Altered Profile of Secondary Metabolites in the Root Exudates of Arabidopsis ATP-Binding Cassette Transporter Mutants1[C][W][OA]

Following recent indirect evidence suggesting a role for ATP-binding cassette (ABC) transporters in root exudation of phytochemicals, we identified 25 ABC transporter genes highly expressed in the root cells most likely to be involved in secretion processes. Of these 25 genes, we also selected six f...

Full description

Saved in:
Bibliographic Details
Published in:Plant physiology (Bethesda) 2008-02, Vol.146 (2), p.762-771
Main Authors: Badri, Dayakar V, Loyola-Vargas, Victor M, Broeckling, Corey D, De-la-Peña, Clelia, Jasinski, Michal, Santelia, Diana, Martinoia, Enrico, Sumner, Lloyd W, Banta, Lois M, Stermitz, Frank, Vivanco, Jorge M
Format: Article
Language:English
Subjects:
Amino acids
ATP
Gas chromatography
Liquid chromatography
Mass spectrometry
Metabolites
Mutants
Organic acids
Phytochemicals
Secondary metabolites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Following recent indirect evidence suggesting a role for ATP-binding cassette (ABC) transporters in root exudation of phytochemicals, we identified 25 ABC transporter genes highly expressed in the root cells most likely to be involved in secretion processes. Of these 25 genes, we also selected six full-length ABC transporters and a half-size transporter for in-depth molecular and biochemical analyses. We compared the exuded root phytochemical profiles of these seven ABC transporter mutants to those of the wild type. There were three nonpolar phytochemicals missing in various ABC transporter mutants compared to the wild type when the samples were analyzed by high-performance liquid chromatography-mass spectrometry. These data suggest that more than one ABC transporter can be involved in the secretion of a given phytochemical and that a transporter can be involved in the secretion of more than one secondary metabolite. The primary and secondary metabolites present in the root exudates of the mutants were also analyzed by gas chromatography-mass spectrometry, which allowed for the identification of groups of compounds differentially found in some of the mutants compared to the wild type. For instance, the mutant Atpdr6 secreted a lower level of organic acids and Atmrp2 secreted a higher level of amino acids as compared to the wild type. We conclude that the release of phytochemicals by roots is partially controlled by ABC transporters.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.107.109587