Source:http://linkedlifedata.com/resource/pubmed/id/11607652
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
8
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| pubmed:dateCreated |
2001-10-18
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| pubmed:abstractText |
We present evidence that a novel phytochrome (other than phytochromes A and B, PHYA and PHYB) operative in green plants regulates the "twilight-inducible" expression of a plant homeobox gene (Athb-2). Light regulation of the Athb-2 gene is unique in that it is not induced by red (R)-rich daylight or by the light-dark transition but is instead induced by changes in the ratio of R to far-red (FR) light. These changes, which normally occur at dawn and dusk (end-of-day FR), also occur during the daytime under the canopy (shade avoidance). By using pure light sources and phyA/phyB null mutants, we demonstrated that the induction of Athb-2 by changes in the R/FR ratio is mediated for the most part by a novel phytochrome operative in green plants. Furthermore, PHYB plays a negative role in repressing the accumulation of Athb-2 mRNA in the dark and a minor role in the FR response. The strict correlation of Athb-2 expression with FR-induced growth phenomena suggests a role for the Athb-2 gene in mediating cell elongation. This interpretation is supported by the finding that the Athb-2 gene is expressed at high levels in rapidly elongating etiolated seedlings. Furthermore, as either R or FR light inhibits cell elongation in etiolated tissues, they also down-regulate the expression of Athb-2 mRNA. Thus, these data support the notion that changes in light quality perceived by a novel phytochrome regulate plant development through the action of the Athb-2 homeobox gene.
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| pubmed:commentsCorrections |
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-1349174,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-1675603,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-1681424,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-2152164,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-2463467,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-2606345,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-3882421,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-7849504,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-8049367,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-8106086,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-8310060,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-8364355,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-8449400,
http://linkedlifedata.com/resource/pubmed/commentcorrection/11607652-8453299
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:status |
PubMed-not-MEDLINE
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| pubmed:month |
Apr
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| pubmed:issn |
0027-8424
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| pubmed:author | |
| pubmed:issnType |
Print
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| pubmed:day |
16
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| pubmed:volume |
93
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
3530-5
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| pubmed:dateRevised |
2010-9-14
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| pubmed:year |
1996
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| pubmed:articleTitle |
Twilight-zone and canopy shade induction of the Athb-2 homeobox gene in green plants.
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| pubmed:affiliation |
Centro di studio per gli Acide Nucleici, Dipartimento e Biologia Molecolare, Università di Roma La Sapienza P.le Aldo Moro 5, Rome, Italy.
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| pubmed:publicationType |
Journal Article
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