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E-MTAB-7609

ABSTRACT: Transcriptional response to wounding of Arabidopsis thaliana roots

PROVIDER: E-MTAB-7609 | ExpressionAtlas | 2019-04-05

REPOSITORIES: ExpressionAtlas

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			Action	DRS
	E-MTAB-7609-analysis-methods.tsv	Tabular
	E-MTAB-7609-analytics.tsv	Tabular
	E-MTAB-7609-atlasExperimentSummary.Rdata	Rdata
	E-MTAB-7609-configuration.xml	Xml
	E-MTAB-7609-g1_g2-mvaPlot.png	Other

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Transcriptional response to wounding of Arabidopsis thaliana roots

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Project description:This SuperSeries is composed of the following subset Series: GSE40922: Arabidopsis thaliana wild type control (C) vs Pseudomonas syringae infected (Pseu) GSE40923: Arabidopsis thaliana wild type mechanical damage (MD) vs herbivore wounding (HW) GSE40924: Arabidopsis thaliana wild type mechanical damage (MD) vs Myzus persicae wounding (Myz) Refer to individual Series

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Project description:Wounding is a primary trigger of organ regeneration but how wound stress reactivates cell proliferation and promotes cellular reprogramming remains elusive. In this study we combined the transcriptome analysis with quantitative hormonal analysis to investigate how wounding induces callus formation in Arabidopsis thaliana. Our time-course RNA-seq analysis revealed that wounding induces dynamic transcriptional changes that can be categorized into five clusters with distinct temporal patterns. Gene ontology analyses uncovered that wounding modifies the expression of hormone biosynthesis and response genes, and quantitative analysis of endogenous plant hormones revealed accumulation of cytokinin prior to callus formation. Mutants defective in cytokinin synthesis and signalling display reduced efficiency in callus formation, indicating that de novo synthesis of cytokinin has major contribution in wound-induced callus formation. We further demonstrate that type-A ARABIDOPSIS RESPONSE REGULATOR (ARR)-mediated cytokinin signalling regulates the expression of CYCLIN D3;1 (CYCD3;1) and mutations in CYCD3;1 and its homologs CYCD3;2-3 cause defects in callus formation. Our transcriptome data, in addition, showed that wounding activates multiple developmental regulators, and we found novel roles of ETHYLENE RESPONSE FACTOR 115 (ERF115) and PLETHORA3 (PLT3), PLT5, PLT7 in wound-induced callus formation. Together, this study provides novel mechanistic insights into how wounding reactivates cell proliferation during callus formation.

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