Specific and conserved patterns of microbiota-structuring by maize benzoxazinoids in the field

Cadot, Selma; Guan, Hang; Bigalke, Moritz; Walser, Jean-Claude; Jander, Georg; Erb, Matthias; van der Heijden, Marcel G. A.; Schlaeppi, Klaus (2021). Specific and conserved patterns of microbiota-structuring by maize benzoxazinoids in the field. Microbiome, 9(1), p. 103. BioMed Central 10.1186/s40168-021-01049-2

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Background: Plants influence their root and rhizosphere microbial communities through the secretion of root exudates. However, how specific classes of root exudate compounds impact the assembly of root-associated microbiotas is not well understood, especially not under realistic field conditions. Maize roots secrete benzoxazinoids (BXs), a class of indole-derived defense compounds, and thereby impact the assembly of their microbiota. Here, we investigated the broader impacts of BX exudation on root and rhizosphere microbiotas of adult maize plants grown under natural conditions at different field locations in Europe and the USA. We examined the microbiotas of BX- producing and multiple BX-defective lines in two genetic backgrounds across three soils with different properties.
Results: Our analysis showed that BX secretion affected the community composition of the rhizosphere and root microbiota, with the most pronounced effects observed for root fungi. The impact of BX exudation was at least as strong as the genetic background, suggesting that BX exudation is a key trait by which maize structures its associated microbiota. BX-producing plants were not consistently enriching microbial lineages across the three field experiments. However, BX exudation consistently depleted Flavobacteriaceae and Comamonadaceae and enriched various potential plant pathogenic fungi in the roots across the different environments.
Conclusions: These findings reveal that BXs have a selective impact on root and rhizosphere microbiota composition across different conditions. Taken together, this study identifies the BX pathway as an interesting breeding target to manipulate plant-microbiome interactions.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Soil Science
08 Faculty of Science > Institute of Geography
08 Faculty of Science > Institute of Geography > Physical Geography
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Biotic Interactions
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Guan, Hang; Bigalke, Moritz; Erb, Matthias and Schläppi, Klaus Bernhard

Subjects:

500 Science > 580 Plants (Botany)
500 Science > 550 Earth sciences & geology
900 History > 910 Geography & travel

ISSN:

2049-2618

Publisher:

BioMed Central

Language:

English

Submitter:

Andrea Katja Weber

Date Deposited:

11 Jun 2021 10:23

Last Modified:

10 Aug 2021 10:11

Publisher DOI:

10.1186/s40168-021-01049-2

PubMed ID:

33962687

BORIS DOI:

10.48350/156570

URI:

https://boris.unibe.ch/id/eprint/156570

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