Document Type
Article
Author ORCID Identifier
Anne J. Anderson https://orcid.org/0000-0002-0463-2174
David W. Britt https://orcid.org/0000-0002-9753-6404
Joan E. McLean https://orcid.org/0000-0002-9252-8683
Journal/Book Title
Plants
Publication Date
3-7-2023
Publisher
MDPI AG
Volume
12
Issue
6
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Abstract
The essential metals Cu, Zn, and Fe are involved in many activities required for normal and stress responses in plants and their microbiomes. This paper focuses on how drought and microbial root colonization influence shoot and rhizosphere metabolites with metal-chelation properties. Wheat seedlings, with and without a pseudomonad microbiome, were grown with normal watering or under water-deficit conditions. At harvest, metal-chelating metabolites (amino acids, low molecular weight organic acids (LMWOAs), phenolic acids, and the wheat siderophore) were assessed in shoots and rhizosphere solutions. Shoots accumulated amino acids with drought, but metabolites changed little due to microbial colonization, whereas the active microbiome generally reduced the metabolites in the rhizosphere solutions, a possible factor in the biocontrol of pathogen growth. Geochemical modeling with the rhizosphere metabolites predicted Fe formed Fe–Ca–gluconates, Zn was mainly present as ions, and Cu was chelated with the siderophore 2'-deoxymugineic acid, LMWOAs, and amino acids. Thus, changes in shoot and rhizosphere metabolites caused by drought and microbial root colonization have potential impacts on plant vigor and metal bioavailability.
First Page
1
Last Page
21
Recommended Citation
Anderson, A.J.; Hortin, J.M.; Jacobson, A.R.; Britt, D.W.; McLean, J.E. Changes in Metal-Chelating Metabolites Induced by Drought and a Root Microbiome in Wheat. Plants 2023, 12, 1209. https://doi.org/10.3390/plants12061209
