고농도 CO2 조건에서 참당귀 플러그 묘의 생육, 광합성 색소 및 육묘기간 평가

초록

This study aimed to evaluate the shoot and root growth, changes in photosynthetic pigments, and nursery period of Korean angelica plug seedlings under different CO2 concentrations in plant factories with artificial lighting systems (PFALs). Korean angelica seeds were sown in 72-cell plug trays, and the seedlings were grown for 40, 50, and 60 days to evaluate their morphological characteristics and chlorophyll contents. The internal CO2 concentrations in PFALs were set at three levels: ambient (475 ± 40 μmol·mol-1), ‘high concentration’ (‘HC’, 758 ± 29 μmol·mol-1), and ‘very high concentration’ (‘VHC’, 1,197 ± 37 μmol·mol-1). CO2 supply started 20 days after sowing when cotyledons were fully extended, and the first true leaf was observed. As a result, from 50 days after sowing, the crown diameter, leaf area, root development, and dry weight were higher in HC and VHC than in ambient, indicating a faster growth speed. However, there was statistically no significant difference in the dry matter accumulation between HC and VHC. From a morphological point, VHC had the longest petioles and the widest leaf area at 60 days after sowing, and the canopy expanded horizontally. The chlorophyll a, b, and total chlorophyll content were also the lowest. Additionally, the leaf area index was higher compared to the ambient, and the specific leaf weight, which indicates leaf thickness, was reduced. This is thought to be because the growth speed is fast, resulting in competition between individuals within the narrow plug tray environment. Therefore, the appropriate CO2 concentration for shortening the nursery period of Korean angelica is considered to be approximately 800 μmol·mol-1 and the appropriate nursery period in 800 μmol·mol-1 condition is 50 days.

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