Rhizophagus irregularis MUCL 41833 transitorily reduces tomato bacterial wilt incidence caused by Ralstonia solanacearum under in vitro conditions

Abstract

Bacterial wilt caused by Ralstonia solanacearum is one of the world's most important soil-borne plant diseases. In Martinique, French West Indies, a highly virulent new pathogenic variant of this bacterium (phylotype IIB/4NPB) severely impacts tomato production. Here we report on the effect of R. solanacearum CFBP 6783, classified in phytotype IIB/4NPB, on tomato plantlets grown under strict in vitro culture conditions in the presence or absence of the arbuscular mycorrhizal fungus Rhizophagus irregularis MUCL 41833. A mycelium donor plant (i.e. Crotalaria spectabilis) was used for rapid, uniform mycorrhization of tomato plantlets that were subsequently infected by the bacterium. Bacterial wilt was significantly delayed and the incidence of the disease consequently reduced in the mycorrhizal tomato plantlets. Conversely, R. solanacearum did not affect root colonization by the AMF within the 16 days of the experiment. These results suggested that the mycorrhizal fungus was able to reduce bacterial wilt symptoms, probably by eliciting defence mechanisms in the plant.

Mycorrhiza induced tolerance in Cucumis sativus against root rot caused by Pythium ultimum depends on fungal species in the arbuscular mycorrhizal symbiosis

“…Root rot is caused by a complex of several soil-borne plant pathogens, andpathogens and is are a major problem in plant production leading to serious economic loss for farmers . The arbuscular mycorrhizal (AM) symbiosis is known to improve root health with biocontrol features against a broad range of abiotic (Birhane et al 2018) and biotic agentssoil borne pathogens , including fungi , bacteria (Chave et al 2017) and oomycetes . Confirmedly, research has shown that AM can increase Cucumis sativus root health when infected by Fusarium oxysporum , Rhizoctonia solani (Chandanie et al 2009) and Pythium ultimum .…”

Identification of Cyclic Dipeptides from Escherichia coli as New Antimicrobial Agents against Ralstonia Solanacearum

“…It is a way to adapt to the trend of “green agriculture”. Many biocontrol agents have been isolated and tested for their activity against bacterial wilt, including Rhizophagus irregularis [ 18 ], Pseudomonas fluorescens [ 19 ], Bacillus amyloliquefaciens [ 20 ], and Stenotrophomonas maltophilia [ 21 ]. In this study, we isolated and identified three new bacterial species with high activity against R. solanacearum .…”