Abstract
In order to investigate the regulation of energy distribution between the two photosystems of photosynthesis under conditions of high photosystem I (PS I) activity, phosphorylation of the light-harvesting chlorophyll a,b- protein complex (LHC) under light 1 and light 2 conditions and fluorescence emission under autotrophic and under photoheterotrophic growth conditions have been studied in two volvocean algae, Chlamydobotrys stellata and Chlamydomonas reinhardii. The two algae were chosen in this comparative study because Chl. stellata has the unique capability to adjust its photosynthetic electron transport capacity to the special conditions of a high PS I requirement, whereas Chl. reinhardii, even though belonging to the same systematic order, behaves like green plants in general. A PS II dependent phosphorylation of LHC is detectable only in Chl. reinhardii. On the other hand, a change in nutrition from autotrophy to photoheterotrophy effects the PS I energy supply in Chl. stellata only. These observations strongly suggest that the regulation of energy influx into PS I in Chl. stellata is brought about by the special light-harvesting chlorophyll-protein complex (LHCa) [1,2] present in the photoheterotrophically grown alga.
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