도라지 공정 육묘를 위한 폐쇄형 식물 생산 시스템 내 최적 광도와 광주기

초록

Platycodon grandiflorum is a medicinal plant primarily cultivated in Korea, China, and Japan. The roots of Platycodon grandiflorum are high in saponins. This making them effective for protecting the respiratory system, which is why they are extensively used as medicinal materials, as well as in processed food and cosmetics. However, a proper lighting environment for the large-scale production of Platycodon grandiflorum in a closed-type plant production system (CPPS) has not been established. Therefore, this study was conducted to elucidate the optimal light intensity and photoperiod for Platycodon grandiflorum. The seedlings were cultivated in a walk-in chamber at 24.9 ± 0.9°C temperature and 53.7 ± 10.9% relative humidity for 48 days. Light intensities of 100, 150, and 200 ± 10 μmol·m-2·s-1 were used, along with photoperiods of 10/14, 12/12, and 14/10 h (light/dark). The highest growth of the shoot was observed at the highest light intensity of 200 μmol·m-2·s-1, showing no significant differences between the photoperiods of 12/12 and 14/10 h. In 200 μmol·m-2·s-1, the internode length at photoperiod of 12/12 h was significantly shorter compared to the photoperiod of 14/10 h. In 200 μmol·m-2·s-1, the root characteristics showed enhanced growth at photoperiod of 14/10 h compared to photoperiod of 12/12 h. In conclusion, a light environment of 200 μmol·m-2·s-1 with a photoperiod of 12/12 h is deemed suitable for the plug seedling production for seedling of Platycodon grandiflorum.

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