Abstract
Summary Photosystems (PS) I and II isolated from barley thylakoids supported linolenic acid-dependent bleaching of chlorophyll. This «chlorophyll oxidase» activity was virtually absent from the purified light harvesting complex (LHC). PS I and PS II were practically free of cytochromes. On a chlorophyll basis they bleached chlorophyll at rates comparable to the rates measured in whole thylakoids. Thylakoids as well as PSI were able to bleach the chlorophyll of LHC added to them, the reaction following Michaelis-Menten Kinetics with an apparent K M of ca 30μM chlorophyll. Chlorophyll oxidase appears to be a general property of thylakoids (photosystems) as demonstrated by tests with thylakoids isolated from several plant species.
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