园艺学报 ›› 2003, Vol. 30 ›› Issue (6): 647-652.

• 研究论文 • 上一篇    下一篇


张放; 陈丹; 张士良; 吴荣兰   

  1. (浙江大学园艺系,杭州310029)
  • 收稿日期:2003-01-06 修回日期:2003-03-25 出版日期:2003-12-25 发布日期:2003-12-25

Physiological Effects of Elevated CO2 on Loquat Trees (Eriobotrya japonica Lindl.)under Water Stress

Zhang Fang; Chen Dan; Zhang Shiliang; W u Ronglan

  1. (Department of Horticulture, Zhejiang University, Hangzhou 310029,China)
  • Received:2003-01-06 Revised:2003-03-25 Online:2003-12-25 Published:2003-12-25

摘要: 在近似大气的低CO2浓度(400 μmol·mol-1 )和高CO2浓度(700 μmol·mol-1)的两个自制的
开顶式生长室内,研究分析了水分胁迫对2年生‘大红袍’枇杷(Eriobotrya japonica Lindl.)叶片的光合作用、叶绿素荧光及抗氧化酶活性等生理变化。结果表明,高CO2浓度对不同水分状态下的枇杷叶片光合速率(Pn)均有明显的促进作用,使枇杷叶片荧光参数Fv/Fm和Fv/Fo值及PSII明显提高;而在水分胁迫时,高CO2浓度使枇杷叶片荧光参数Fv/Fm和Fv/Fo值及 II下降幅度明显减少;高CO2浓度也使SOD、POD及CAT酶活性显著提高,但在水分胁迫时,高CO2浓度下的SOD、POD及CA T酶活性上升幅度明显较小,膜脂过氧化水平的上升幅度也较小,可见CO2浓度升高对于水分胁迫所造成的氧化损伤有一定的缓解作用。

关键词: 枇杷, 高浓度CO2, 水分胁迫, 光合作用, 叶绿素荧光, 抗氧化酶

Abstract: Loquat trees(Eriobotrya japonica Lindl.)grown in two open-top growth chambers at CO2 concentrations of 400 μmol·mol-1 and 700 μmol·mol-1 were used to study the effects of elevated atmospheric CO2 ,concentration and water stress on photosynthesis.chlorophyll fluorescence and acting of an tioxidative enzymes in leaves.The results showed that elevated atmospheric CO2 concentration(700 μmol·mol-1) significantly enhanced the photosynthesis under various levels of water stress. Furthermore,under high CO2 condition, the values of Fv/Fm , Fv/Fo and PSⅡ were also higher than at normal atmospheric CO2 ,concentration,but the diference between the aterstressed
plants and well—watered plants was not significant. In addition, elevated atm ospheric CO2 concentration considerably jncreased the ach vities of SOD, POD an d CAT. Such jnerease, however, was farless significan t liBder water stress condition.The MDA content also showed less increase under the latter condition. The results indicate that high CO2 concentration seems to have ameliorating effect on drought—induced oxidative damage.

Key words: Loquat Trees, Elevated CO2, Water-stress, Photosynthesis, Chlorophyll fluorescence, Antioxidative enzyme