title: The Fragaria vesca homolog of suppressor of overexpression of constans1 represses flowering and promotes vegetative growth.
abstract: In the annual long-day plant Arabidopsis thaliana, suppressor of overexpression of constans1 (SOC1) integrates endogenous and environmental signals to promote flowering. We analyzed the function and regulation of the SOC1 homolog (Fragaria vesca [Fv] SOC1) in the perennial short-day plant woodland strawberry (Fragaria vesca). We found that Fv SOC1 overexpression represses flower initiation under inductive short days, whereas its silencing causes continuous flowering in both short days and noninductive long days, similar to mutants in the floral repressor Fv terminal flower1 (Fv TFL1). Molecular analysis of these transgenic lines revealed that Fv SOC1 activates Fv TFL1 in the shoot apex, leading to the repression of flowering in strawberry. In parallel, Fv SOC1 regulates the differentiation of axillary buds to runners or axillary leaf rosettes, probably through the activation of gibberellin biosynthetic genes. We also demonstrated that Fv SOC1 is regulated by photoperiod and Fv flowering locus T1, suggesting that it plays a central role in the photoperiodic control of both generative and vegetative growth in strawberry. In conclusion, we propose that Fv SOC1 is a signaling hub that regulates yearly cycles of vegetative and generative development through separate genetic pathways.
authors.affiliation: Department of Agricultural Sciences, University of Helsinki, Helsinki FIN-00014 Finland.
authors.forename: Katriina
authors.initials: K
authors.lastname: Mouhu
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kurokura
authors.forename: Elli A
authors.initials: EA
authors.lastname: Koskela
authors.forename: Victor A
authors.initials: VA
authors.lastname: Albert
authors.forename: Paula
authors.initials: P
authors.lastname: Elomaa
authors.forename: Timo
authors.initials: T
authors.lastname: Hytönen
mesh_terms: D001483:Base Sequence; D035264:Flowers / Q000235:genetics / Q000254:growth & development / Q000502:physiology; D031985:Fragaria / Q000235:genetics* / Q000254:growth & development / Q000528:radiation effects; D015870:Gene Expression; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D005875:Gibberellins / Q000235:genetics / Q000378:metabolism*; D026161:MADS Domain Proteins / Q000235:genetics / Q000378:metabolism; D008954:Models, Biological; D008969:Molecular Sequence Data; D009154:Mutation; D017440:Photoperiod; D010802:Phylogeny; D010937:Plant Growth Regulators / Q000235:genetics / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D018520:Plant Shoots / Q000235:genetics / Q000254:growth & development / Q000528:radiation effects; D030821:Plants, Genetically Modified; D012621:Seasons; D036226:Seedlings / Q000235:genetics / Q000254:growth & development / Q000528:radiation effects; D017422:Sequence Analysis, DNA; D015398:Signal Transduction
chemical_list: D005875:Gibberellins; D026161:MADS Domain Proteins; D010937:Plant Growth Regulators; D010940:Plant Proteins
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