Abstract
Cyanophage N-1-infectedNostoc muscorum cells were unable to carry out oxygen evolution and photosystem-II-dependent electron transport (H2O→DCPIP). This was associated with preferential degradation of phycobiliproteins. Such cells also exhibited decreased rate of ferredoxin:NADP+ oxidoreductase activity. However, Ca2+-dependent ATPase activity was maintained at a higher level (80%). The results suggested that virus development proceeds in the absence of photosystem-II activity, and the energy is provided by cyclic photophosphorylation aside from that possibly obtained via degradation of carbohydrate reserves.
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