Figure 3.

SD plants and flowering control. Yellow color represents daylight or lighting and black color the night or dark induced by covering the plants. LED light with emission at 730 nm converts the Pfr into Pr and inhibits the flowering of SD plants, overcoming the critical time threshold. On a biochemical level, right graph, nighttime reduces the Pfr level, and the induction of SD plant flowering occurs when the Pfr level declines below a critical concentration threshold. Night extension by covering the plants induces flowering and it is a strategy used in summer for inducing flowering of SD plants.