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Bulletin of Botanical Research ›› 2007, Vol. 27 ›› Issue (4): 434-438.doi: 10.7525/j.issn.1673-5102.2007.04.012

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The Photosynthetic Characteristics of Camellia euphlebia

WEI Xiao;WANG Man-Liang;JIANG Yun-Sheng;TANG Hui;CHEN Zhong-You;CAO Hong-Lin*   

  1. 1.Guangxi Institute of Botany,Guangxi Zhuangzu Autonomous Region and the Chinese Academy of Sciences, Guilin 541006 2.South China Botanical Garden,the Chinese Academy of Sciences, Guangzhou 510650
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-07-20 Published:2007-07-20
  • Contact: CAO Hong-Lin
  • Supported by:

Abstract: The photosynthetic characteristics of leaves in Camellia euphlebia were studied with LI-6400 (Li-Cor Inc., USA) portable photosynthesis system. The results showed that the diurnal changes of photosynthetic rate (Pn) in C. euphlebia exhibited a mono-peak style, and the maximum value of Pn appeared at 11:00 am in summer. The maximum photosynthetic rate(Pmax), light saturation point(LSP), light compensation point(LCP)for the leaves of C. euphlebia were 3.81 μmol·m-2·s-1, 459.9 μmol·m-2·s-1 and 6.9 μmol·m-2·s-1, respectively. The light saturation and compensation point were very low, which indicated that C. euphlebia was a shade plant. Under the condition of optimum light intensity and temperature, the net photosynthetic rate of C. euphlebia increased linearly when the concentration of CO2 enhanced from 50 μmol·mol-1 to 800 μmol·mol-1. Elevation of CO2 concentration increased the Pn and the efficiency of ligh utilizing in C. euphlebia. The CO2 saturation (CSP), compensation point(Г*), the maximum carboxylation rate (Vcmax)and maximum rate of electron transport(Jmax) were about 1 200 μmol•mol-1, 70.1 μmol·mol-1, 17.5 μmol·m-2·s-1, respectively.

Key words: Camellia euphlebia, net photosynthetic rate, light saturation point, light compensation point

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