Article (Scientific journals)
Mutagenesis of plants overexpressing CONSTANS demonstrates novel interactions among Arabidopsis flowering-time genes.
Onouchi, Hitoshi; Igeno, M. Isabel; Périlleux, Claire et al.
2000In Plant Cell, 12 (6), p. 885-900
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Keywords :
Arabidopsis/genetics/growth & development; Arabidopsis Proteins; Circadian Rhythm; DNA-Binding Proteins/genetics/metabolism; Gene Expression Regulation, Developmental; Gene Expression Regulation, Plant; MADS Domain Proteins; Mutagenesis, Site-Directed; Photoperiod; Plant Proteins/genetics/metabolism; Plants, Genetically Modified; Suppression, Genetic; Transcription Factors/genetics/metabolism
Abstract :
[en] CONSTANS (CO) promotes flowering of Arabidopsis in response to long photoperiods. Transgenic plants carrying CO fused with the cauliflower mosaic virus 35S promoter (35S::CO) flowered earlier than did the wild type and were almost completely insensitive to length of day. Genes required for CO to promote flowering were identified by screening for mutations that suppress the effect of 35S::CO. Four mutations were identified that partially suppressed the early-flowering phenotype caused by 35S::CO. One of these mutations, suppressor of overexpression of CO 1 (soc1), defines a new locus, demonstrating that the mutagenesis approach is effective in identifying novel flowering-time mutations. The other three suppressor mutations are allelic with previously described mutations that cause late flowering. Two of them are alleles of ft, indicating that FT is required for CO to promote early flowering and most likely acts after CO in the hierarchy of flowering-time genes. The fourth suppressor mutation is an allele of fwa, and fwa soc1 35S::CO plants flowered at approximately the same time as co mutants, suggesting that a combination of fwa and soc1 abolishes the promotion of flowering by CO. Besides delaying flowering, fwa acted synergistically with 35S::CO to repress floral development after bolting. The latter phenotype was not shown by any of the progenitors and was most probably caused by a reduction in the function of LEAFY. These genetic interactions suggest models for how CO, FWA, FT, and SOC1 interact during the transition to flowering.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Onouchi, Hitoshi;  John Innes Centre
Igeno, M. Isabel;  John Innes Centre
Périlleux, Claire ;  Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale
Graves, Kathryn;  John Innes Centre
Coupland, George;  John Innes Centre
Language :
English
Title :
Mutagenesis of plants overexpressing CONSTANS demonstrates novel interactions among Arabidopsis flowering-time genes.
Publication date :
2000
Journal title :
Plant Cell
ISSN :
1040-4651
eISSN :
1532-298X
Publisher :
American Society of Plant Biologists, Rockville, United States - Maryland
Volume :
12
Issue :
6
Pages :
885-900
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Marie Curie Research Training Grant
Funders :
UE - Union Européenne [BE]
Human Frontier Science Program Organisation
Novartis Foundation Japan
Sainsbury Studentship
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since 21 January 2010

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