Journal of Northeast Forestry University. 2010, (06) Core

Effect of NaHCO3 Stress on Photosynthetic Characters and Fluorescence Parameters of Lonicera maackii Seedlings at Different Stress StagesChinese Full Text

Cui Qiang,Wang Qingcheng( Key Laboratory of Forest Tree Genetic Improvement and Biotechnology ( Northeast Forestry University) ,Ministry of Education,Harbin 150040,P. R. China) ; Liu Qiang( Jilin Normal University) ; Sun Jing,Xu Jing( Northeast Forestry University)

Abstract: A pot experiment was conducted for one-year-old Lonicera maackii seedlings to study the effect of NaHCO3 stress on photosynthetic characters and fluorescence parameters of L. maackii seedlings at different stress stages. Three treatment groups （ mild stress,moderate stress and severe stress; 180 total seedlings） and one control group （ without stress; 60 total seedlings） were established. Results showed that NaHCO3 stress decreased the net photosynthetic rate （ Pn） . Under the control and mild stress,long-time stress stage exhibited the highest Pn of L. maackii seedlings,followed by short-time and middle-time stress stages in order,while the chlorophyll fluorescence parameters changed a little at different stages. Under moderate stress,the Pn was the highest at short-time stress stage and the lowest at long-time stress stage,and the minimal fluorescence （ Fo） at short-time stress stage increased by 6. 8% ,and ratio of variable to maximum fluorescence （ Fv /Fm） decreased by 5. 8% ,while the Fo at long-time stress stage increased by 17. 1% ,and Fv /Fm decreased by 8. 5% . Under severe stress,the Pn at short-time stage was the highest,which was 124. 7% higher than that at long-time stress stage,and the water use efficiency of the former was about 1. 95 times as high as that of the latter; the Fo at short-time stage increased by 9. 9% ,and Fv /Fm decreased by 10. 2% ,while the Fo at long-time stage increased by 36. 2% ,and Fv /Fm decreased by 20. 1% . It is indicated that there is a close correlation between the stress stage and the effect of NaHCO3 stress on photosynthetic characters and chlorophyll fluorescence parameters.

Keywords：

NaHCO3 stress; Stress stage; Lonicera maackii; Photosynthesis; Chlorophyll fluorescence;

DOI：
10.13759/j.cnki.dlxb.2010.06.011
Series：
Subject：
Classification Code：
S567.79

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Effect of NaHCO3 Stress on Photosynthetic Characters and Fluorescence Parameters of Lonicera maackii Seedlings at Different Stress StagesChinese Full Text

Cui Qiang,Wang Qingcheng( Key Laboratory of Forest Tree Genetic Improvement and Biotechnology ( Northeast Forestry University) ,Ministry of Education,Harbin 150040,P. R. China) ; Liu Qiang( Jilin Normal University) ; Sun Jing,Xu Jing( Northeast Forestry University)

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