Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of Arabidopsis defective in the expression of TGA2, TGA5, and TGA6

ABSTRACT: 12-oxo-phytodienoic acid (OPDA) and phytoprostane A1 (PPA1) are cyclopentenone oxylipins that are formed via the enzymatic; jasmonate pathway and a nonenzymatic, free radicalâcatalyzed pathway, respectively. Both types of cyclopentenone oxylipins; induce the expression of genes related to detoxification, stress responses, and secondary metabolism, a profile clearly distinct; from that of the cyclopentanone jasmonic acid. To investigate the role of TGA transcriction factors in oxylipin responses, the regulation of gene expression by OPDA and PPA1 defective in; the expression of TGA2, TGA5, and TGA6 was analyzed using; Affymetrix ATH1 chips. Experiment Overall Design: 18 hybs total

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Susanne Berger

PROVIDER: E-GEOD-10732 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

General detoxification and stress responses are mediated by oxidized lipids through TGA transcription factors in Arabidopsis.

Mueller Stefan S Hilbert Beate B Dueckershoff Katharina K Roitsch Thomas T Krischke Markus M Mueller Martin J MJ Berger Susanne S

The Plant cell 20080311 3

12-oxo-phytodienoic acid and several phytoprostanes are cyclopentenone oxylipins that are formed via the enzymatic jasmonate pathway and a nonenzymatic, free radical-catalyzed pathway, respectively. Both types of cyclopentenone oxylipins induce the expression of genes related to detoxification, stress responses, and secondary metabolism, a profile clearly distinct from that of the cyclopentanone jasmonic acid. Microarray analyses revealed that 60% of the induction by phytoprostanes and 30% of th ...[more]

PMID: 18334669

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Project description:Plant damage promotes the interaction of lipoxygenases (LOX) with fatty acids yielding 9-hydroperoxides, 13-hydroperoxides and complex arrays of oxylipins. The action of 13-LOX on linolenic acid enables production of 12-oxo-phytodienoic acid (12-OPDA) and its downstream products, termed jasmonates. As signals, jasmonates have related yet distinct roles in the regulation of plant resistance against insect and pathogen attack. A similar pathway involving 9-LOX activity on linolenic and linoleic acid leads to the 12-OPDA positional isomer, 10-oxo-11-phytodienoic acid (10-OPDA) and 10-oxo-11-phytoenoic acid (10-OPEA), respectively; however, physiological roles for 9-LOX cyclopentenones have remained unclear. In developing maize (Zea mays) leaves, southern leaf blight (Cochliobolus heterostrophus) infection results in dying necrotic tissue and the localized accumulation of 10-OPEA, 10-OPDA and a series of related 14- and 12-carbon metabolites, collectively termed ‘death acids’. 10-OPEA accumulation becomes wound-inducible within fungal-infected tissues and at physiologically relevant concentrations acts as a phytoalexin by suppressing the growth of fungi and herbivores including Aspergillus flavus, Fusarium verticillioides, and Helicoverpa zea. Unlike previously established maize phytoalexins, 10-OPEA and 10-OPDA display significant phytotoxicity. Both 12-OPDA and 10-OPEA promote the transcription of defense genes encoding glutathione S-transferases, cytochrome P450s, and pathogenesis-related proteins. In contrast, 10-OPEA only weakly promotes the accumulation of multiple protease inhibitor transcripts. Consistent with a role in dying tissue, 10-OPEA application promotes cysteine protease activation and cell death which is inhibited by overexpression of the cysteine protease inhibitor maize cystatin-9. Functions for 10-OPEA and associated death acids are consistent with specialized roles in local defense reactions. A total of 6 samples were analyzed, comprised of two treatments: 10-OPEA and DMSO carrier control (5%DMSO/0.1% Tween20 in H20), both in replicates of three.

Dataset Information

Transcription profiling of Arabidopsis defective in the expression of TGA2, TGA5, and TGA6

Publications

General detoxification and stress responses are mediated by oxidized lipids through TGA transcription factors in Arabidopsis.

Similar Datasets

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