Abstract: Coronatine (COR) is a novel multifunctional plant growth regulator. In order to observe the stability of COR in aqueous solution and provide guidance for its production, storage and usage, this study measured the content of coronatine under various treatments by HPLC, and explored the effects of temperature, pH, light and oxidizing agent on the stability of coronatine. The results showed that under 25℃ and 50℃ and in 3 kinds of buffered solutions with pH 4.01, 6.86 and 9.18 for 180 d, the coronatine degradation rate was less than 16%. The half-life of being hydrolyzed was all over 1 year, and it was not easy to be hydrolyzed. High temperature could significantly stimulate COR hydrolyzation under extreme pH environment, especially in strong alkali condition. No significant hydrolysis was observed within 180 d under fluorescent lamp irradiation. The half-life of COR was only 61.9 h under UV light, which indicated that COR was sensitive to UV and stable to visible light. In the presence of H2O2, COR hydrolyzation was significantly speed up. With the treatment of H2O2 for 12 h at room temperature and 70℃, COR degraded 75% and 81%, respectively. The results suggested that COR was stable to temperature, pH and visible light, but sensitive to UV and oxidizing agent. It should be kept away from the agricultural chemicals with strong oxidation function during operation and storage.

Key words: coronatine, degradation, pH, temperature, light, oxidizing agent

摘要： 冠菌素是一种新型多功能的植物生长剂。旨在考察冠菌素在水溶液中的稳定性，为其生产、贮存、应用提供指导。采用HPLC测定各处理冠菌素的含量，探究温度、pH、光照和氧化剂对冠菌素稳定性的影响。结果表明，温度25℃和50℃，冠菌素在pH 为4.01、6.86和9.18三种缓冲溶液中180 d降解不到16%，水解半衰期均大于一年，不易水解；高温能显著促进极端pH环境冠菌素的水解，尤其是强碱环境，70℃ 0.1 mol/L NaOH处理12 h后冠菌素仅剩下18%；日光灯照射180 d冠菌素未见显著的降解，紫外光下冠菌素的半衰期仅为61.9 h，说明冠菌素对可见光稳定，对紫外敏感；氧化剂H2O2存在时，冠菌素的降解显著加快，室温和70℃ H2O2处理12 h后冠菌素分别降解了75%和81%。冠菌素对温度、pH、可见光都具有良好的稳定性，对紫外、氧化剂敏感，不宜与具有强氧化性的农用化学品一起存放或使用。

关键词: 冠菌素, 降解, pH, 温度, 光, 氧化剂