Evidence for the plant recruitment of beneficial microbes to suppress soil‐borne pathogens

Article


Liu, Hongwei, Li, Jiayu, Carvalhais, Lilia C., Percy, Cassandra D., Verma, Jay Prakash, Schenk, Peer M. and Singh, Brajesh K.. 2021. "Evidence for the plant recruitment of beneficial microbes to suppress soil‐borne pathogens." New Phytologist. 229 (5), pp. 2873-2885. https://doi.org/10.1111/nph.17057
Article Title

Evidence for the plant recruitment of beneficial microbes to suppress soil‐borne pathogens

ERA Journal ID2625
Article CategoryArticle
AuthorsLiu, Hongwei (Author), Li, Jiayu (Author), Carvalhais, Lilia C. (Author), Percy, Cassandra D. (Author), Verma, Jay Prakash (Author), Schenk, Peer M. (Author) and Singh, Brajesh K. (Author)
Journal TitleNew Phytologist
Journal Citation229 (5), pp. 2873-2885
Number of Pages13
Year2021
PublisherJohn Wiley & Sons
Place of PublicationUnited Kingdom
ISSN0028-646X
1469-8137
Digital Object Identifier (DOI)https://doi.org/10.1111/nph.17057
Web Address (URL)https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.17057
Abstract

An emerging experimental framework suggests that plants under biotic stress may actively seek help from soil microbes, but empirical evidence underlying such a ‘cry for help’ strategy is limited. We used integrated microbial community profiling, pathogen and plant transcriptive gene quantification and culture-based methods to systematically investigate a three-way interaction between the wheat plant, wheat-associated microbiomes and Fusarium pseudograminearum (Fp). A clear enrichment of a dominant bacterium, Stenotrophomonas rhizophila (SR80), was observed in both the rhizosphere and root endosphere of Fp-infected wheat. SR80 reached 3.7 × 107 cells g−1 in the rhizosphere and accounted for up to 11.4% of the microbes in the root endosphere. Its abundance had a positive linear correlation with the pathogen load at base stems and expression of multiple defence genes in top leaves. Upon re-introduction in soils, SR80 enhanced plant growth, both the below-ground and above-ground, and induced strong disease resistance by boosting plant defence in the above-ground plant parts, but only when the pathogen was present. Together, the bacterium SR80 seems to have acted as an early warning system for plant defence. This work provides novel evidence for the potential protection of plants against pathogens by an enriched beneficial microbe via modulation of the plant immune system.

Keywordscrown rot, endophytes, Fusarium pseudograminearum, plant microbiome, Stenotrophomonas rhizophila, wheat
ANZSRC Field of Research 2020310805. Plant pathology
300409. Crop and pasture protection (incl. pests, diseases and weeds)
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Byline AffiliationsUniversity of Queensland
Western Sydney University
Centre for Crop Health
Banaras Hindu University, India
Institution of OriginUniversity of Southern Queensland
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