Information de reference pour ce titreAccession Number: | 00008572-200603060-00001.
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Author: | Sheldon, Candice C. *; Finnegan, E. Jean; Dennis, Elizabeth S.; Peacock, W. James
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Institution: | Commonwealth Scientific and Industrial Research Organization, Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
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Title: | |
Source: | Plant Journal. 45(6):871-883, March 2006.
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Abstract: | Summary: Prolonged exposure to cold results in early flowering in Arabidopsis winter annual ecotypes, with longer exposures resulting in a greater promotion of flowering than shorter exposures. The promotion of flowering is mediated through an epigenetic down-regulation of the floral repressor FLOWERING LOCUS C (FLC). We present results that provide an insight into the quantitative regulation of FLC by vernalization. Analysis of the effect of seed or plant cold treatment on FLC expression indicates that the time-dependent nature of vernalization on FLC expression is mediated through the extent of the initial repression of FLC and not by affecting the ability to maintain the repressed state. In the over-expression mutant flc-11, the time-dependent repression of FLC correlates with the proportional deacetylation of histone H3. Our results indicate that sequences within intron 1 and the activities of both VERNALIZATION1 (VRN1) and VERNALIZATION2 (VRN2) are required for efficient establishment of FLC repression; however, VRN1 and VRN2 are not required for maintenance of the repressed state during growth after the cold exposure. SUPPRESSOR OF OVER-EXPRESSION OF CO 1 (SOC1), a downstream target of FLC, is quantitatively induced by vernalization in a reciprocal manner to FLC. In addition, we show that SOC1 undergoes an acute induction by both short and long cold exposures.
Copyright (C) 2006 Blackwell Publishing Ltd.
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Author Keywords: | vernalization; flowering; FLOWERING LOCUS C; SUPPRESSOR OF OVER-EXPRESSION OF CO 1; chromatin; Arabidopsis.
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Language: | English.
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Document Type: | Original Article.
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Journal Subset: | Life Sciences.
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ISSN: | 0960-7412
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NLM Journal Code: | bru, 9207397
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