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The Fragaria vesca Homolog of SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 Represses Flowering and Promotes Vegetative Growth

Katriina Mouhu, Takeshi Kurokura, Elli A. Koskela, Victor A. Albert, Paula Elomaa, Timo Hytönen
Katriina Mouhu
aDepartment of Agricultural Sciences, University of Helsinki, Helsinki FIN-00014 Finland
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Takeshi Kurokura
aDepartment of Agricultural Sciences, University of Helsinki, Helsinki FIN-00014 Finland
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Elli A. Koskela
aDepartment of Agricultural Sciences, University of Helsinki, Helsinki FIN-00014 Finland
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Victor A. Albert
bDepartment of Biological Sciences, University at Buffalo, Buffalo, New York 14260
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Paula Elomaa
aDepartment of Agricultural Sciences, University of Helsinki, Helsinki FIN-00014 Finland
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Timo Hytönen
aDepartment of Agricultural Sciences, University of Helsinki, Helsinki FIN-00014 Finland
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  • For correspondence: timo.hytonen@helsinki.fi

Published September 2013. DOI: https://doi.org/10.1105/tpc.113.115055

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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.

  • Glossary

    GA
    gibberellin
    SD
    short-day
    LD
    long-day
    RNAi
    RNA interference
    HPS
    high-pressure sodium
    • Received June 18, 2013.
    • Revised August 8, 2013.
    • Accepted August 17, 2013.
    • Published September 13, 2013.
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    The Fragaria vesca Homolog of SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 Represses Flowering and Promotes Vegetative Growth
    Katriina Mouhu, Takeshi Kurokura, Elli A. Koskela, Victor A. Albert, Paula Elomaa, Timo Hytönen
    The Plant Cell Sep 2013, 25 (9) 3296-3310; DOI: 10.1105/tpc.113.115055

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    The Fragaria vesca Homolog of SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 Represses Flowering and Promotes Vegetative Growth
    Katriina Mouhu, Takeshi Kurokura, Elli A. Koskela, Victor A. Albert, Paula Elomaa, Timo Hytönen
    The Plant Cell Sep 2013, 25 (9) 3296-3310; DOI: 10.1105/tpc.113.115055
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