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应用生态学报 ›› 2003, Vol. ›› Issue (6): 867-870.

• 研究论文 • 上一篇    下一篇

高温胁迫对柑橘光合速率和光系统Ⅱ活性的影响

郭延平, 周慧芬, 曾光辉, 张良诚   

  1. 浙江大学园艺系, 杭州 310029
  • 收稿日期:2002-03-29 修回日期:2002-09-23 出版日期:2003-06-15
  • 通讯作者: 郭延平,男,1963年生,博士后,副教授,主要从事果树生理与环境生物学研究,发表论文30余篇.E-mail:ypguo@zju.edu.cn.
  • 基金资助:
    国家自然科学基金项目(39970525);浙江省自然科学基金资助项目(399470)

Effects of high temperature stress on net photosynthetic rate and photosystem Ⅱ activity in Citrus

GUO Yanping, ZHOU Huifen, ZENG Guanghui, ZHANG Liangcheng   

  1. Department of Horticulture, Zhejiang University, Hangzhou 310029, China
  • Received:2002-03-29 Revised:2002-09-23 Online:2003-06-15

摘要: 用红外CO2分析仪和叶绿素荧光仪测定了温州蜜柑和脐橙叶片的净光合速率(Pn)、初始荧光(Fo)、最大光能转换效率(Fv/Fm)及电子传递速率(ETR).结果表明,与常温(25℃)相比,高温胁迫(38~40℃)使温州蜜柑和脐橙叶片的Pn、Fv/FmETR下降,Fo升高.胁迫25d后温州蜜柑和脐橙叶片的Pn分别下降55.6%和39.8%,Fv/Fm下降22.0%和6.7%,ETR下降55.0%和41.5%,Fo分别上升了113.8%和14.9%.柑橘经高温胁迫后,在25℃下处理10d,叶片的PnFv/FmFoETR恢复明显.这些结果说明柑橘的光合速率下降与PSⅡ反应中心失活有关.

Abstract: Table ADC-225-MK3 CO2 gas analyzer and PAM 2000 portable fluorescence measurement system were used to measure the net photosynthetic rate (Pn), initial fluorescence (Fo), maximal photochemical efficiency of PSⅡ (Fv/Fm) and electron transport rate (ETR) of satsuma mandarin (Citrus unshiu Marc.) and navel orange (C. sinensis Osbeck) leaves. The results showed that exposure of citrus plants to high temperature (38~40 ℃) led to a lowering of Pn, Fv/Fm, and ETR, whereas Fo increased. After exposure to high temperature for 25 days, compared with normal temperature (25 ℃),the Pn of satsuma mandarin and navel orange leaves decreased by 55.6% and 39.8%, Fv/Fm decreased by 22.0% and 6.7% and ETR reduced by 55.0% and 41.5 %, respectively. On the other hand, Fo increased 113.8% and 14.9%,respectively. With subsequent transfer to the 25 ℃ culture room for 10 days, Pn, Fv/Fm, Fo and ETR recovered significantly. These results demonstrated that the reduction of Pn in Citrus was related to the inactivation of PSⅡ reaction center.

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