photosystem

Plants need light to grow, but too much light can induce damage to the photosynthetic complex known as photosystem II. It is known that plants adapted to growing under full sun repair this light-induced damage more.

An early stage that involved cyanobacteria innovating a new pigment, chlorophyll f, enabling the photosystem to harvest far-red light for the first time.

In addition, they developed a modified photosystem that could use this pigment to power the oxygen release reaction using only the lower energy red light.

The late stage, occurring approximately 2 billion years ago, further optimized the capacity to harvest far-red light by evolving a second modified photosystem incorporating chlorophyll f at critical locations.

How might corallicolids avoid the toxic chemical effects resulting from the excitation of chlorophyll by light when they lack the normal outlet of a photosystem?