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KMID : 1098420190270010030
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Korean Journal of Medicinal Crop Science
2019 Volume.27 No. 1 p.30 ~ p.37
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Effects of Shading Treatments on Growth and Physiological Characteristics of Aruncus dioicus var. kamtschaticus (Maxim.) H. Hara Seedling
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Lee Kyeong-Cheol
Han Sang-Kyun
Kwon Young-Hyoo
Jeon Seong-Ryeol
Lee Chang-Woo
Seo Dong-Jin
Park Wan-Geun
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Abstract
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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·m2·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.
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KEYWORD
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Aruncus dioicus var. kamtschaticus, Chlorophyll Content, Chlorophyll Fluorescence, Performance Index, Photosynthetic Activity, Shading Treatment
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