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rdf:type |
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lifeskim:mentions |
umls-concept:C0017262,
umls-concept:C0185117,
umls-concept:C0220905,
umls-concept:C0542341,
umls-concept:C1260956,
umls-concept:C1260957,
umls-concept:C1414207,
umls-concept:C1416378,
umls-concept:C1707271,
umls-concept:C1708726,
umls-concept:C1820370,
umls-concept:C2587213,
umls-concept:C2911684
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pubmed:issue |
5
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pubmed:dateCreated |
2007-11-23
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pubmed:abstractText |
The red and far-red light-absorbing phytochromes and UV-A/blue light-absorbing cryptochromes regulate seedling de-etiolation and flowering responses. The signaling steps that mediate the photoreceptor regulation on key flowering genes remain largely unknown. We report that a previously identified photomorphogenic mutant, hypersensitive to red and blue 1 (hrb1), flowered late and showed attenuated expression of FLOWERING LOCUS T (FT) over both long days and short days. Transgenic plants that overexpress the full-length HRB1, or its C-terminal half, flowered early and accumulated more FT messages under short-day conditions. The transgenic plants also displayed hyposensitive de-etiolation phenotypes, and the expression of these phenotypes requires the action of PIF4. The double mutant of hrb1/cry2 showed a flowering phenotype and an FT expression pattern similar to hrb1 under long-day conditions, suggesting that HRB1 may function downstream of cry2 under long-day conditions. In contrast, hrb1/phyB-9 showed a flowering phenotype and an FT expression pattern similar to phyB-9 over both long days and short days, indicating a modulatory role of HRB1 in the flowering pathway mediated by phyB. Overexpression of HRB1 did not affect the expression of the central clock oscillators, TOC1 and CCA1. HRB1 therefore represents a signaling step that regulates FT expression downstream of red and blue light perception.
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pubmed:language |
eng
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pubmed:journal |
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pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Acyltransferases,
http://linkedlifedata.com/resource/pubmed/chemical/Arabidopsis Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/Basic Helix-Loop-Helix...,
http://linkedlifedata.com/resource/pubmed/chemical/CCA1 protein, Arabidopsis,
http://linkedlifedata.com/resource/pubmed/chemical/CHS protein, Arabidopsis,
http://linkedlifedata.com/resource/pubmed/chemical/CRY2 protein, Arabidopsis,
http://linkedlifedata.com/resource/pubmed/chemical/Carrier Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/Cryptochromes,
http://linkedlifedata.com/resource/pubmed/chemical/FT protein, Arabidopsis,
http://linkedlifedata.com/resource/pubmed/chemical/PHYB protein, Arabidopsis,
http://linkedlifedata.com/resource/pubmed/chemical/PIF4 protein, Arabidopsis,
http://linkedlifedata.com/resource/pubmed/chemical/Phytochrome B,
http://linkedlifedata.com/resource/pubmed/chemical/TOC1 protein, Arabidopsis,
http://linkedlifedata.com/resource/pubmed/chemical/Transcription Factors
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pubmed:status |
MEDLINE
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pubmed:month |
Dec
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pubmed:issn |
0960-7412
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pubmed:author |
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pubmed:issnType |
Print
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pubmed:volume |
52
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
937-48
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pubmed:dateRevised |
2009-11-19
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pubmed:meshHeading |
pubmed-meshheading:17916114-Acyltransferases,
pubmed-meshheading:17916114-Arabidopsis,
pubmed-meshheading:17916114-Arabidopsis Proteins,
pubmed-meshheading:17916114-Basic Helix-Loop-Helix Transcription Factors,
pubmed-meshheading:17916114-Carrier Proteins,
pubmed-meshheading:17916114-Cell Nucleus,
pubmed-meshheading:17916114-Cotyledon,
pubmed-meshheading:17916114-Cryptochromes,
pubmed-meshheading:17916114-Flowers,
pubmed-meshheading:17916114-Gene Expression Regulation, Plant,
pubmed-meshheading:17916114-Hypocotyl,
pubmed-meshheading:17916114-Light,
pubmed-meshheading:17916114-Mutation,
pubmed-meshheading:17916114-Phenotype,
pubmed-meshheading:17916114-Phytochrome B,
pubmed-meshheading:17916114-Plants, Genetically Modified,
pubmed-meshheading:17916114-Protein Structure, Tertiary,
pubmed-meshheading:17916114-Signal Transduction,
pubmed-meshheading:17916114-Transcription Factors
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pubmed:year |
2007
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pubmed:articleTitle |
HYPERSENSITIVE TO RED AND BLUE 1 and its C-terminal regulatory function control FLOWERING LOCUS T expression.
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pubmed:affiliation |
Department of Plant Biology, University of Minnesota, St Paul, MN 55108, USA.
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pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, Non-P.H.S.
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