Treatment of chloroplasts with the herbicide DCMU stops oxygen release and photophosphorylation. If an artificial electron acceptor is added that accepts electrons from plastoquinone, oxygen release is restored but not phosphorylation. Propose where DCMU acts to interrupt the flow of electrons between photosystems I and II. Why is DCMU an effective herbicide?

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Treatment of chloroplasts with the herbicide DCMU stops oxygen release and photophosphorylation. If an artificial electron acceptor is added that accepts electrons from plastoquinone, oxygen release is restored but not phosphorylation. Propose where DCMU acts to interrupt the flow of electrons between photosystems I and II. Why is DCMU an effective herbicide?

 

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