The creeping weed, Chrysopogon aciculatus (Retz.) Trin., is widely known for its use as folk medicine, while its phytotoxic potential has not been examined. Therefore, we carried out an investigation into the phytotoxic potential of C. aciculatus to identify phytotoxic substances. C. aciculatus extracts showed inhibitory effects on shoot and root growth of cress, lettuce, rapeseed, and Italian ryegrass. Inhibition was both species‐dependent and concentration‐dependent. Two substances, (9S,10E,12Z)‐9‐hydroxyoctadeca‐10,12‐dienoic acid (9‐HO‐ODDEA) and rhizopycnin A, were isolated using chromatographies and characterized by spectral analysis. 9‐HO‐ODDEA retarded shoot and root growth of cress at concentrations higher than 1.0 and 0.3 mM, respectively, while on cress seedling by rhizopycnin A, the inhibition began from 1.0 mM. The concentrations needed for 50% inhibition of the shoot and root growth of test plants ranged from 1.71–2.31, and 0.71–0.72 mM for 9‐HO‐ODDEA and rhizopycnin A, respectively. These results indicate that these substances may contribute, to a certain extent, to the phytotoxic activity of C. aciculatus.

中文翻译：

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扁柏（Chrysopogon aciculatus）的植物毒性潜力。（禾本科）

creep草（Chrysopogon aciculatus（Retz。）Trin。）因其作为民间药物而广为人知，而其植物毒性潜力尚未得到检验。因此，我们进行了一项调查，以鉴定针形衣藻的植物毒性潜力。针形衣藻提取物对水芹，生菜，油菜籽和意大利黑麦草的芽和根生长具有抑制作用。抑制作用既取决于物种，也取决于浓度。两种物质，（9 S，10 E，12 Z）-9-羟基十八烷基-10,12-二烯酸（9-HO-ODDEA）和根霉菌素A使用色谱法分离并通过光谱分析进行表征。9-HO-ODDEA分别在高于1.0和0.3 mM的浓度下延迟水芹的芽和根生长，而在根瘤菌素A上对水芹幼苗的抑制作用始于1.0 mM。对于50％抑制9-HO-ODDEA和根瘤菌素A，受试植物的芽和根生长所需的浓度分别为1.71–2.31和0.71–0.72 mM。这些结果表明，这些物质可能在一定程度上促进了针形衣藻的植物毒性活性。