作者:Toshiro Fukushima、Masayasu Tanaka、Masatoshi Gohbara、Takane Fujimori
DOI:10.1016/s0031-9422(97)01023-6
日期:1998.6
A culture broth of Nigrospora sacchari showed strong herbicidal activity in treatment of intact greenhouse-grown plants. Three lactones were isolated from the culture broth. The. major compound, which exhibited the most significant effect of the fungal metabolites in the assay procedures, was identified as (+)-phomalactone, 6-(1-propenyl)-5,6-dihydro-5-hydroxy-2H pyran-2-one. Others were 5-[1-(1-hydroxybut-2-enyl)]-furan-2-one and 5-[1-(1-hydroxybut-2-enyl)l-dihydrofuran These fungal metabolites were investigated for their herbicidal effects in an electrolyte leakage assay and the results obtained appeared to indicate that the herbicidal damage was caused by cellular disruption. Phomalactone caused remarkable and rapid electrolyte leakage on cucumber cotyledon discs at concentrations higher than 50 ppm. (C) 1998 Elsevier Science Ltd. All rights reserved.