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Submitted to: Phytopathology
Publication Type: Abstract Only Publication Acceptance Date: 8/16/1995 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Fusarium spp. from the sections Liseola [F. moniliforme (FM), F. subglutinans (FS), F. proliferatum (FP) from the host corn], Martiella and Ventricosum [4-F. solani (FSo) from the hosts soybeans and potatoes] and Elegans (F. oxysporium (FO) host unknown] were each grown on rice for three weeks and then examined for production of substances inhibitory (IS) to the duckweed Lemna minor L (LM). Aqueous methanol extracts of rice culture material (RCM) obtained from each Fusarium sp. contained IS to LM. The RCM extracts were chromatographed by reverse-phase C18 column chromatography using a water-methanol gradient. LM bioassay directed-fractionation led to the identification of the following IS: fumonisins were detected in FM and FP RCM; moniliformin in FS, FP, and FSo RCM; and fusaric acid in FO RCM. Several fractions obtained from the reverse phase column chromatography of extracts from each of these species also contained IS other than the ones identified. IS were studied by spectroscopic methods, and evidence will be presented to show that one such metabolite is an isomer of fusaric acid and another has a molecular formula of C30H28O5 and one is a substituted tetrahydrofuran. It is not known how these latter metabolites inhibit plant functions. |
