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  • The Company of Biologists  (2)
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  • The Company of Biologists  (2)
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  • 1
    Online Resource
    Online Resource
    Attenuation of brassinosteroid signaling enhances FLC expression and delays flowering
    The Company of Biologists ; 2007
    In:  Development Vol. 134, No. 15 ( 2007-08-01), p. 2841-2850
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    In: Development, The Company of Biologists, Vol. 134, No. 15 ( 2007-08-01), p. 2841-2850
    Abstract: A main developmental switch in the life cycle of a flowering plant is the transition from vegetative to reproductive growth. In Arabidopsis thaliana, distinct genetic pathways regulate the timing of this transition. We report here that brassinosteroid (BR) signaling establishes an unexpected and previously unidentified genetic pathway in the floral-regulating network. We isolated two alleles of brassinosteroid-insensitive 1 (bri1) as enhancers of the late-flowering autonomous-pathway mutant luminidependens(ld). bri1 was found to predominantly function as a flowering-time enhancer. Further analyses of double mutants between bri1 and known flowering-time mutants revealed that bri1also enhances the phenotype of the autonomous mutant fca and of the dominant FRI line. Moreover, all of these double mutants exhibited elevated expression of the potent floral repressor FLOWERING LOCUS C(FLC). This molecular response could be efficiently suppressed by vernalization, leading to accelerated flowering. Additionally, specific reduction of the expression of FLC via RNA interference accelerated flowering in bri1 ld double mutants. Importantly, combining the BR-deficient mutant cpd with ld also resulted in delayed flowering and led to elevated FLC expression. Finally, we found increased histone H3 acetylation at FLC chromatin in bri1 ldmutants, as compared with ld single mutants. In conclusion, we propose that BR signaling acts to repress FLC expression,particularly in genetic situations, with, for example, dominant FRIalleles or autonomous-pathway mutants, in which FLC is activated.
    Type of Medium: Online Resource
    ISSN: 1477-9129 , 0950-1991
    URL: Article
    DOI: 10.1242/dev.02866
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2007
    detail.hit.zdb_id: 2007916-3
    SSG: 12
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    FRIGIDA-ESSENTIAL 1 interacts genetically with FRIGIDA and FRIGIDA-LIKE 1 to promote the winter-annual habit of Arabidopsis thaliana
    The Company of Biologists ; 2005
    In:  Development Vol. 132, No. 24 ( 2005-12-15), p. 5471-5478
    Details
    In: Development, The Company of Biologists, Vol. 132, No. 24 ( 2005-12-15), p. 5471-5478
    Abstract: Studies of natural variation have revealed that the winter-annual habit of many accessions of Arabidopsis is conferred by two genes, FRIGIDA (FRI) and FLOWERING LOCUS C (FLC),whose activities impose a vernalization requirement. To better understand the mechanism underlying the winter-annual habit, a genetic screen was performed to identify mutants that suppress the late-flowering behavior of a non-vernalized winter-annual strain. We have identified a locus, FRIGIDA-ESSENTIAL 1 (FES1), which, like FRI, is specifically required for the upregulation of FLC expression. FES1 is predicted to encode a protein with a CCCH zinc finger, but the predicted sequence does not otherwise share significant similarity with other known proteins. fes1 is a complete suppressor of FRI-mediated delayed flowering, but has little effect on the late-flowering phenotype of autonomous-pathway mutants. Thus, FES1activity is required for the FRI-mediated winter-annual habit, but not for the similar phenotype resulting from autonomous-pathway mutations. Epistasis analysis between FES1, FRI and another specific suppressor of FRI-containing lines, FRIGIDA-LIKE 1(FRL1), indicates that these genes do not function in a linear pathway, but instead act cooperatively to promote the expression of FLC.
    Type of Medium: Online Resource
    ISSN: 1477-9129 , 0950-1991
    URL: Article
    DOI: 10.1242/dev.02170
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2005
    detail.hit.zdb_id: 2007916-3
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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