Changes of Characteristics Related to Photosynthesis in Synurus deltoides under Different Shading Treatments
2012
Lee, K.C., Kangwon National University, Chuncheon, Republic of Korea | Noh, H.S., Specialty Crops Experiment Station, Gangwon Agricultural Research and Extension Services, Pyeongchang, Republic of Korea | Kim, J.W., Specialty Crops Experiment Station, Gangwon Agricultural Research and Extension Services, Pyeongchang, Republic of Korea | Ahn, S.Y., Gangwon-do Agricultural Research and Extension Services, Chuncheon, Republic of Korea | Han, S.S., Kangwon National University, Chuncheon, Republic of Korea
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 (L∧comp), dark respiration (D∧resp), maximum photosynthesis rate (Pn∧max), photo respiration rate (P∧resp), carboxylation efficiency (CO₂∧comp), and photochemical efficiency were decreased with increasing shading level; However, compensation point (), 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 (Pn∧max), 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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