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Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (34): 112-120.doi: 10.11924/j.issn.1000-6850.casb2021-0785

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Allelopathy Potential and Allelochemicals Identification of Fagopyrum tataricum

Ma Guangzong1(), Yang Yunhai1, Xu Gaofeng2, Yang Shaosong2, Zhang Fudou2, Shen Shicai2(), Ye Min1()   

  1. 1State Laboratory for Conservation and Utilization of Bio-Resources in Yunnan/ Yunnan Agricultural University, Kunming 650201
    2Key Laboratory of Green Prevention and Control of Agricultural Transboundary Pests of Yunnan Province/ Agricultural Environment and Resource Research Institute, Yunnan Academy of Agricultural Sciences, Kunming 650205
  • Received:2021-08-13 Revised:2021-09-15 Online:2021-12-05 Published:2022-01-06
  • Contact: Shen Shicai,Ye Min E-mail:1178298161@qq.com;shenshicai2011@aliyun.com;yeminpc@126.com

Abstract:

To explore the allelopathy of aqueous extracts from tartary buckwheat (Fagopyrum tataricum) and its related chemical components, the allelopathic effects of different organic phase extracts from tartary buckwheat plant aqueous extract on seed germination and seedling growth of two noxious farming weeds (Digitaria sanguinalis and Bidens pilosa) were examined by bioassay, and the chemical components of petroleum ether phase and ethyl acetate phase extracts were analyzed by gas chromatography-mass spectrometry (GC-MS). The results showed that three organic phase extracts (petroleum ether phase, ethyl acetate phase and N-butanol phase) of tartary buckwheat had certain inhibitory effects on the seed germination and seedling growth of D. sanguinalis and B. pilosa. The ethyl acetate phase had the strongest inhibition that the allelopathic response index of two weeds was -1.00 (the suppression rate was 100.0%) at a concentration of 2.00 mg/mL, followed by petroleum ether phase, and the least inhibited was N-butanol phase. Overall, the inhibitory effects of the three organic phase extracts on D. sanguinalis were greater than those on B. pilosa, and the suppressed rate of root length was greater than that of stem length. A total of 41 chemical components with a content higher than 0.5% were identified in petroleum ether phase and ethyl acetate phase extracts of tartary buckwheat, of which, the main component in petroleum ether phase was 4-ethylphenol (accounting for 26.8% of the total content), and the main component in ethyl acetate phase was 2-Isopropyl-5-methyl-1-hexanol (accounting for 20.7% of total content). Our results initially confirm that tartary buckwheat has certain allelopathic effect on farmland weeds and contains some chemical components with bioactivity, but the bioactivity characteristics and mechanism of these chemical components need to be further studied.

Key words: Fagopyrum tataricum, extracts, allelopathic effect, suppression rate, allelopathic response index

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