The methanol extracts of nine popular cultivated Vietnamese rice cultivars (Oryza sativa L.cv. OM 2395, 5451, 6976, 380, 5930, 4498, 3536, N406, and 7347) were used to explore their allelopathic potential on barnyardgrass (Echinochola crus-galli L.). At 0.1 g mL⁻¹, OM 5930, OM 4498, and OM 6976 correlatively possessed greatest phytotoxicity on barnyardgrass shoot (98.77%, 90.75%, and 87.17%) and root (99.39%, 92.83%, and 86.56%) growth. The following study aimed to detect previously-known allelochemicals in those rice using XCMS online cloud-based metabolomics platform. Twenty allelochemicals were semi-quantified and seven of them were detected predominantly and five was putatively confirmed in OM 5930 (mg/ 100g fresh rice) as salicylic acid (5.0076), vanillic acid (0.1246), p-coumaric acid (0.1590), 2,4-dimethoxybenzoic acid (0.1045), and cinnamic acid (3.3230). These compounds were active at concentrations greater than 0.5 mM and the average EC₅₀ were 1.24 mM. The results indicated that OM 5930 may use as promising candidates in weed biological control for rice production.

中文翻译：

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水稻的化感潜力和通过基于云的代谢组学平台鉴定已发表的化感物质。

使用九种流行的越南栽培稻品种（Oryza sativa L.cv.OM 2395、5451、6976、380、5930、4498、3536，N406和7347）的甲醇提取物探索bar在草上的化感作用（Echinochola crus-加里（ L. 在0.1 g mL ^-1时，OM 5930，OM 4498和OM 6976分别对bar草芽（98.77％，90.75％和87.17％）和根（99.39％，92.83％和86.56％）的生长具有最大的植物毒性。以下研究旨在使用XCMS在线基于云的代谢组学平台检测稻米中以前已知的化感物质。半定量了20种化感化学物质，其中OM 5930（mg / 100 g新鲜大米）中检出了7种，推定中确认了5种为水杨酸（5.0076），香草酸（0.1246），对香豆酸（0.1590），2 ，4-二甲氧基苯甲酸（0.1045）和肉桂酸（3.3230）。这些化合物在浓度大于0.5 mM和平均EC _50时具有活性为1.24毫米。结果表明，OM 5930可作为水稻生产中杂草生物防治的有前途的候选对象。