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Transcription profiling of Arabidopsis thaliana (Ler) rosette leaves treated with paraquat (methyl viologen)


ABSTRACT: We used microarrays to detail Arabidopsis gene expression in response to paraquat, a herbicide that acts as a terminal oxidant of photosystem I that in the light leads to the enhanced generation of superoxide and hydrogen peroxide inside plastids. Within a few hours after paraquat treatment changes in nuclear gene expression occur. Distinct sets of genes were activated that were different from those induced by another reactive oxygen species, singlet oxygen. Experiment Overall Design: Arabidopsis thaliana rosette leaves were harvested 1, 2, and 4 h after spraying either with a solution of 20 microM paraquat (methyl viologen, Sigma) in 0.1% Tween or with Tween alone for RNA extraction and hybridization on Affymetrix ATH1 microarrays. Plants were grown on soil for 3 weeks under continuous light at 90 mmol. m-2 . s-1. For each sample, the rosette leaves of five to six 3-week-old plants (before they start bolting) were collected for RNA extraction. Total RNAs from two separate biological experiments were pooled for the preparation of cDNA and the subsequent synthesis of biotin-labeled complementary RNA as recommended by Affymetrix.

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Christophe Laloi 

PROVIDER: E-GEOD-10464 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Rapid induction of distinct stress responses after the release of singlet oxygen in Arabidopsis.

op den Camp Roel G L RG   Przybyla Dominika D   Ochsenbein Christian C   Laloi Christophe C   Kim Chanhong C   Danon Antoine A   Wagner Daniela D   Hideg Eva E   Göbel Cornelia C   Feussner Ivo I   Nater Mena M   Apel Klaus K  

The Plant cell 20030924 10


The conditional fluorescent (flu) mutant of Arabidopsis accumulates the photosensitizer protochlorophyllide in the dark. After a dark-to-light shift, the generation of singlet oxygen, a nonradical reactive oxygen species, starts within the first minute of illumination and was shown to be confined to plastids. Immediately after the shift, plants stopped growing and developed necrotic lesions. These early stress responses of the flu mutant do not seem to result merely from physicochemical damage.  ...[more]

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