This study was undertaken to determine the influence of salicylic acid (SA) on the bioactive phytochemicals and antioxidant capacity of wheatgrass extract in the organic growing medium. Wheatgrass was cultivated in SA‐enriched organic growing medium, obtained from acetylsalicylic acid (aspirin) of various concentrations (0 [control], 0.25, 0.50, 1.00, and 2.00 mM) in a plant growth chamber by controlling atmosphere (20/15 °C, day/night), light (14/10 h, light/dark; light intensity 150 μmol m⁻² s⁻¹, using quantum dot light‐emitting diodes), and atmospheric moisture (60 %) for 10 d. The 0.25 mM SA‐treatment showed the highest impact on germination rate, wheatgrass length, weight, yield, and chlorophyll content. Levels of bioactive phytochemicals, mainly phenolic compounds, flavonoids, β‐carotene, and vitamin C, were the highest in the 1.00 mM SA‐treated wheatgrass extract. The DPPH radical and nitrite‐scavenging capacities were the highest in the 1.00 mM SA‐treated wheatgrass extract. The 0.50 mM SA‐treated wheatgrass extract showed the highest superoxide dismutase‐like capacity, whereas the 2.00 mM SA‐treated wheatgrass extract showed the highest anthocyanin content and ABTS radical‐scavenging capacity. Therefore, it might be suggested that the appropriate levels of SA‐treatment were between 0.5 and 1.0 mM to enhance the bioactive phytochemicals and antioxidant capacity of wheatgrass.

中文翻译：

---

水杨酸处理有机土壤对小麦草的生物活性植物化学物质和抗氧化能力的影响

进行这项研究以确定水杨酸（SA）对有机生长培养基中小麦草提取物的生物活性植物化学物质和抗氧化能力的影响。小麦草是在富含SA的有机生长培养基中种植的，该培养基是通过控制气氛（20/15°）在植物生长室内从各种浓度（0 [对照]，0.25、0.50、1.00和2.00 mM的乙酰水杨酸（阿司匹林）获得的） C，日/夜），亮（14/10 h，亮/暗;光强度150μmolm ^-2  s ^-1，使用量子点发光二极管）和大气湿度（60％）达10天。0.25 mM SA处理对发芽率，小麦草长度，重量，产量和叶绿素含量影响最大。在1.00 mM SA处理的小麦草提取物中，生物活性植物化学物质的水平最高，主要是酚类化合物，类黄酮，β-胡萝卜素和维生素C。在1.00 mM SA处理的小麦草提取物中，DPPH自由基和亚硝酸盐清除能力最高。经SA处理的0.50 mM小麦草提取物显示出最高的超氧化物歧化酶样能力，而经SA处理的2.00 mM小麦草提取物显示出最高的花色苷含量和ABTS自由基清除能力。因此，可能建议SA处理的适当水平在0.5到1之间。