A new photosystem II electron transfer inhibitor from Sorghum bicolor

Agnes M. Rimando, Franck E. Dayan, Mark A. Czarnota, Leslie A. Weston, Stephen O. Duke

    Research output: Contribution to journalArticlepeer-review

    108 Citations (Scopus)


    Our study of the mechanism(s) by which sorgoleone (1) acts as a photosystem II (PS II) inhibitor led to the isolation of a new benzoquinone derivative, 2-hydroxy-5-ethoxy-3-[(Z,Z)-8',11',14'-pentadecatriene]-p- benzoquinone (2), from the root exudate of sorghum. The structure of 2, which is being given the name 5-ethoxy-sorgoleone, was determined by spectroscopic means. A methoxy derivative (3) of 1 was also prepared. Both 2 and 3 caused a reduction in oxygen evolution by thylakoid membranes and induced variable chlorophyll fluorescence. These compounds, however, were less active inhibitors of PS II than 1.

    Original languageEnglish
    Pages (from-to)927-930
    Number of pages4
    JournalJournal of Natural Products
    Issue number7
    Publication statusPublished - 01 Jul 1998


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