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Chenping Xu and Beiquan Mou

; Konica Minolta Sensing, Tokyo, Japan). Leaf maximum photochemical efficiency (F v /F m ), photochemical yield [Y(II)] and electron transport rate (ETR) were measured with a fluorometer (MINI-PAM-II; Heinz Walz, Effeltrich, Germany) on the four largest

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

changes in photochemical efficiency and heat dissipation; low Fv/Fm values in plants under stress indicate damage to the PSII reaction center. Chlorophyll fluorescence is used to determine the effects of environmental stresses on photosynthesis in plants

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Zhongjie Ji, James J. Camberato, Cankui Zhang, and Yiwei Jiang

). GABA is a nonprotein amino acid that is well recognized as an endogenous plant signaling molecule ( Kinnersley and Turano, 2000 ). Exogenous application of GABA enhanced photosynthesis, leaf photochemical efficiency, and enzymatic antioxidant activity

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Marjorie Reyes-Diaz, Miren Alberdi, and Maria de la Luz Mora

parameters. Chlorophyll fluorescence parameters were used to determine the photochemical efficiency of PSII in leaves. The basic protocol of Reyes-Díaz et al. (2005) was followed. Fluorescence of attached nonshaded leaves was measured using a portable

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Julián Miralles-Crespo, Juan Antonio Martínez-López, José Antonio Franco-Leemhuis, and Sebastián Bañón-Arias

energy transfer efficiency to PSII, either by diverting energy from PSII to PSI through state transitions or by dissipating excess energy as heat through non-photochemical quenching. On a longer time scale, photosynthetic acclimation to high PSII

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Geoffrey Weaver and Marc W. van Iersel

photochemical efficiency. Combined with PPFD , Φ PSII is used to calculate the rate of linear electron transport through PSII (the ETR), an estimate of the overall rate of the light reactions of photosynthesis ( Baker and Rosenqvist, 2004 ; Genty et al., 1989

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Marjorie Reyes-Díaz, Claudio Inostroza-Blancheteau, Rayen Millaleo, Edgardo Cruces, Cristián Wulff-Zottele, Miren Alberdi, and María de la Luz Mora

) physiological and biochemical responses in highbush blueberry cultivars subjected to acid Al toxicity. They found that the photochemical efficiency of PSII was least affected in the most Al-tolerant cultivar. Nevertheless, the long-term effect of Al toxicity has

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Jia Li, Liyun Liu, Huanqi Zhou, and Meng Li

-control software (PAMWin 3.0). The photochemical quenching (qP) = (F m – F s )/(F m ′ – F o ′), nonphotochemical quenching (NPQ) = (F m – F m ′)/F m ′, maximum photochemical efficiency of PSII (F v /F m , F v = F m – F o ), and actual photochemical efficiency

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Jieshan Cheng, Peige Fan, Zhenchang Liang, Yanqiu Wang, Ning Niu, Weidong Li, and Shaohua Li

bag removal” treatment at 1100 hr and 1000 to 1100 hr , respectively ( Fig. 2, E and F ). Fig. 2. Diurnal changes in ( A ) maximal quantum yield of photosystem II (F v /F m ), ( B ) actual photochemical efficiency of photosystem II (ΦPSII

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Eric Watkins, Bingru Huang, and William A. Meyer

related to rainfall differences, although it will not grow in arid regions with severe drought ( Davy, 1980 ). When compared with tall fescue, tufted hairgrass seedlings were shown to have lower photochemical efficiency at high temperatures ( Steiner et al