Abstract

Eleocharis atropurpurea is an annual weed and distributed widely in pantropical and subtropical regions. Yet, there have been no studies on the allelopathy of E. atropurpurea. Therefore, we investigated the allelopathic potential of E. atropurpurea to identify allelopathic substances from it. The aqueous methanolic extracts of E. atropurpurea showed an inhibitory effect on the seedling growth of lettuce, rapeseed, barnyard grass and foxtail fescue. Inhibition was species- and concentration-dependent. Two substances, syringaldehyde and acetosyringone, were isolated by using chromatography and using spectroscopy their structures were determined. Syringaldehyde and acetosyringone inhibited the shoot and root growth of cress and barnyard grass at concentrations greater than 3.0 mM except shoot growth of barnyard grass by acetosyringone. Concentration and seedling growth of cress and barnyard grass displayed a negative correlation. The I₅₀ values of syringaldehyde and acetosyringone for the shoot and root growth of cress were 1.67 and 1.61 mM, and 1.49, and 1.29 mM, respectively, whereas for the shoot and root growth of barnyard grass the values were 4.09 and 2.41 mM, and 4.54 and 1.92 mM, respectively. Therefore, it is suggested that these compounds may contribute to the inhibitory effects of E. atropurpurea.

摘要

Eleocharis atropurpurea是一年生杂草，广泛分布于泛热带和亚热带地区。然而，尚未有关于金黄色葡萄球菌的化感作用的研究。因此，我们调查了大肠埃希氏菌的化感潜力，以从中鉴定化感物质。大肠埃希氏菌的甲醇水溶液提取物对生菜，油菜籽，n草和狐尾羊茅的幼苗生长具有抑制作用。抑制作用是物种和浓度依赖性的。使用色谱法分离并分离了丁香醛和乙酰丁香酮这两种物质，并确定了其结构。丁二醛和乙酰丁香酮在浓度大于3.0 mM时抑制水芹和bar草的芽和根生长，除了乙酰丁香酮使bar草的芽生长。水芹和n草的浓度与幼苗生长呈负相关。我₅₀丁香醛和乙酰丁香酮的水芹芽和根生长值分别为1.67和1.61 mM，1.49和1.29 mM，而bar草的芽和根生长值分别为4.09和2.41 mM，4.54和1.92毫米。因此，建议这些化合物可能对金黄色葡萄球菌的抑制作用有贡献。