Wheat rhizosphere-derived bacteria protect soybean roots from Fusarium graminearum infection

Authors: Yin, Chuntao; LARSON, MATT - South Dakota State University; Lahr, Nathan; Paulitz, Timothy

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 3/17/2023
Publication Date: 12/29/2023
Citation: Yin, C., Larson, M., Lahr, N.D., Paulitz, T.C. 2023. Wheat rhizosphere-derived bacteria protect soybean roots from Fusarium graminearum infection [abstract]. Phytopathology Plant Health 2023. p. 196. https://doi.org/10.1094/PHYTO-113-11-S3.1.
DOI: https://doi.org/10.1094/PHYTO-113-11-S3.1

Interpretive Summary:

Technical Abstract: Root rot of soybean [Glycine max (L.) Merr.], caused by Fusarium spp., is a major constraint to pulse production in the Great Plains. Fusarium graminearum is the predominant Fusarium species in South Dakota's soybean fields, according to a previous survey. Current disease management options, including tolerant varieties, fungicides, and tillage, have limited efficacy for the pathogenic Fusarium species. In this study, 61 bacterial strains were isolated from wheat rhizospheres infected with the soilborne pathogen, Rhizoctonia solani AG8. Six of them significantly inhibited the growth of Fusarium graminearum in vitro using the dual culture assay. 16S rRNA gene sequencing and phylogenetic analyses were used to identify these bacterial strains as Chryseobacterium ginsengisoli, Chryseobacterium indologenes, Pseudomonas poae, two Pseudomonas spp., and Delftia acidovorans, respectively. Further greenhouse tests found that two Chryseobacterium spp. and one Pseudomonas sp. protected soybean roots from F. graminearum infection. However, the six bacterial strains did not promote the growth of soybean and wheat. The mechanism of action in the inhibition of soybean root rot will be further studied.