Allelopathic Potential of Aqueous Extracts from Fleagrass ( Adenosma buchneroides Bonati) against Two Crop and Three Weed Species

Chen Wang, Jinfeng Qi, Qing Liu, Yuhua Wang and Hongbin Wang
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Chen Wang: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Jinfeng Qi: Yunnan Key Laboratory for Wild Plant Resources, Department of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
Qing Liu: Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun 666303, China
Yuhua Wang: Yunnan Key Laboratory for Wild Plant Resources, Department of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
Hongbin Wang: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China

Agriculture, 2022, vol. 12, issue 8, 1-11

Abstract: This study aimed to assess the phytotoxic potential of fleagrass ( Adenosma buchneroides ) on weeds and crops. We assessed the effects of applying aqueous extracts of fleagrass on the seed germination and seedling growth of three weeds ( Bidens pilosa, Paspalum thunbergia, and Bromus japonicus ) and two crops ( Oryza sativa and Zea mays ). The influence of six doses of fleagrass aqueous extract on seed germination and seedling growth was assessed through a Petri dish experiment. The aqueous extract of fleagrass was qualitatively characterized using widely targeted metabolomics analysis and found to mainly comprise flavonoids, phenolic acids, alkaloids, polysaccharides, phenylpropanoids, terpenoids, phenolamides, and quinones. The mean IC 50 for crop seed germination was 168,796, and the mean IC 50 for weed seed germination was 11,454. The inhibition effect on the tested species, from highest to lowest, followed the order of B. japonicus > B. Pilosa > P. thunbergii > O. sativa > Z. mays. These results indicate the remarkable species-specific sensitivity of seed germination and seedling growth to fleagrass extract treatment, and that crops are more tolerant than weeds. Elucidation of the details of the fleagrass–weed/crop interaction can serve as a basis for intercropping fleagrass with crops in weed management strategies aimed at controlling weeds.

Keywords: Adenosma buchneroides; seed germination; allelopathy; aqueous extract (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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