Fig. 7.

Summary of findings here and in the companion paper of positive effects (arrows) on flowering and CO/FT for two commonly used LD photoresponses. This schematic incorporates effects on FT and flowering of: mutants; gene silencing; change in light intensity; and a block to photosynthesis. Predominantly, in LD, photosynthetic sucrose amplifies CO/FT expression (see companion paper) while phytochrome acts directly and also via GA, which plays a permissive and, often, non-limiting role. There is also a direct but lesser LD-mediated increase in GA supply via the petiole response to FR-rich light. A dashed arrow indicates a potential step of regulation, and weaker responses are indicated by thinner arrows. The electronics symbol for a speaker is used to show sucrose amplification of CO/FT expression.