Selective Phytotoxic Effects of Sesquiterpenoids from Sonchus arvensis as a Preliminary Approach for the Biocontrol of Two Problematic Weeds of Wheat

文献类型： 外文期刊

第一作者： Wu, Hai-Bo

作者： Wu, Hai-Bo;Ma, Lin-Hui;Li, Xi-Meng;Liu, Ting-Ting

作者机构：

关键词： Sonchus arvensis; sesquiterpenoids; selectivity phytotoxic effects; Amaranthus retroflexus; Chenopodium album

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.895； 五年影响因子：6.048 ）

ISSN： 0021-8561

年卷期： 2022 年 70 卷 30 期

页码：

收录情况： SCI

摘要： The objective of this study is to find new selective allelochemicals for managing two problematic weeds redroot pigweed (Amaranthus retroflexus) and common lambsquarters (Chenopodium album) with minimal negative effects on wheat, thereby facilitating the development of eco-friendly botanical herbicide. Three new sesquiterpenoids, sonarvenolide A-C (1-3), and nine known sesquiterpenoids (4-12) were isolated from Sonchus arvensis. Compound 1 was a rare peroxide-substituted eudesmane-type sesquiterpenoid, and compound 3 was a rare iphionane-type sesquiterpenoid. Notably, compounds 1, 3, 4, 6-8, and 11 showed selectivity phytotoxic activity. In particular, compounds 1, 3, and 4 exhibited excellent germination inhibitory effect on A. retroflexus (IC50 = 32.0-129.0 mu M), higher than that of the positive control triasulfuron (IC50 = 141.7 mu M), and compound 4 showed excellent inhibition on C. album (IC50 = 82.0 mu M), higher than that of triasulfuron (IC50 = 100.9 mu M). In addition, compounds 1, 3, and 4 showed allelopathy to the growth of two weeds, which were more potent than or close to that of triasulfuron. Furthermore, these compounds were not toxic to wheat even at a high concentration (1000 mu M). Structure-activity relationships (SARs) revealed that the presence of peroxides or the absence of hydroxyl at C-S in the eudesmane-type sesquiterpenoids could strengthen the inhibitory activities. The discovery of selective allelochemicals provides not only a new choice to control two problematic weeds of wheat but also new natural lead compounds for herbicides.

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