CONSTANS ACTIVATES FLOWERING LOCUS. “The FT protein is a component of the mobile flowering signal ‘florigen’ that moves upon its expression in the vascular tissue of leaves to the shoot apex. The capability of CO to induce FT expression is counteracted by several regulators that repress FT through different mechanisms or pathways, thereby preventing precocious flowering.”
https://www.sciencedirect.com/science/article/pii/S0168952510001873