Do we ever wonder how flowers get their Colors? - Cuntorio

Anthocyanin pigments, stored in the vacuoles of petal cells change color with pH (acidity). The Japanese Morning Glory, Ipomoea tricolor var. Heavenly Blue, changes color from purple to blue in the early hours of the morning A section of the petal (B) shows the transition in color. Notice the change in cell volume (C) and pH (D) accompanying the color change. This is a caused by the induction of