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Seasonal characteristics of chlorophyll fluorescence kinetics of heteromorphic leaves in Populus Euphratica
Received:April 05, 2017  Revised:January 04, 2018  Click here to download the full text
Citation of this paper:ZongQiang Chang,Hua Tao,Qiang Zhu,2018.Seasonal characteristics of chlorophyll fluorescence kinetics of heteromorphic leaves in Populus Euphratica.Sciences in Cold and Arid Regions,10(2):169~179.
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Author NameAffiliationE-mail
ZongQiang Chang Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China changzq@lzb.ac.cn 
Hua Tao Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
Qiang Zhu Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
基金项目:This work was supported by the Program for National Natural Science Foundation of China (31370396), and the Program for China Terrestrial Ecosystem Research Network (2017-LYPT-006).
 
Abstract:Populus euphratica Oliver grown in desert areas have polymorphic leaves, which include lanceolate to serrate oval leaves. This paper measures the chlorophyll fluorescence-induction kinetics curves of two types of heteromorphic leaves (lanceolate and serrate oval) of P. euphratica over the growth season in the Ejina Desert area, China. This is in order to study the electron transport, as well as absoprtion, distribtution, and dissipation of light energy and their adaptation characteristics. The results indicate that (1) serrate oval leaves' photosystem II (PSII) initial light-energy-conversion efficiency (Fv/Fm), potential activity (Fv/F0), and the light-energy-utilization parameter (PI) are higher than those of lanceolate leaves; the accumulated amount of QA-(Vj) and the relative speed of QA deoxidation (M0) are lower than those of lanceolate leaves; (2) the reaction center density (RC/CS0) and electron-transfer energy (ET0/CS0) in the unit cross-sectional area of serrate oval leaves are higher than those of lanceolate leaves; the energy consumed in unit cross-sectional area (DI0/CS0), and energy-flow parameters (ABS/RC, ET0/RC, TR0/RC, and DI0/RC) in the unit reaction center of serrate oval leaves are lower than those of lanceolate leaves; (3) the proportion of energy used for photochemical reaction and energy electron transport in serrate oval leaves (ΦP0, Ψ0, and ΦE0) are larger than those in lanceolate leaves, and the maximum quantum yield (ΦD0) of nonphotochemical reaction is less than that of lanceolate leaves. Thus, serrate oval leaves of P. euphratica have a more efficient energy-distribution strategy and better adaptability to extreme environmental conditions than lanceolate leaves.
keywords:chlorophyll fluorescence-induction kinetics|seasonal changes|Populus euphratica Oliver|lanceolate leaves|oval leaves
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