| Title: | Selective Phytotoxic Effects of Sesquiterpenoids from Sonchus arvensis as a Preliminary Approach for the Biocontrol of Two Problematic Weeds of Wheat |
| Author(s): | Wu HB; Ma LH; Li XM; Liu TT; |
| Address: | "College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, People's Republic of China. Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China" |
| ISSN/ISBN: | 1520-5118 (Electronic) 0021-8561 (Linking) |
| Abstract: | "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 (IC(50) = 32.0-129.0 muM), higher than that of the positive control triasulfuron (IC(50) = 141.7 muM), and compound 4 showed excellent inhibition on C. album (IC(50) = 82.0 muM), higher than that of triasulfuron (IC(50) = 100.9 muM). 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 muM). Structure-activity relationships (SARs) revealed that the presence of peroxides or the absence of hydroxyl at C-5 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" |
| Keywords: | "*Amaranthus *Chenopodium album *Herbicides/chemistry/toxicity Pheromones/pharmacology Plant Weeds *Sesquiterpenes/toxicity *Sesquiterpenes, Eudesmane/pharmacology *Sonchus Triticum Amaranthus retroflexus Chenopodium album Sonchus arvensis selectivity phyt;" |
| Notes: | "MedlineWu, Hai-Bo Ma, Lin-Hui Li, Xi-Meng Liu, Ting-Ting eng 2022/07/26 J Agric Food Chem. 2022 Aug 3; 70(30):9412-9420. doi: 10.1021/acs.jafc.2c03462. Epub 2022 Jul 25" |
