Abstract
Summary The effects of sonic treatment of Brassica chloroplasts on photochemical activities have been investigated. Sonic treatment caused a rapid and complete abolition of the Hill reaction with NADP as electron acceptor, whereas the reaction with ferricyanide or 2,6-dichlorophenolindophenol as electron acceptor was only slightly affected by the same treatment. The addition of a catalytic amount of plastocyanin to the sonicated chloroplasts induced a marked recovery of the lost activity with respect to NADP reduction, whereas the activities with ferricyanide and 2,6-dichlorophenolindophenol were not restored. The photoreduction of NADP with ascorbate and 2,6-dichlorophenolindophenol as the electron donor was also completely abolished by sonication of the chloroplasts and completely restored by addition of plastocyanin. These experimental results are discussed with respect to the role of plastocyanin as intermediary electron carrier in the photochemical electron transport in the chloroplasts.
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