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E-GEOD-4113

ABSTRACT: Arabidopsis plants with altered levels of alternative oxidase

PROVIDER: E-GEOD-4113 | ExpressionAtlas | 2014-07-03

REPOSITORIES: ExpressionAtlas

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			Action	DRS
	E-GEOD-4113-analysis-methods.tsv	Tabular
	E-GEOD-4113-atlasExperimentSummary.Rdata	Rdata
	E-GEOD-4113-configuration.xml	Xml
	E-GEOD-4113-percentile-ranks.tsv	Tabular
	E-GEOD-4113-zoomifications-log.tsv	Tabular

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Project description:Arabidopsis plants with altered levels of alternative oxidase

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Project description:Leaf transcriptome comparison of untransformed Col-0 Arabidopsis plants with plants transformed to be anti-sense for AtAOX1a (alternative oxidase). Two “bio-replicates” were sampled, for a total of four microarray chips—Col-0 and anti-sense leaf tissue from a first planting (samples GSM45208 and GSM45231, respectively), and from a second planting made one week later (samples GSM45209 and GSM45278, respectively). See sample descriptions for growth conditions and microarray procedure. Keywords = alternative oxidase Keywords = plant mitochondria Keywords = respiration Keywords = leaves Keywords: repeat sample

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Project description:Leaf transcriptome comparison of untransformed Col-0 Arabidopsis plants with plants transformed to be anti-sense for AtAOX1a (alternative oxidase). Two âbio-replicatesâ were sampled, for a total of four microarray chipsâCol-0 and anti-sense leaf tissue from a first planting (samples GSM45208 and GSM45231, respectively), and from a second planting made one week later (samples GSM45209 and GSM45278, respectively). See sample descriptions for growth conditions and microarray procedure.

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Project description:COX17 is a soluble protein from the mitochondrial intermembrane space that participates in the transfer of copper for cytochrome c oxidase (COX) assembly in eukaryotic organisms. The function of both Arabidopsis thaliana AtCOX17 genes were studied using plants with altered expression levels of these genes. Silencing of AtCOX17-1 in a cox17-2 knockout background generates plants with smaller rosettes and decreased expression of genes involved in the response of plants to different stress conditions, including several genes that are induced by mitochondrial dysfunctions. These results together with other experiments indicate that AtCOX17 is required for optimal expression of a group of stress-responsive genes, probably as a component of signalling pathways that link stress conditions to gene expression responses.

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RNA-seq analysis of alternative splicing between two Arabidopsis accessions and its inheritance in hybrid

Project description:To uncover the possible regulatory mechanism in regulatory alternative splicing in plants evolution, we used RNA-seq to compare the transcriptomes in Arabidopsis ecotypes Col and C24. We found different class of AS types have different regulatory mechanisms in Arabidopsis and divergence of alternative splicing in different class is varied in evolution. Sequence variation analysis had found evolution divergent AS events significantly altered their sequences compared to conserved events and the variation is AS class specific.

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Arabidopsis plants with altered levels of alternative oxidase

Project description:In higher plants, various developmental and environmental conditions enhance expression of the mitochondrial alternative oxidase (AOX). In this work transgenic Arabidopsis thaliana plants were generated that either overexpress AOX or inhibit its synthesis. Gene expression following antimycin A treatment, which inhibits the cytochrome pathway in mitochondria, was studied in an AOX overexpressor line. The role of AOX in regulation of reactive oxygen species (ROS) in leaves was studied in the transgenic lines. The transgenic lines were also used to investigate the mitochondria-chloroplasts interaction in assays performed at three-times growth light. For most of the parameters measured AOX antisense lines and WT plants showed a very similar response whereas AOX sense lines differed in several aspects. An unexpected result was that AOX overexpressors had higher cellular ATP/ADP ratios as compared to WT and antisense lines. This was linked to decreased photosynthetic CO2-assimilation and O2-evolution, closed PSII reaction centers and altered Calvin cycle metabolite contents. We conclude that increased mitochondrial AOX capacity can lead to a drain of electrons from the chloroplasts causing an unfavorable redox status and thereby inhibit photosynthesis.

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