| pubmed-article:11607652 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:11607652 | lifeskim:mentions | umls-concept:C2936299 | lld:lifeskim |
| pubmed-article:11607652 | lifeskim:mentions | umls-concept:C0017347 | lld:lifeskim |
| pubmed-article:11607652 | lifeskim:mentions | umls-concept:C0205263 | lld:lifeskim |
| pubmed-article:11607652 | pubmed:issue | 8 | lld:pubmed |
| pubmed-article:11607652 | pubmed:dateCreated | 2001-10-18 | lld:pubmed |
| pubmed-article:11607652 | 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. | lld:pubmed |
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| pubmed-article:11607652 | pubmed:language | eng | lld:pubmed |
| pubmed-article:11607652 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:11607652 | pubmed:status | PubMed-not-MEDLINE | lld:pubmed |
| pubmed-article:11607652 | pubmed:month | Apr | lld:pubmed |
| pubmed-article:11607652 | pubmed:issn | 0027-8424 | lld:pubmed |
| pubmed-article:11607652 | pubmed:author | pubmed-author:MorelliGG | lld:pubmed |
| pubmed-article:11607652 | pubmed:author | pubmed-author:WhitelamGG | lld:pubmed |
| pubmed-article:11607652 | pubmed:author | pubmed-author:RubertiII | lld:pubmed |
| pubmed-article:11607652 | pubmed:author | pubmed-author:CarabelliMM | lld:pubmed |
| pubmed-article:11607652 | pubmed:issnType | Print | lld:pubmed |
| pubmed-article:11607652 | pubmed:day | 16 | lld:pubmed |
| pubmed-article:11607652 | pubmed:volume | 93 | lld:pubmed |
| pubmed-article:11607652 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:11607652 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:11607652 | pubmed:pagination | 3530-5 | lld:pubmed |
| pubmed-article:11607652 | pubmed:dateRevised | 2010-9-14 | lld:pubmed |
| pubmed-article:11607652 | pubmed:year | 1996 | lld:pubmed |
| pubmed-article:11607652 | pubmed:articleTitle | Twilight-zone and canopy shade induction of the Athb-2 homeobox gene in green plants. | lld:pubmed |
| pubmed-article:11607652 | 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. | lld:pubmed |
| pubmed-article:11607652 | pubmed:publicationType | Journal Article | lld:pubmed |
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