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Leonardo Lombardini, Astrid Volder, Monte L. Nesbitt, and Donita L. Cartmill

al., 1994 ). Because ROS are damaging to membrane integrity, a small upregulation of ROS production may also affect membrane functioning of the non-injured cells leading to a reduced efficiency of PSII in these cells. When the reduction in PSII

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Jiaxin Li, Yingli Ma, and Yinfeng Xie

fluores cence parameters. All chlorophyll fluorescence parameters, including the maximal efficiency of PSII photochemistry ( F v / F m ), the effective efficiency of PSII photochemistry ( F v '/ F m '), actual PSII efficiency (Φ PSII ), photochemical

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Rajeev Arora and Lisa J. Rowland

is the avoidance of high light stress in the winter by reducing leaf exposure to light ( Bao and Nilsen, 1988 ) and thereby facilitating relatively faster recovery of PSII efficiency in spring ( Russell et al., 2009 ) . Lack of thermonastic behavior

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Juan Carlos Díaz-Pérez, Kelly St. John, Mohammad Yamin Kabir, J. Alberto Alvarado-Chávez, Ania M. Cutiño-Jiménez, Jesús Bautista, Gunawati Gunawan, and Savithri U. Nambeesan

leaf net photosynthesis with increasing leaf temperature was probably caused by stomatal factors due to plant water stress rather than by nonstomatal factors, such as photo-inhibition; this suggestion is supported by the similar PSII efficiency values

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Ryan N. Contreras, John M. Ruter, James S. Owen Jr., and Andy Hoegh

.) from winter stress ( Ottander and Öquist, 1991 ). In Winter 2007–08, chlorophyll fluorescence was measured as an estimate of photosystem II (PSII) efficiency to assess damage. However, the values collected were extremely inconsistent (data not shown

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Sorkel Kadir, Michael Von Weihe, and Kassim Al-Khatib

less severe for both cultivars. There was a 24% decline in ‘Vignoles’ compared with a 61% decline in ‘Cynthiana’ leaves. Decline in PSII efficiency in both cultivars might be attributed to several factors, including damage to oxygen-evolving apparatus

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Ritu Dhir, Richard L. Harkess, and Guihong Bi

result of a reduction in photosystem II (PSII) efficiency ( Kadir et al., 2006 ). Photosynthetic response to high temperatures can vary significantly within a species ( Reynolds et al., 1990 ). Net photosynthesis of pea ( Pisum sativum ) plants decreased

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Qin Shi, Yunlong Yin, Zhiquan Wang, Wencai Fan, and Jianfeng Hua

pulses to measure the maximum fluorescence yield in the light-adapted period ( F ′ m ). Actual PSII efficiency (φPSII) was then determined as ( F ′ m − F s )/ F ′ m , where F s was steady-state fluorescence. NPQ was derived from ( F m − F ′ m )/ F

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Shasha Wu, Youping Sun, and Genhua Niu

chlorophyll fluorescence of the nine species (data not shown), indicating that neither PSII efficiency nor photosynthetic apparatus were affected by salinity. Mineral analysis. Compared with control, shoot Na concentration of butterfly blue, mexican

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Pradeep Kumar, Menahem Edelstein, Mariateresa Cardarelli, Emanuela Ferri, and Giuseppe Colla

*, a*, and b* system ( Fanasca et al., 2006 ). Chlorophyll fluorescence measurements. The Photosystem II (PSII) efficiency of leaves, estimated by the variable to maximum chlorophyll fluorescence ratio (F v /F m ) was measured by chlorophyll fluorometer