Does NO play a role in cytokinin signal transduction?
pmid: 18291104
Does NO play a role in cytokinin signal transduction?
We tested the hypothesis that nitric oxide (NO) plays an important role in cytokinin signaling. Inhibitors of NO‐synthase (NOS), L‐NMMA and L‐NAME, inhibited the expression of the GUS gene controlled by the cytokinin‐responsive ARR5 promoter. However, the inactive analogues D‐NMMA and D‐NAME had a similar inhibitory activity. NO donors alone did not induce GUS activity and the NO scavenger cPTIO did not prevent the induction of the ARR5 promoter by cytokinin. Northern blot analysis of the PARR5::GUS transgene and the host ARR5 gene revealed that cytokinin‐induced transcript accumulation was not altered by NMMA‐treatment, indicating that NMMA acts post‐transcriptionally. Together the data show that NO has no direct role in eliciting the primary cytokinin response in plants.
- Russian Academy of Science Russian Federation
- Freie Universität Berlin Germany
- Timiryazev Institute of Plant Physiology Russian Federation
- Russian Academy of Sciences Russian Federation
- Department of Biological Sciences Russian Federation
Amaranthus, Cytokinins, omega-N-Methylarginine, Cytokinin, Arabidopsis, Nitric oxide, Signal transduction, Nitric Oxide, Plants, Genetically Modified, NG-Nitroarginine Methyl Ester, Gene Expression Regulation, Plant, Genes, Reporter, Nitric Oxide Donors, Enzyme Inhibitors, Promoter Regions, Genetic, Glucuronidase, Signal Transduction
Amaranthus, Cytokinins, omega-N-Methylarginine, Cytokinin, Arabidopsis, Nitric oxide, Signal transduction, Nitric Oxide, Plants, Genetically Modified, NG-Nitroarginine Methyl Ester, Gene Expression Regulation, Plant, Genes, Reporter, Nitric Oxide Donors, Enzyme Inhibitors, Promoter Regions, Genetic, Glucuronidase, Signal Transduction
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