Campus Professora Cinobelina Elvas, Federal University of Piauí, Bom Jesus, PI, 64900-000, Brazil.
Sci Rep. 2022 Aug 5;12(1):13476. doi: 10.1038/s41598-022-16203-5.
Plant species with allelopathic effects against weeds have emerged as a potential strategy for the development of ecologically friendly bioherbicides. In this study, the allelopathic effects of the plant species Dipteryx lacunifera Ducke, Ricinus communis L., Piper tuberculatum Jacq., and Jatropha gossypiifolia L. on the weed Bidens bipinnata L. were investigated. In vitro bioassays revealed that aqueous extracts of selected plant species were able to inhibit seed germination and seedling growth of B. bipinnata, highlighting the strongest allelopathic effect evidenced by R. communis. The phytotoxicity of the aqueous extracts was evaluated in pot experiments, which indicated that the foliar application of R. communis and P. tuberculatum extracts on B. bipinnata plants caused yellowing of leaves, affecting the chlorophyll content and reducing growth. The discrimination of the plant extracts by attenuated total reflectance Fourier transform mid-infrared (ATR FT-MIR) spectroscopy combined with principal component analysis (PCA) indicated the presence of allelochemical compounds, such as phenolics and terpenoids, which may be associated with allelopathic activity. Overall, this study provides valuable information about the substantial allelopathic inhibitory effects of the plant species R. communis and P. tuberculatum on the weed B. bipinnata, which may be used for the development of eco-friendly bioherbicides.
具有化感作用的植物物种已成为开发生态友好型生物除草剂的一种潜在策略。本研究探讨了植物物种翼核果、蓖麻、胡椒和麻疯树对杂草三叶鬼针草的化感作用。体外生物测定表明，所选植物物种的水提物能够抑制三叶鬼针草的种子萌发和幼苗生长，其中蓖麻表现出最强的化感效应。盆栽实验评估了水提物的植物毒性，结果表明，将蓖麻和胡椒的叶部提取物施用于三叶鬼针草植株上会导致叶片发黄，影响叶绿素含量并抑制生长。衰减全反射傅里叶变换中红外（ATR FT-MIR）光谱结合主成分分析（PCA）对植物提取物的区分表明，存在化感化合物，如酚类和萜类化合物，这可能与化感活性有关。总的来说，本研究提供了关于植物物种蓖麻和胡椒对杂草三叶鬼针草具有实质性化感抑制作用的有价值信息，这可能用于开发生态友好型生物除草剂。
