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KMID : 1098420070150040276
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Korean Journal of Medicinal Crop Science
2007 Volume.15 No. 4 p.276 ~ p.284
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Characteristics of Photosynthesis with Growing Stages by different Shading Materials in Panax Ginseng C. A. Meyer
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Lee Chung-Yeol
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Abstract
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To investigate the influence of shading materials with growing stages in Panax Ginseng C. A. Meyer, the diurnal change of photosynthesis, stomatal conductance, transpiration and its any correlation were measured. The net photosynthetic rate and stomatal conductance of ginseng were higher in the morning than in the broad day. The net photosynthetic rate was increased as the PAR (Photosynthetically Action Radiation) was increased and it was reached the maximum at the of PAR in overall leaves. Transpiration rate was increased in the afternoon compared to in the morning. The transpiration rate was higher in rain shelter shading plate than in polyethylene net. A linear equation was obtained between net photosynthetic rate and stomatal conductance in the morning. SPAD was higher in rain shelter shading plate than in polyethylene net through all growth stages. It may result from the decrease of growth progress. From investigating photosynthetic characteristics, we concluded that shading plate of rain shelter was more an efficient material to ginseng growth.
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KEYWORD
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panax ginseng, PAR, photosynthesis, shading material, stomal conductance, SPAD, transpiration
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