Xanthophylls (oxygenated carotenoids) are also found in zooxanthellae. Two xanthophylls (diadinoxanthin and diatoxanthin) play an important role in protecting symbiotic algae and coral hosts from excessive light energy. When light energy is sufficient enough to effect pH changes within the photosynthetic apparatus of zooxanthellae, diadinoxanthin is converted to diatoxanthin. This conversion shunts light energy away from photosynthesis. In darkness, the process reverses, and diatoxanthin becomes diadinoxanthin. Note that these xanthophylls both absorb some violet but most strongly blue wavelengths at ~450 - 490nm. See Figure 28.
a major contributer
to sands in some systems.
contain chlorophylls and , while the accessory pigments are carotenoids and xanthophylls, including fucoxanthin, a brown-colored pigment that gives these algae their characteristic dark color.
contain chlorophylls and , and their accessory pigments are carotenoids, xanthophyll, phycoerythrin, and, phycobilins.
Phycoerythrin are capable of absorbing shorter wavelengths of light, but may also protect photosynthetic pathways from very intense light levels.
Photosynthesis Photosynthesis and ..
Scientists have long known that xanthophylls and carotenoids play an important part in photosynthesis by helping to capture light energy, but the benefit of anthocyanins is not well understood. It might seem more logical for plants to remove all the carbohydrates they possibly can from the leaf before making it fall off.