期刊
PHYTOCHEMISTRY
卷 64, 期 1, 页码 265-273出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0031-9422(03)00324-8
关键词
Striga hermonthica; Scrophulariaceae; Desmodium uncinatum; Leguminosae; allelopathy; seed germination stimulant; radical growth inhibitor; uncinanone A, B and C
Three isoflavanones, 5,7,2',4'-tetrahydroxy-6-(3-methylbut-2-enyl)isoflavanone (1), 4,5-dihydro-5,2',4'-trihydroxy-5-isopropenylfurano-(2,3;7,6)-isoflavanone (2) and 4,5-dihydro-2'-methoxy-5,4'-dihydroxy-5-isopropenylfurano-(2,3;7,6)-isoflavanone (3) and a previously known isoflavone 5,7,4'-trihydroxyisoflavone [genistein (4)] were isolated and characterised spectroscopically from the root exudate of the legume Desmodium uncinatum (Jacq.) DC. We propose the names uncinanone A, B, and C for compounds 1, 2 and 3, respectively. Isolated fractions containing uncinanone B (2) induced germination of seeds from the parasitic weed Striga hermonthica (Del.) Benth. and fractions containing uncinanone C (3) moderately inhibited radical growth, the first example of a newly identified potential allelopathic mechanism to prevent S. hermonthica parasitism. (C) 2003 Elsevier Ltd. All rights reserved.
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