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| Characteristics of the Fast Chlorophyll Fluorescence Induction Kinetics of Heteromorphic Leaves in Populus euphratica |
| Liu Xiaoqing1, Chang Zongqiang1, Ma Yali1, Wu Yuxia2 |
1. Alxa Desert Ecohydrological Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Lanzhou 730000, China;
2. State Key Laboratory of Grassland Agro-ecosystems/School of Life College, Lanzhou University, Lanzhou 730000, China |
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Abstract Populus euphratica has two typical types of heterophylly (lanceolate and dentate broad-ovate) leaves. The characteristics of acclimation in photochemistry, thermal energy dissipation and electron transport in heteromorphic leaves of Populus euphratica Oliver in the Egina desert region were studied by measuring the fast chlorophyll fluorescence induction curves (OJIP). The results indicated that the dentate broad-ovate leaves had the higher maximum photochemical efficiency of photosystem Ⅱ (PSⅡ) (Fv/Fm), potential activity of PSⅡ (Fv/Fo), vitality indices (PI), active reaction centers per cross-section (RC /CSo), electron transport flux per cross-section (ETo/CSo), the fluxes ratios (ΦPo,Ψo,ΦEo). However, the initial slope of fluorescence intensity (M0), fluorescence intensity at the J step (Vj), energy fluxes per reaction center (ABS /RC, ETo/RC, TRo/RC, DIo/RC), maximum quantum yield of non-photochemical deexcitation (ΦDo) of the dentate broad-ovate leaves were lower than the lanceolate leaves. The results showed that the dentate broad-ovate leaves had the more effective energy allocation strategy, so it was more tolerant to the extreme stressful environment.
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Received: 12 December 2013
Published: 20 May 2014
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Corresponding Authors:
常宗强（Email：changzq@lzb.ac.cn）
E-mail: changzq@lzb.ac.cn
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2014, Vol. 34 
