Reference : Mutagenesis of plants overexpressing CONSTANS demonstrates novel interactions among A...
Scientific journals : Article
Life sciences : Phytobiology (plant sciences, forestry, mycology...)
Mutagenesis of plants overexpressing CONSTANS demonstrates novel interactions among Arabidopsis flowering-time genes.
Onouchi, Hitoshi [John Innes Centre > > > >]
Igeno, M. Isabel [John Innes Centre > > > >]
Périlleux, Claire mailto [Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale >]
Graves, Kathryn [John Innes Centre > > > >]
Coupland, George mailto [John Innes Centre > > > >]
Plant Cell
American Society of Plant Biologists
Yes (verified by ORBi)
[en] 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
[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.
UE - Union Européenne ; Human Frontier Science Program Organisation ; Novartis Foundation Japan ; Sainsbury Studentship
Marie Curie Research Training Grant
Researchers ; Professionals ; Students

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