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KMID : 1098420120200050320
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Korean Journal of Medicinal Crop Science
2012 Volume.20 No. 5 p.320 ~ p.330
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Changes of Characteristics Related to Photosynthesis in Synurus deltoides under Different Shading Treatments
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Lee Kyeong-Cheol
Noh Hee-Sun
Kim Jong-Hwan
Ahn Soo-Young
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Abstract
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This study was conducted to investigate the changes of chlorophyll contents, chlorophyll fluorescence, photosynthetic parameters, and leaf growth of Synurus deltoides under different shading treatments. S. deltoides was grown under non-treated (full sunlight) and three different shading conditions (Shaded 88~93%, 65~75%, and 45%~55%). Light compensation
point (Lcomp), dark respiration (Dresp), maximum photosynthesis rate (Pnmax), photo respiration rate (Presp), carboxylation efficiency (Φcarb), and photochemical efficiency were decreased with increasing shading level; However, CO2 compensation point (CO2 comp), total chlorophyll content, and specific leaf area (SLA) were shown the opposite trend. S. deltoides under 88~93% treatment showed the lowest photosynthetic activity such as maximum photosynthetic rate (Pnmax), photochemical efficiency, and CO2 compensation point (CO2 comp). Therefore, photosynthetic activity will be sharply decreased with a long period of 8~12% of full sunlight. With the shading level decreased, carotenoid content and non-photochemical fluorescence quenching (NPQ) increased to prevent excessive light damage. This result suggested that growth and physiology of S. deltoides adapted to high light intensity through regulating its internal mechanism.
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KEYWORD
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Photosynthetic Activity, Carboxylation Efficiency, Chlorophyll Content, Synurus deltoides, Non-Photochemical Fluorescence Quenching (NPQ)
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