Syracuse

The Continuous Flowering Gene in Rose Is a Floral Inhibitor

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Hibrand-Saint Oyant, Laurence | Randoux, Marie | Jeauffre, Julien | Thouroude, Tatiana | Pierre, Sandrine | Jammes, Marie-José | Reynoird, J. P. | Foucher, Fabrice

Edité par CCSD ; International Society for Horticultural Science (ISHS) -

International audience. In rose, RoKSN, a TFL1 homologue, is a key regulator of continuous flowering. To study the function of this gene in planta, protocols of plant transformation are needed. We complemented tfl1 Arabidopsis mutants and ectopically expressed RoKSN in a continuous-flowering rose. In Arabidopsis, RoKSN complemented the tfl1 mutant by rescuing late flowering and indeterminate growth. In continuous-flowering rose, the ectopic expression of RoKSN led to the absence of flowering. In these transgenic roses, a study of genes implied in the floral regulation was carried out. The floral activator transcripts decreased whereas the FD transcription factor is up-regulated. We conclude that RoKSN is a floral repressor and could regulate the expression of transcripts as RoFT and RoFD. These results could strengthen a mechanism of competitive interactions of RoFT and RoKSN with a common partner, FD to move towards flowering or vegetative developments.

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