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植物研究 ›› 2007, Vol. 27 ›› Issue (4): 434-438.doi: 10.7525/j.issn.1673-5102.2007.04.012

• 论文 • 上一篇    下一篇

显脉金花茶的光合生理特性研究

韦 霄1,2;王满莲1;蒋运生1;唐 辉1;陈宗游1;曹洪麟2*   

  1. 1.广西壮族自治区中国科学院,广西植物研究所,桂林 541006 2.中国科学院华南植物园,广州 510650
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-07-20 发布日期:2007-07-20
  • 通讯作者: 曹洪麟
  • 基金资助:
     

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:
     

摘要: 采用LI-6400便携式光合测定系统(Li-Cor Inc., USA)对显脉金花茶光合特性进行研究。结果表明:(1)在夏季,显脉金花茶叶片的Pn日变化呈单峰曲线,最高峰出现在中午11:00。其最大净光合速率(Pmax)为3.81 μmol·m-2·s-1、光饱和点(LSP)为459.9 μmol·m-2·s-1、光补偿点(LCP)为6.9 μmol·m-2·s-1。显脉金花茶的光饱和点和光补偿点都比较低,表明其是一种阴生植物。(2)在控制光照强度和温度的条件下,CO2浓度小于800 μmol·mol-1Pn几乎呈直线上升,升高CO2浓度可使显脉金花茶的净高合速率增大,提高了叶片对光能的利用率。其叶片CO2饱和点(CSP)大约在1 200 μmol·mol-1左右,CO2的补偿点(Г*)为70.1 μmol·mol-1,最大羧化速率(Vcmax)为17.5 μmol·m-2·s-1,最大电子传递速率(Jmax)为40 μmol·m-2·s-1

关键词: 显脉金花茶, 净光合速率, 光饱合点, 光补偿点

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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