Abstract
We studied photosystem (PS) I /II in Acaryochloris cells with different phycobilion contents. This oxygenic prokaryote has Chl d as a major pigments. Although the special pair in PS I have been identified as Chl d dimmer P740 in this organism, little is known about the components in PS II. The relationship between phycobilin and PS II is unknown too. We measured the activity and amount of the pigments in two types of cells of Acaryochloris with different ratios of phycobilin to Chl d. The ratio of PS I/PS II was determined based on the measurements of YD* and P740+ ESR signals. Low temperature absorption and the fluorescence spectra, delayed fluorescence from PS II were also measured. Features of PS I and PS II reaction centers were discussed based on these results.
