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Immediate-early and delayed cytokinin response genes of Arabidopsis thaliana identified by genome-wide expression profiling reveal novel cytokinin-sensitive processes and suggest cytokinin action through transcriptional cascades

Brenner, W.G ; Romanov, G.A ; Kollmer, I ; Burkle, L ; Schmulling, T

The Plant journal : for cell and molecular biology, 2005-10, Vol.44 (2), p.314-333 [Periódico revisado por pares]

Oxford, UK: Blackwell Science Ltd

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Immediate-early and delayed cytokinin response genes of Arabidopsis thaliana identified by genome-wide expression profiling reveal novel cytokinin-sensitive processes and suggest cytokinin action through transcriptional cascades
Autor: Brenner, W.G ; Romanov, G.A ; Kollmer, I ; Burkle, L ; Schmulling, T
Assuntos: Arabidopsis - drug effects ; Arabidopsis - genetics ; Arabidopsis - metabolism ; Arabidopsis Proteins - genetics ; Arabidopsis Proteins - metabolism ; Arabidopsis thaliana ; biochemical pathways ; Biological Transport - drug effects ; Biological Transport - genetics ; cytokinin ; cytokinin dehydrogenase ; cytokinin oxidase ; cytokinins ; Cytokinins - pharmacology ; Flowers & plants ; Gene expression ; Gene Expression Profiling ; gene expression regulation ; Gene Expression Regulation, Plant - drug effects ; Gene Expression Regulation, Plant - genetics ; Genes, Immediate-Early - genetics ; Genes, Plant - genetics ; genome ; Genome, Plant ; genomics ; Hormones ; immediate‐early genes ; messenger RNA ; molecular sequence data ; Nia ; nucleotide sequences ; oxidoreductases ; plant biochemistry ; plant genetics ; plant hormones ; plant proteins ; plant response ; response genes ; RNA, Messenger - analysis ; RNA, Messenger - genetics ; seedlings ; Signal transduction ; Signal Transduction - drug effects ; Signal Transduction - genetics ; transcription (genetics) ; transcription factors ; Transcription, Genetic - drug effects ; Transcription, Genetic - genetics ; transcriptome analysis ; transgenes ; transgenic plants
É parte de: The Plant journal : for cell and molecular biology, 2005-10, Vol.44 (2), p.314-333
Notas: Present address: ETH Zürich, Swiss Federal Institute of Technology Zürich, Institute of Plant Science, Universitätstr.2, CH ‐ 8092 Zürich, Switzerland.
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Descrição: Cytokinins are hormones that regulate many developmental and physiological processes in plants. Recent work has revealed that the cytokinin signal is transduced by two-component systems to the nucleus where target genes are activated. Most of the rapid transcriptional responses are unknown. We measured immediate-early and delayed cytokinin responses through genome-wide expression profiling with the Affymetrix ATH1 full genome array (Affymetrix Inc., Santa Clara, CA, USA). Fifteen minutes after cytokinin treatment of 5-day-old Arabidopsis seedlings, 71 genes were upregulated and 11 genes were downregulated. Immediate-early cytokinin response genes include a high portion of transcriptional regulators, among them six transcription factors that had previously not been linked to cytokinin. Five plastid transcripts were rapidly regulated as well, indicating a rapid transfer of the signal to plastids or direct perception of the cytokinin signal by plastids. After 2 h of cytokinin treatment genes coding for transcriptional regulators, signaling proteins, developmental and hormonal regulators, primary and secondary metabolism, energy generation and stress reactions were over-represented. A significant number of the responding genes are known to regulate light (PHYA, PSK1, CIP8, PAT1, APRR), auxin (Aux/IAA), ethylene (ETR2, EIN3, ERFs/EREBPs), gibberellin (GAI, RGA1, GA20 oxidase), nitrate (NTR2, NIA) and sugar (STP1, SUS1) dependent processes, indicating intense crosstalk with environmental cues, other hormones and metabolites. Analysis of cytokinin-deficient 35S:AtCKX1 transgenic seedlings has revealed additional, long-lasting cytokinin-sensitive changes of transcript abundance. Comparative overlay-analysis with the software tool mapman identified previously unknown cytokinin-sensitive metabolic genes, for example in the metabolism of trehalose-6-phosphate. Taken together, we present a genome-wide view of changes in cytokinin-responsive transcript abundance of genes that might be functionally relevant for the many biological processes that are governed by cytokinins.
Editor: Oxford, UK: Blackwell Science Ltd
Idioma: Inglês;Russo

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Immediate-early and delayed cytokinin response genes of Arabidopsis thaliana identified by genome-wide expression profiling reveal novel cytokinin-sensitive processes and suggest cytokinin action through transcriptional cascades

Brenner, W.G ; Romanov, G.A ; Kollmer, I ; Burkle, L ; Schmulling, T

Oxford, UK: Blackwell Science Ltd

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