摘要
采用LI-6400便携式光合测定系统(Li-CorInc.,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3.81μmol·m-2.s-1、光饱和点(LSP)为459.9μmol·m-2·s-1、光补偿点(LCP)为6.9μmol·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800μmol·mol-1,Pn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1200μmol·mol-1左右,CO2的补偿点(Г*)为70.1μmol·mol-1,最大羧化速率(Vcmax)为17.5μmol·m-2·s-1,最大电子传递速率(Jmax)为40μmol·m-2·s-1。
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 Camellia 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 P. and the efficiency of ligh utilizing in Camellia euphlebia. The CO2 saturation （ CSP）, compensation point（ Г^＊）, the maximum carboxylation rate （ Vcmax ） and maximum rate of elec- tron transport（Jmax） were about 1 200μmol·mol^-1, 70. 1 μmol·mol^-1, 17.5 μmol·m^-2·s^-1 , respectively.
出处
《植物研究》
CAS
CSCD
北大核心
2007年第4期434-438,共5页
Bulletin of Botanical Research
基金
国家自然科学基金(编号:30560015)
广西自然科学基金(桂科基0575115)
广西区攻关(桂科技攻0718002-3-7)项目资助
关键词
显脉金花茶
净光合速率
光饱合点
光补偿点
Camellia euphlebia
net photosynthetic rate
light saturation point
light compensation point
