfected controls. Co-colonization by the two rhizobacteria also enhanced parasitoid recruitment in the absence of BPMV infection. These results illustrate the potential of plant-associated microbes to influence indirect plant defences, with implications for disease transmission and herbivory, but also highlight the potential complexity of such interactions"
Keywords:		Bradyrhizobium/*physiology Comovirus/*physiology Delftia acidovorans/*physiology *Plant Immunity Soybeans/immunology/microbiology/*physiology *Symbiosis Epilachna varivestis Pediobious foveolatus bean pod mottle virus beneficial rhizobacteria pathogen pla;
Notes:		"MedlinePulido, Hannier Mauck, Kerry E De Moraes, Consuelo M Mescher, Mark C eng Research Support, Non-U.S. Gov't England 2019/05/23 Proc Biol Sci. 2019 May 29; 286(1903):20190211. doi: 10.1098/rspb.2019.0211"