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标题：Comparative phytotoxic effects of Baccharis boliviensis (Asteraceae) allelochemicals on the germination of Trichocereus pasacana (Cactaceae)
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作者：Ada Cazón ; Marta L de Viana ; José C Gianello 等
期刊名称：Ecología Austral
印刷版ISSN：1667-782X
电子版ISSN：1667-7838
出版年度：2002
卷号：12
期号：1
页码：73-78
出版社：Asociacion de Ecologia Argentina
摘要：The genus Baccharis has a wide distribution in the arid regions of Northwestern Argentina. One species of this genus, Baccharis boliviensis, growths in association with other plant species at Los Cardones National Park, Salta Province. Studies carried out on the spatial distribution of the cacti Trichocereus pasacana in relation to available space show that although cacti seeds are abundant beneath Baccharis boliviensis canopy, no adult plants are found growing in association with this species, in spite of the requirement of a nurse plant for a successful cacti establishment. Aqueous extracts from Baccharis boliviensis foliage extracted with hexane, chloroform and ethyl acetate inhibited Trichocereus pasacana germination. Chloroform was the most effective solvent for extracting the phytotoxic compounds. From this extract we isolated three flavonoids whose structures were determined by spectroscopic methods and TLC in silica gel. The germination bioassay showed that Trichocereus pasacana had a differential response to the compounds from the tested extracts. The inhibitory effect was only detected in the chloroformic extract, which suggests a synergistic effect