ABSTRACT Tropospheric ozone is an important ambient atmospheric pollutant component in urban areas. Determining plant reactions to ozone in plant growth and biochemical quality contents plays an important role in understanding plant metabolism. This study aimed to provide an understanding of the effect of ozone on early vegetative growth stage Pak-Choi (Brassica campestris L. ssp. chinensis). An experiment was conducted within an airtight bio-chamber for six consecutive days under 60 ppb ozone concentration. Different exposure duration conditions were 0 h/day, 1 h/day, and 4 h/day. The results showed no reaction of plant growth, but ozone exposure led to significant impacts in biochemical quality. The content of photopigments was not significantly impacted at 1 h/day, but significantly increased at the 4 h/day exposure condition. There was a significant decrease in the total glucosinolate (GLS) and total aliphatic GLS after the 4 h/day exposure condition; however, 4-Methylthiobutyl-GLS, total indole, and aromatic GLS were significantly increased. It appears that biochemical systems are more sensitive than the systems controlling plant growth, and this needs to be taken into account when implementing urban production sites for vegetables.

中文翻译：

---

中度臭氧暴露时间不同对芸苔属植物次生代谢物的影响。中华

摘要 对流层臭氧是城市地区重要的环境大气污染物成分。确定植物对臭氧在植物生长和生化质量含量中的反应对于了解植物代谢具有重要作用。本研究旨在了解臭氧对早期营养生长阶段 Pak-Choi (Brassica campestris L. ssp. chinensis) 的影响。在 60 ppb 臭氧浓度下连续六天在密闭生物室中进行实验。不同的暴露持续时间条件为 0 小时/天、1 小时/天和 4 小时/天。结果表明植物生长没有反应，但臭氧暴露对生化质量产生显着影响。感光色素的含量在 1 小时/天时没有显着影响，但在 4 小时/天曝光条件下显着增加。在 4 小时/天的暴露条件后，总硫代葡萄糖苷 (GLS) 和总脂肪族 GLS 显着降低；然而，4-甲基硫代丁基-GLS、总吲哚和芳香GLS显着增加。生化系统似乎比控制植物生长的系统更敏感，在实施城市蔬菜生产基地时需要考虑到这一点。