The Influence of Plant Extracts on Phytotoxin Production and Growth Rate of Alternaria helianthi |
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| Authors: | D. J. Robeson G. A. Strobel |
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| Affiliation: | Department of Plant Pathology, Montana State University, Bozeman, U.S.A. |
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| Abstract: | When liquid cultures of Alternaria helianthi were supplemented with aqueous extracts of leaf tissue of its host plant (sunflower), pronounced effects on both growth and production of the toxin deoxyradicinin were apparent. Very low levels of leaf extract stimulated toxin production but did not significantly affect growth, while higher levels markedly stimulated mycelial growth and at the same time toxin production was greatly suppressed. Leaf extracts of non-host plant species were also stimulatory to phytotoxin biosynthesis. |
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