차광처리가 눈개승마 유묘의 생장 및 생리적 특성에 미치는 영향

이경철; 한상균; 권영휴; 전성렬; 이창우; 서동진; 박완근

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이경철 (국립한국농수산대학)
한상균 (국립한국농수산대학)
권영휴 (국립한국농수산대학)
전성렬 (한국산림복지진흥원)
이창우 (국립생태원)

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Background: This study was conducted to investigate the changes in the photosynthetic parameters, chlorophyll content, chlorophyll fluorescence, and growth characteristics of Aruncus dioicus var. kamtschaticus seedlings under different shading treatments.
Methods and Results: The shading treatment was regulated with the shading level (non-shaded, 35%, 55%, and 75% shading). Photosynthetic activities, such as net photosynthetic rate, stomatal conductance, stomatal transpiration rate, and performance index on absorption basis (PIABS)were the highest under 35% shading (4.36 μ㏖ CO₂·m⁻²·s⁻¹, 54.2 m㏖ H₂O·m^-2·s⁻¹, 0.66 m㏖ H₂O·m⁻²·s⁻¹, and 1.3, respectively), and the lowest under 75% shading. This implies that the decrease in net photosynthetic rate may be due to an inability to regulate water and CO2 exchanged through the stomata. Thechlorophylla, b, and a + b contents were increased with elevating shading level and the chlorophyll a/b ratio showed non-significant differences. It was found that the dry weight (leaf, shoot, and whole) was the highest (1.14 g, 0.49 g, and 2.31 g, respectively) under 35% shading and the t/R ratio was the highest under 75% shading.
Conclusions: It is concluded that 75% shading exhibited a strong reduction of photosynthetic activity, and 35% shading showed the best conditions for the early growth and cultivation of A. dioicus var. kamtschaticus.

#Aruncus dioicus var. kamtschaticus #Chlorophyll Content #Chlorophyll Fluorescence #Performance Index #Photosynthetic Activity #Shading Treatment