Abstract
Photosynthetic electron transfer was studied in thylakoids isolated from wild type, UV-B and UV-C adapted cells of Synechococcus. When thylakoids were irradiated with UV-B for 60 min, a drastic decrease in the rate of PSII electron transport chain (H 2O→BQ) had occurred in wild type cells. The UV adapted cells showed greater resistance to UV-B radiation. In contrast to this, wild type cells were highly sensitive to UV-B irradiation. The artificial electron donors DPC and NH 2OH restored the PSII activity markedly in the wild type cells. It shows that the UV-B treatment inactivates the donor side of PS II. The marked loss of PS II activity was confirmed by the immunological studies showing the content of the D1 protein of PSII reaction center and of 33 kDa of water splitting complex was diminished significantly in UV treated wild type cells where as marginal loss or enhanced synthesis of these proteins was evident in adapted cells.
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