Linked Life Data

19473326

Source:http://linkedlifedata.com/resource/pubmed/id/19473326

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2009-9-15
pubmed:databankReference
pubmed:abstractText
Molecular genetic analyses in Arabidopsis disclosed a genetic pathway whereby flowering is induced by the photoperiod. This cascade is examined here within the time course of floral transition in the long-day (LD) plant Sinapis alba induced by a single photoperiodic cycle. In addition to previously available sequences, the cloning of CONSTANS (SaCO) and FLOWERING LOCUS T (SaFT) homologues allowed expression analyses to be performed to follow the flowering process step by step. A diurnal rhythm in SaCO expression in the leaves was observed and transcripts of SaFT were detected when light was given in phase with SaCO kinetics only. This occurred when day length was extended or when a short day was shifted towards a 'photophile phase'. The steady-state level of SaFT transcripts in the various physiological situations examined was found to correlate like a rheostat with floral induction strength. Kinetics of SaFT activation were also consistent with previous estimations of translocation of florigen out of leaves, which could actually occur after the inductive cycle. In response to one 22-h LD, initiation of floral meristems by the shoot apical meristem (SAM) started about 2 days after activation of SaFT and was marked by expression of APETALA1 (SaAP1). Meanwhile, LEAFY (SaLFY) was first up-regulated in leaf primordia and in the SAM. FRUITFULL (SaFUL) was later activated in the whole SAM but excluded from floral meristems. These patterns are integrated with previous observations concerning upregulation of SUPPRESSOR OF OVEREXPRESSION OF CO1 (SaSOC1) to provide a temporal and spatial map of floral transition in Sinapis.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
1365-313X
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
59
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
962-73
pubmed:meshHeading
pubmed-meshheading:19473326-Amino Acid Sequence, pubmed-meshheading:19473326-Arabidopsis, pubmed-meshheading:19473326-Arabidopsis Proteins, pubmed-meshheading:19473326-Cloning, Molecular, pubmed-meshheading:19473326-DNA-Binding Proteins, pubmed-meshheading:19473326-Flowers, pubmed-meshheading:19473326-Gene Expression Regulation, Developmental, pubmed-meshheading:19473326-Gene Expression Regulation, Plant, pubmed-meshheading:19473326-Genes, Plant, pubmed-meshheading:19473326-MADS Domain Proteins, pubmed-meshheading:19473326-Molecular Sequence Data, pubmed-meshheading:19473326-Photoperiod, pubmed-meshheading:19473326-Plant Proteins, pubmed-meshheading:19473326-Plants, Genetically Modified, pubmed-meshheading:19473326-Sequence Alignment, pubmed-meshheading:19473326-Sinapis, pubmed-meshheading:19473326-Transcription Factors
pubmed:year
2009
pubmed:articleTitle
Gene activation cascade triggered by a single photoperiodic cycle inducing flowering in Sinapis alba.
pubmed:affiliation
Laboratory of Plant Physiology, University of Liège, B-4000 Liège, Belgium.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't