Energy transfer from carotenoids to chlorophyll in blue-green, red and green algae and greening bean leaves

Abstract

From fluorescence action spectra, fluorescence spectra and absorption spectra measured at room temperature and at 77 °K of light petroleum (b.p. 40–60°)-treated and normal chloroplasts, it is concluded that:

1. 1. In blue-green and red algae energy transfer from β-carotene to chlorophyll occurs in Photosystem I exclusively.

2. 2. In green algae and greening bean leaves energy transfer from β-carotene to chlorophyll occurs in both Photosystem I and II.

3. 3. Light absorbed by β-carotene is transferred to chlorophyll with nearly 100% efficiency.

4. 4. Light energy absorbed by xanthophylls is not transferred to chlorophyll.