The EMBO journal, 2007-11, Vol.26 (22), p.4756-4767
2007
Details
- Autor(en) / Beteiligte
- Titel
- Interaction of shade avoidance and auxin responses: a role for two novel atypical bHLH proteins
- Ist Teil von
- The EMBO journal, 2007-11, Vol.26 (22), p.4756-4767
- Ort / Verlag
- Chichester, UK: John Wiley & Sons, Ltd
- Erscheinungsjahr
- 2007
- Link zum Volltext
- Quelle
- Wiley Online Library Journals Frontfile Complete
- Beschreibungen/Notizen
- Plants sense the presence of potentially competing nearby individuals as a reduction in the red to far‐red ratio of the incoming light. In anticipation of eventual shading, a set of plant responses known as the shade avoidance syndrome (SAS) is initiated soon after detection of this signal by the phytochrome photoreceptors. Here we analyze the function of PHYTOCHROME RAPIDLY REGULATED1 (PAR1) and PAR2, two Arabidopsis thaliana genes rapidly upregulated after simulated shade perception. These genes encode two closely related atypical basic helix–loop–helix proteins with no previously assigned function in plant development. Using reverse genetic approaches, we show that PAR1 and PAR2 act in the nucleus to broadly control plant development, acting as negative regulators of a variety of SAS responses, including seedling elongation and photosynthetic pigment accumulation. Molecularly, PAR1 and PAR2 act as direct transcriptional repressors of two auxin‐responsive genes, SMALL AUXIN UPREGULATED15 (SAUR15) and SAUR68. Additional results support that PAR1 and PAR2 function in integrating shade and hormone transcriptional networks, rapidly connecting phytochrome‐sensed light changes with auxin responsiveness.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0261-4189eISSN: 1460-2075DOI: 10.1038/sj.emboj.7601890Titel-ID: cdi_pubmedcentral_primary_oai_pubmedcentral_nih_gov_2080812
- Format
- –
- Schlagworte
- 2,4-Dichlorophenoxyacetic Acid - pharmacology, Adaptation, Biological, Amino Acid Sequence, Arabidopsis, Arabidopsis - anatomy & histology, Arabidopsis - drug effects, Arabidopsis - genetics, Arabidopsis - metabolism, Arabidopsis Proteins - genetics, Arabidopsis Proteins - metabolism, Arabidopsis thaliana, auxin, auxin responsive genes, auxins, basic helix-loop-helix proteins, Basic Helix-Loop-Helix Transcription Factors - genetics, Basic Helix-Loop-Helix Transcription Factors - metabolism, Botany, Cycloheximide - pharmacology, Dexamethasone - pharmacology, DNA, Plant - genetics, gene expression regulation, Genetics, Glucocorticoids - pharmacology, Herbicides - pharmacology, Indoleacetic Acids - metabolism, Light, Molecular biology, Molecular Sequence Data, PAR1 gene, PAR2 gene, Phenotype, phytochrome, plant growth, Plants, Genetically Modified - anatomy & histology, Plants, Genetically Modified - drug effects, Plants, Genetically Modified - genetics, Plants, Genetically Modified - metabolism, Protein Synthesis Inhibitors - pharmacology, Proteins, SAUR, SAUR15 gene, SAUR68 gene, Sequence Analysis, DNA, shade, shade avoidance, Sunlight, transcription (genetics), transcription factors