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Reference: Helen Fones, Calum A. R. Davis, Arantza Rico et al., (2010). Metal hyperaccumulation armors plants against disease. PLoS Pathogens, 6 (9), Article: e10001093.Citable link to this page:

 

Metal hyperaccumulation armors plants against disease

Abstract: Metal hyperaccumulation, in which plants store exceptional concentrations of metals in their shoots, is an unusual trait whose evolutionary and ecological significance has prompted extensive debate. Hyperaccumulation plants are usually found on metalliferous soils, and it has been proposed that hyperaccumulation provides a defense against herbivores and pathogens, an idea termed the 'elemental defense' hypothesis. We have investigated this hypothesis using the crucifer Thlaspi caerulescens, a hyperaccumulator of zinc, nickel, and cadmium, and the baterial pathogen Pseudomonas syringae pv. maculicola (Psm). Using leaf innoculation assays, we have shown that hyperaccumulation of any of the three metals inhibits growth of Psm in planta. Metal concentrations in the bulk leaf and in the apoplast, through which the pathogen invades the leaf, were shown to be sufficient to account for the defensive effect by comparison with in vitro dose-response curves. Further, mutants of Psm with increased and decreased zinc tolerance created by transposon insertion had either enhanced or reduced ability, respectively, to grow in high-zinc plants, indicating that the metal affects the pathogen directly. Finally, we have shown that bacteria naturally colonizing T. caerulescens leaves at the site of a former lead-zinc mine have high zinc tolerance compared with bacteria isolated from non-accumulating plants, suggesting local adaptation to high metal. These results demonstrate that the disease resistance observed in metal-exposed T. caerulescens can be attributed to a direct effect of metal hyperaccumulation, which may thus be functionally analogous to the resistance conferred by antimicrobial metabolites in non-accumulating plants.

Publication status:PublishedPeer Review status:Peer reviewedVersion:Publisher's version Funder: Society for General Microbiology   Funder: British Society for Plant Pathology   Notes:© 2010 Fones et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Bibliographic Details

Publisher: Public Library of Science

Publisher Website: http://www.plos.org/

Host: PLoS Pathogenssee more from them

Publication Website: http://www.plospathogens.org

Issue Date: 2010-September

Copyright Date: 2010

pages:Article: e10001093Identifiers

Doi: https://doi.org/10.1371/journal.ppat.1001093

Issn: 1553-7366

Eissn: 1553-7374

Urn: uuid:51a3644b-17da-40f7-924c-95ec9f917bd0 Item Description

Type: Article: post-print;

Language: en

Version: Publisher's versionKeywords: metal hyperaccumulationSubjects: Plant Sciences Tiny URL: ora:4586

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Author: Helen Fones - institutionUniversity of Oxford facultyMathematical,Physical and Life Sciences Division - Plant Sciences fundingNat

Source: https://ora.ox.ac.uk/objects/uuid:51a3644b-17da-40f7-924c-95ec9f917bd0



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