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Phytotoxic constituents from Nimbya alternantherae |
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| Authors: | Antônio J Demuner Luiz CA Barbosa Thiago AM Veiga Robert W Barreto Beatriz King-Diaz Blas Lotina-Hennsen |
| Institution: | 1. Depto de Química, Universidade Federal de Viçosa, Av. P.H. Rolfs s/n, Campus Universitario, 36571-000 Viçosa, MG, Brazil;2. Depto Fitopatologia, Universidade Federal de Viçosa, 36571-000 Viçosa, MG, Brazil;3. Depto de Bioquímica, Facultad de Química, Universidad Nacional Autónoma de México, Coyoacán, 04510 México, DF, Mexico |
| Abstract: | A phytotoxic compound identified as 6-(3,3-dimethylallyloxy)-4-methoxy-5-methylphthalide (1), was isolated from the phytopathogenic fungus Nimbya alternantherae, cultivated on solid media. Catalytic hydrogenation of 1 resulted in the quantitative formation of second compound (2). Both compounds (1, 2) act by inhibiting the ATP synthesis in spinach thylakoids. A detailed investigation on the mechanism of action indicates that compound 1 acts as a Hill reaction inhibitor and uncoupler of photosynthesis. |
| Keywords: | Natural herbicide Anamorphic fungi Weed Alligator weed Biological control Lactone Photosynthesis inhibitor |
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