Abstract
This study intended to analyze growth changes and antioxidant activities of Romaine lettuce by different treatments of microbubble plasma discharge water and bioblock (far-infrared radiation). Hydroponics were performed in smart farm environments, and the used Romaine lettuce was the Caesar's Green variety. The treatment conditions of Romaine lettuce (TRL) are as follows: TRL-1 was treated with plasma discharge water and 30 bioblocks, and TRL-2 was treated with plasma discharge water and 40 bioblocks. On the other hand, TRL-3 was not treated. Romaine lettuce was grown for a total of 49 days and the growth changes were measured at every seven days. In growth changes, TRL-2 was significantly higher (p<0.05) than other treatments in germination rate and weight, leaf length, and leaf count. The total polyphenol and flavonoid contents were analyzed as similar levels between the samples, but TRL-2 showed higher antioxidant activities in ABTS radical scavenging (%) compared to the other samples. As a result of this study, TRL-2 conditions are evaluated to affect the growth and antioxidant functions of Romaine lettuce.
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