THE CONTINUOUS FLOWERING GENE IN ROSE IS A FLORAL INHIBITOR

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.

VI International Symposium on Rose Research and Cultivation

L. Hibrand-Saint Oyant, M. Randoux, J. Jeauffre, T. Thouroude, S. Pierre, M.J. Jammes, J.P. Reynoird , F. Foucher

recurrent blooming, floral repressor, TFL1, RoKSN, transgenic

https://doi.org/10.17660/ActaHortic.2015.1064.13