Adam S. and Murthy S. D. S.
In this investigation an attempt has been made to study the effect of Zinc on primary reactions of photosynthesis. Photosystem II mediated electron transport activity exhibited 68% loss at 180 μM concentration. The PAM kinetic measurements revealed suppression of variable fluorescence in terms of relative distance from 5.4 to 2.7 Cm during the treatment. These measurements suggest that the targets of PSII are at water oxidation complex and Light harvesting complex as multiple sites of damage in Zinc toxicity. Another target site of zinc toxicity in photosystem II is evidenced from the loss of 33kDa protein band SDS-PAGE profiles of thylakoid membranes.
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