The chemical profile and phytotoxic action of Hibiscus trionum essential oil (EO) was studied. In total 17 compounds were identified via GC/MS, representing 94.18% of the entire oil, with phytol (40.37%) being the dominant constituent. Bioassay revealed that the EO inhibited root elongation of Medicago sativa and Amaranthus retroflexus by 32.66% and 61.86% at 5 mg/mL, respectively; meanwhile, the major component phytol also exhibited significant phytotoxic activity, suppressing radical elongation of Pennisetum alopecuroides , M. sativa and A. retroflexus by 26.08%, 27.55% and 43.96% at 1 mg/mL, respectively. The fact that the EO showed weaker activity than phytol implied that some constituents might trigger antagonistic action to decrease the oil's activity. Our study is the first on the chemical profile and phytotoxic effect of H. trionum EO.

中文翻译：

---

木槿精油的化学特征和植物毒性作用

研究了木槿精油 (EO) 的化学特征和植物毒性作用。通过 GC/MS 共鉴定出 17 种化合物，占整个油的 94.18%，其中植醇 (40.37%) 是主要成分。生物测定显示，5 mg/mL 的 EO 对苜蓿和反枝苋的根伸长分别抑制 32.66% 和 61.86%；同时，主要成分植醇也表现出显着的植物毒活性，在 1 mg/mL 的浓度下，狼尾草、苜蓿和 A. retroflexus 的自由基伸长率分别降低了 26.08%、27.55% 和 43.96%。EO 显示出比植醇弱的活性这一事实暗示某些成分可能会触发拮抗作用以降低油的活性。我们的研究是第一个关于 H. trionum EO 的化学特征和植物毒性作用的研究。