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Screening for Plant Volatile Emissions with Allelopathic Activity and the Identification of L-Fenchone and 18-Cineole from Star Anise (Illicium verum) Leaves

机译:筛选具有化感活性的植物挥发物并从八角茴香叶中提取L-Fenchone和18-Cineole

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摘要

One hundred and thirty-nine medicinal plant species were screened for their allelopathic activity through volatile emissions using as a test plant. Volatile emissions from the leaves of star anise ( ) showed the highest inhibition (100%) on the radicle and hypocotyl growth. Using headspace gas collection and gas chromatography-mass spectrometry (GC-MS), seven major volatile compounds from the leaves of star anise, including α-pinene, β-pinene, camphene, 1,8-cineole, D-limonene, camphor, and L-fenchone were detected. To determine volatile compounds that may contribute to the inhibitory activity of star anise, the allelopathic potential of individual volatiles from star anise was evaluated using the cotton swab bioassay. The EC was calculated for each of the seven identified compounds. L-fenchone showed the strongest growth inhibitory activity (EC is 1.0 ng/cm for radicle and hypocotyl growth of lettuce), followed by 1,8-cineole, and camphene. This is the first report that L-fenchone could be an important volatile allelochemical from the leaves of star anise. From the actual concentration of each volatile compound in headspace and EC value, we concluded that the four volatile compounds, including L-fenchone, 1,8-cineole, β-pinene, and camphene are the most important contributors to the volatile allelopathy of star anise.
机译:通过用作测试植物的挥发性排放物筛选了一百三十九种药用植物的化感活性。八角茴香()叶片的挥发性排放物对胚根和下胚轴的生长表现出最高的抑制作用(100%)。使用顶空气体收集和气相色谱-质谱法(GC-MS),从八角茴香叶片中提取了7种主要挥发性化合物,包括α-pine烯,β-pine烯,樟脑,1,8-桉树脑,D-柠檬烯,樟脑,和L-fenchone被检测了。为了确定可能对八角茴香的抑制活性有贡献的挥发性化合物,使用棉签生物测定法评估了八角茴香中各个挥发物的化感潜力。计算出七个已鉴定化合物的EC。 L-fenchone表现出最强的生长抑制活性(生菜的胚根和下胚轴生长EC为1.0 ng / cm),其次是1,8-桉树脑和樟脑。这是第一份关于八角茴香叶中L-替可酮可能是重要的挥发性化感物质的报告。根据顶空中每种挥发性化合物的实际浓度和EC值,我们得出结论,L-fenchone,1,8-桉树脑,β-pine烯和樟脑这四种挥发性化合物是恒星挥发性化感作用的最重要因素。茴香。

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