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Metabolic regulation of the maize rhizobiome by benzoxazinoids.
- Source :
-
The ISME journal [ISME J] 2019 Jul; Vol. 13 (7), pp. 1647-1658. Date of Electronic Publication: 2019 Feb 22. - Publication Year :
- 2019
-
Abstract
- The rhizobiome is an important regulator of plant growth and health. Plants shape their rhizobiome communities through production and release of primary and secondary root metabolites. Benzoxazinoids (BXs) are common tryptophan-derived secondary metabolites in grasses that regulate belowground and aboveground biotic interactions. In addition to their biocidal activity, BXs can regulate plant-biotic interactions as semiochemicals or within-plant defence signals. However, the full extent and mechanisms by which BXs shape the root-associated microbiome has remained largely unexplored. Here, we have taken a global approach to examine the regulatory activity of BXs on the maize root metabolome and associated bacterial and fungal communities. Using untargeted mass spectrometry analysis in combination with prokaryotic and fungal amplicon sequencing, we compared the impacts of three genetic mutations in different steps in the BX pathway. We show that BXs regulate global root metabolism and concurrently influence the rhizobiome in a root type-dependent manner. Correlation analysis between BX-controlled root metabolites and bacterial taxa suggested a dominant role for BX-dependent metabolites, particularly flavonoids, in constraining a range of soil microbial taxa, while stimulating methylophilic bacteria. Our study supports a multilateral model by which BXs control root-microbe interactions via a global regulatory function in root secondary metabolism.
- Subjects :
- Bacteria classification
Bacteria isolation & purification
Bacteria metabolism
Benzoxazines metabolism
Fungi classification
Fungi isolation & purification
Fungi metabolism
Plant Roots growth & development
Plant Roots microbiology
Poaceae metabolism
Secondary Metabolism
Soil Microbiology
Zea mays growth & development
Zea mays metabolism
Bacteria drug effects
Benzoxazines pharmacology
Fungi drug effects
Microbiota drug effects
Plant Roots metabolism
Zea mays microbiology
Subjects
Details
- Language :
- English
- ISSN :
- 1751-7370
- Volume :
- 13
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- The ISME journal
- Publication Type :
- Academic Journal
- Accession number :
- 30796337
- Full Text :
- https://doi.org/10.1038/s41396-019-0375-2