Abstract
Triazine treatment of thylakoid membranes isolated from the primary leaves ofZea mays L. showed an 80% inhibition of photosystem (PS) 2 activity. No detectable change of PS 1 activity was found. The inhibited membranes showed a selective reduction of the most unsaturated linolenic acid (C18∶3) biosynthesis by about 15% coupled with a corresponding increase in stearic (C18∶0), oleic (C18∶1) and linoleic (C18∶2) acids. Thus the inhibition of electron transfer of PS 2 induced by triazine treatment was followed by lipid peroxidation and changes in the thylakoid membrane fluidity.
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