What pigment causes the deep purple hue in certain tomato varieties?
Anthocyanins
The striking, deep purple coloration observed in specific tomato cultivars is directly attributable to the accumulation of anthocyanins. Anthocyanins belong to a class of pigments widely recognized for providing the vibrant colors—such as blues, purples, and reds—found in many fruits and vegetables, notably blueberries and dark grapes. While conventional red tomatoes derive their color from lycopene, the introduction or up-regulation of the genetic pathways responsible for producing anthocyanins is what creates the distinctive dark hue in these specialized varieties. This pigment shift signifies not just an aesthetic change but a consequential chemical difference in the fruit's composition, which carries significant dietary implications due to the associated antioxidant properties.
