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KMID : 1098420070150030152
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Korean Journal of Medicinal Crop Science
2007 Volume.15 No. 3 p.152 ~ p.156
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Effects of Shading Treatments on Photosynthetic rate and Growth in Codonopsis lanceloata Trautv.
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Lee Chung-Yeol
Won Jun-Yeon
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Abstract
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The Condonopsis lanceolata Trautv. was planted in field to investigate the effect of afterwards shading in the condition of sun light of fifty six percent on the characteristics of photosynthesis according to leaf position at flowering stage. The vine length and leaf area were increased with shading treatment in comparison with that of non-shading. Dry weight of leaf and vine indicate opposite tendency with the result above. SLA (specific leaf area) was much more increased in shaded leaves than that obtained from non-shading treatment. The shaded leaves of plant show a higher SPAD value than that of non-shaded leaves. The net photosynthetic rate and stomatal conductance were increased as the PAR was increased. And it is the maximum valve (PAR of 700-1000 {mu}mol/m^2/s of PAR) of all leaves. Overnurse and light saturation point of the Condonopsis lanceolata Trautv. shading-treated was improved in comparison with control as net photosynthetic rates of leaves positioned on each part of the stem was increased.
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KEYWORD
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Codonopsis lanceolata Trautv, growth, leaf position, light intensity, photosynthesis, shading treaaent, SPAD, stomatal conductance
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