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Guoting Liang, Junhui Liu, Jingmin Zhang, and Jing Guo

coefficient: q P = ( F M ' – F S )/( F M ' – F 0 '); nonphotochemical quenching: NPQ = ( F M – F M ')/ F M '; and effective quantum yield of PSII photochemistry: Ф PSII = ( F M ' – F S )/ F M ' ( Liang et al., 2017 ). Measurement of antioxidant enzyme

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Dean A. Kopsell, Carl E. Sams, and Robert C. Morrow

efficient light harvesting to a state of high thermal energy dissipation, which is usually measured as a nonphotochemical quenching of chlorophyll fluorescence ( Havaux et al., 2007 ). Zeaxanthin can modulate blue-light-dependent responses in plants and is

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Cristhian Camilo Chávez-Arias, Sandra Gómez-Caro, and Hermann Restrepo-Díaz

) (F v /F m ), photochemical quenching (qP), and a high nonphotochemical quenching (NPQ) have been reported under waterlogging conditions ( Liu et al., 2014 ; Wu et al., 2015 ). Moderate periods of hypoxia (6–8 d) also have caused a reduction in plant

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Mark W. Farnham and Dean A. Kopsell

integral subunit of light-harvesting complexes in photosynthesis. In plant mutants void of xanthophyll cycle carotenoids, lutein functions in nonphotochemical quenching as a photoprotectant against oxidative damage ( Niyogi et al., 1997 ). The only previous

Open access

Huihui Zhang, Ping Yu, Min Song, Dalu Li, Qianqian Sheng, Fuliang Cao, and Zunling Zhu

, photosynthesis, and growth potential of grafted seedlings ( Zheng et al., 2010 ). They also substantially reduce nonphotochemical quenching and promote light energy absorption and utilization by grafted seedlings ( Li et al., 2017 ; Sang et al., 2017 ). Several

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Yong In Kuk and Ji San Shin

min to fully open all photosystem (PS) II reaction centers (oxidize Qa), and also to dissipate the transthylakoid pH gradient to eliminate nonphotochemical quenching ( Krause et al., 1983 ). A minimal fluorescence yield, F 0 , was obtained upon

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Lingyun Yuan, Yujie Yuan, Shan Liu, Jie Wang, Shidong Zhu, Guohu Chen, Jinfeng Hou, and Chenggang Wang

)/Fm′; 2) the photochemical fluorescence quenching coefficient, qP = (Fm′ − Fs)/(Fm′ − Fo′); 3) nonphotochemical quenching coefficient, qN = (Fm − Fm′)/(Fm′ − Fo′); and 4) the maximal photochemical efficiency of PSII, Fv/Fm = (Fm − Fo)/Fm. Isolation of

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Lie Li, Yu-xin Tong, Jun-ling Lu, Yang-mei Li, and Qi-chang Yang

PSII quantum yield (F v /F m ), the efficiency of excitation capture by the open PSII center (F v ′/F m ′), actual photochemical quantum efficiency (Φ PSII ), electron transfer rate (ETR), photochemical quenching (qP), and nonphotochemical quenching

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Jack Olson and Matthew Clark

. Chl a / b are essential pigments in plants for harvesting light used in photosynthesis to produce energy, and carotenoids are essential for photoprotection of chloroplast photosystems via nonphotochemical quenching ( Bartley and Scolnik, 1995

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David A. Felicetti and Larry E. Schrader

increase indicates a need for increased nonphotochemical quenching capacity, which suggests that the SB peel types received more irradiation than the NB peel type. However, the relative lack of differences among the SB peel types suggests 1) there is no