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Diurnal changes in photosynthetic characteristics of two differently shaped leaves in the desert plant Populus euphratica

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We studied the diurnal photosynthetic changes of Populus euphratica, a tree with distinct leaf shape polymorphism, in a typical desert environment. The photosynthetic CO2 assimilation rate in lanceolate leaves (LL), located at the bottom of the tree's canopy, is dependent on the diurnal changes in irradiation and reaches a maximum at 13:00 h, while a severe midday depression was observed in broad-ovate leaves (BOL) at the top of the tree's canopy at 13:00 h, most probably due to high temperature, irradiance, and water deficit. Though non-photochemical quenching increased dramatically at 13:00 h in BOL, the photosystem II (PS II) photochemical efficiency decreased. Western blot analysis showed that both PS II reaction center D1 protein and light harvesting complex II (LHC II) protein decreased when the midday depression occurred in BOL, which suggests that the decreased PS II proteins may account for the photosynthetic depression. Together with the low stomatal conductance observed, when this occurs, both stomatal and non-stomatal factors contribute to the midday depression in BOL. The physiological significance of leaf polymorphism is also discussed.

Affiliations: 1: Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences zhanglx@ns.lzb.ac.cn ; 2: School of Life Science, State Key Laboratory of Arid Agroecology, Lanzhou University ; 3: Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences ; 4: Department of Biology and Chemistry, Central University for Nationality ; 5: School of Life Science, State Key Laboratory of Arid Agroecology, Lanzhou University biyurong@hotmail.com

10.1560/MRB6-VV99-6DP9-Q4YA
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2003-05-13
2018-09-26

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