Abstract
Relative excitation spectra of chlorophyll a fluorescence are shown to be very close to relative action spectra of photosystem II O2 evolution in seven micro- and macro-algae of five phyla. The conditions under which this correspondence should hold, based on theoretical considerations, and the applications of this correspondence to interpretation of fluorescence excitation spectra of chlorophyll a from natural popula- tions are discussed. The spectra presented are interpreted in relation to the light-harvesting pigments and their association with the two photosystems.
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