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Journal of Zhejiang University SCIENCE B 2009 Vol.10 No.10 P.784~790

10.1631/jzus.B0820348


Cyclic electron flow around photosystem I is required for adaptation to high temperature in a subtropical forest tree, Ficus concinna


Author(s):  Song-heng JIN, Xue-qin LI, Jun-yan HU, Jun-gang WANG

Affiliation(s):  School of Forestry and Biotechnology, Zhejiang Forestry University, Lin’ more

Corresponding email(s):   shjin@zjfc.edu.cn

Key Words:  Ficus concinna, High-temperature stress, Chlorophyll fluorescence, Photosynthesis, Cyclic electron transport around photosystem I, Dissipation of excitation energy


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Song-heng JIN, Xue-qin LI, Jun-yan HU, Jun-gang WANG. Cyclic electron flow around photosystem I is required for adaptation to high temperature in a subtropical forest tree, Ficus concinna[J]. Journal of Zhejiang University Science B, 2009, 10(10): 784~790.

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author="Song-heng JIN, Xue-qin LI, Jun-yan HU, Jun-gang WANG",
journal="Journal of Zhejiang University Science B",
volume="10",
number="10",
pages="784~790",
year="2009",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.B0820348"
}

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%T Cyclic electron flow around photosystem I is required for adaptation to high temperature in a subtropical forest tree, Ficus concinna
%A Song-heng JIN
%A Xue-qin LI
%A Jun-yan HU
%A Jun-gang WANG
%J Journal of Zhejiang University SCIENCE B
%V 10
%N 10
%P 784~790
%@ 1673-1581
%D 2009
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.B0820348

TY - JOUR
T1 - Cyclic electron flow around photosystem I is required for adaptation to high temperature in a subtropical forest tree, Ficus concinna
A1 - Song-heng JIN
A1 - Xue-qin LI
A1 - Jun-yan HU
A1 - Jun-gang WANG
J0 - Journal of Zhejiang University Science B
VL - 10
IS - 10
SP - 784
EP - 790
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Y1 - 2009
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.B0820348


Abstract: 
Dissipation mechanisms of excess photon energy under high-temperature stress were studied in a subtropical forest tree seedling, Ficus concinna. Net CO2 assimilation rate decreased to 16% of the control after 20 d high-temperature stress, and thus the absorption of photon energy exceeded the energy required for CO2 assimilation. The efficiency of excitation energy capture by open photosystem II (PSII) reaction centres (Fv′/Fm′) at moderate irradiance, photochemical quenching (qP), and the quantum yield of PSII electron transport (ΦPSII) were significantly lower after high-temperature stress. Nevertheless, non-photochemical quenching (qNP) and energy-dependent quenching (qE) were significantly higher under such conditions. The post-irradiation transient of chlorophyll (Chl) fluorescence significantly increased after the turnoff of the actinic light (AL), and this increase was considerably higher in the 39 °C-grown seedlings than in the 30 °C-grown ones. The increased post-irradiation fluorescence points to enhanced cyclic electron transport around PSI under high growth temperature conditions, thus helping to dissipate excess photon energy non-radiatively.

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