ニトベギク (Tithonia diversifolia (Hemsl.) A. Garay) 痩果水滲出物における sundiversifolide

概要

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The purpose of this study was to confirm the existence of sundiversifolide, 4,15-dinor-3-hydroxy-1(5)-xanthene-12,8-olide, as an allelopathic substance in two species of plants. This substance could be used to control an ecosystem by its allelopathic function. Sundiversifolide has species-specific allelopathic properties in germinating seeds (achenes) of the sunflower, Helianthus annuus L.cv. Taiyo. However, its distribution among other species of plants has not yet been elucidated. The allelopathic properties and the identification of their substances were investigated in the exudates from the achenes of the Mexican sunflower (Tithonia diversifolia (Hemsl.) A. Gray) and Leucanthemum paludosum cv. North Pole. In the exudates from the Mexican sunflower achens, the existence of sundiversifolide was identified by LC-ESI+/MS. In the exudates from the L. paludosum, sundiversifolide was not detected. The low polar fraction of the exudates from the achenes of the Mexican sunflower has an allelopathic function as does the sunflower plant. Allelopathic properties of achenes of Mexican sunflower was also examined. The ethylacetate-soluble fraction of the exudates inhibited the growth of cats-eyes (Veronica persica Poiret) seedlings and the conidial germination of useful fungi, i.e. Neurospora crassa. These allelopathic functions including sundiversifolide could be applied to regulate the growth in agricultural eco-systems.
生態工学会の論文
2006-04-30