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http://dx.doi.org/10.12791/KSBEC.2013.22.2.154

Physiological Responses of Bupleurum latissimum Nakai, Endangered Plants to Changes in Light Environment  

Lee, Kyeong-Cheol (Institute of Forest Science, Kangwon National University)
Wang, Myeong-Hyeon (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
Song, Jae Mo (Nature Environment Research Office of Gangwon Province)
Publication Information
Journal of Bio-Environment Control / v.22, no.2, 2013 , pp. 154-161 More about this Journal
Abstract
This study was conducted to investigate the physiological responses of Bupleurum latissimum, endangered plants by light condition. We investigated photosynthetic parameters, chlorophyll contents and chlorophyll fluorescence under different shading treatments (Shaded 50%, 70%, 90% and non-treated). Results showed that net apparent quantum yield (AQY) and chlorophyll contents were significantly increased with elevating shading level. However, light compensation point (LCP) and dark respiration ($R_d$) were shown the opposite trend. Especially, non-treated exhibited photoinhibition such as reduction of chlorophyll contents and maximum photosynthesis rate ($Pn_{max}$) also variation trend of stomatal conductance ($g_s$), and transpiration rate (E) were decreased to prevent water loss. Photosynthetic rate ($P_{Nmax}$) and photochemical efficiency (Fv/Fm) of 90% treatment showed a drastic reduction in July. This implies that photosynthetic activity will be sharply decreased with a long period of low light intensity. The 50% treatment showed relatively higher photosynthetic activity than other treated. This result suggested that growth and physiology of B. latissimum adapted to 50% of full sunlight.
Keywords
chlorophyll content; photosynthetic activity; photochemical efficiency; shading treatment;
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