7,8-Benzoflavone: a phytotoxin from root exudates of invasive Russian knapweed |
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Authors: | Stermitz Frank R Bais Harsh Pal Foderaro Tommaso A Vivanco Jorge M |
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Affiliation: | Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA. frslab@lamar.colostate.edu |
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Abstract: | Root exudates from Acroptilon repens (Russian knapweed) were found to be phytotoxic and the phytotoxin in the exudate was identified as 7,8-benzoflavone (alpha-naphthoflavone), (1), not previously known as a natural product. In tests on growing seedlings both 1 and its isomer 5,6-benzoflavone (2) were phytotoxic. Flavone, a structural analog of 1 and a known granular leaf and stem exudate of other plant species, was also phytotoxic and more potent than 1 or 2. |
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