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Shuyang Zhen and Marc W. van Iersel

dissipated as heat and a small fraction is re-emitted as chlorophyll fluorescence ( Maxwell and Johnson, 2000 ). The quantum yield of photosystem II, the efficiency with which photosystem II (PSII) uses absorbed photons for electron transport, or the moles of

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Marc W. van Iersel, Geoffrey Weaver, Michael T. Martin, Rhuanito S. Ferrarezi, Erico Mattos, and Mark Haidekker

(top) and a simplified diagram of the duty cycle control board (bottom). A fluorometer is used to measure the quantum yield of photosystem II and the datalogger calculates the electron transport rate from this and the photosynthetic photon flux density

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Kaylee A. South, Paul A. Thomas, Marc W. van Iersel, Cindy Young, and Michelle L. Jones

thermocouple was placed in the bark ≈5 cm below an aerial root. Temperature data were collected every 5 min for 3 h after an irrigation event. Quantum yield of photosystem II and chlorophyll content. At the beginning of the experiment, the newest-most fully

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Geoffrey Weaver and Marc W. van Iersel

µmol·m –2 ·s –1 . Fig. 2. Quantum yield of photosystem II (Φ PSII ) of ‘Green Towers’ lettuce as a function of photosynthetic photon flux density ( PPFD ) based on 35 d of constant diurnal monitoring. Closed symbols represent measurements taken before

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Namiko Yamori, Yoriko Matsushima, and Wataru Yamori

different directions on the indoor management of rose plants. We analyzed the contents of photosynthetic components and the maximum quantum yield of photosystem II (Fv/Fm) to determine the effects of each treatment on the photosynthetic characteristics of

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David H Suchoff, Christopher C. Gunter, Jonathan R. Schultheis, Matthew D. Kleinhenz, and Frank J. Louws

fluorometer (LI-6400XT; LI-COR, Inc., Lincoln, NE). Net CO 2 assimilation ( A , µmol·m −2 ·s −1 ), g S (mmol·m −2 ·s −1 ), and effective quantum yield of photosystem II (φ PSII ) were measured between 10 am and 1 pm. Photosynthetic photon flux density

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Wei Hu, Qing Di, Jingyi Wei, Jie Zhang, and Jia Liu

same rootstock were not significant in each chlorophyll fluorescence parameter. Fig. 4. Effects of grafting and potassium level on the minimal fluorescence yield of the dark-adapted state (F 0 ), maximal quantum yield of photosystem II (PSII

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Toshio Shibuya, Ryosuke Endo, Yuki Kitamura, Yoshiaki Kitaya, and Nobuaki Hayashi

under FL H or 6 d under ML, sample seedlings from each treatment group were taken to measure the net photosynthetic rate (P n ) and quantum yield of photosystem II photochemistry (Ф PSII ; Maxwell and Johnson, 2000 ). Because of the faster development

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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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Haiyan Zhao, Haiying Liang, Yibing Chu, Congcong Sun, Ning Wei, Mengnan Yang, and Caixia Zheng

decrease occurred. Fig. 3. Effects of NaCl on ( A ) maximum quantum yield of photosystem II (PSII) photochemistry ( F v /F m ), ( B ) actual quantum yield of PSII photochemistry (Φ PSII ), ( C ) nonphotochemical quenching coefficient (q N ), and ( D