| 1. |
Tsukasa Tanizaki, Gaku Yokoyama, Masaharu Kitano, Daisuke Yasutake, Contribution of diffusional and non-diffusional limitations to the midday depression of photosynthesis which varies dynamically even under constant environmental conditions, International Agrophysics, 10.31545/intagr/151055, 36, 3, 207-212, 2022.08, Both diffusional and non-diffusional limitation factors and their contribution to the phenomenon known as midday depression were studied; a decrease in photosynthesis due to environmental stress. Measurements of leaf gas exchange (transpiration rate, stomatal conductance, photosynthetic rate) and related parameters (intercellular CO2 concentration, maximum carboxylation, diffusional limitation index, leaf water potential) were determined over time from cucumber plants under constant environmental conditions. The experiment may be divided into three periods. Period 1 occurred when both photosynthetic rate and stomatal conductance increased, period 2 occurred when photosynthetic rate decreased but stomatal conductance remained constant, period 3 occurred with the decrease in both photosynthetic rate and stomatal conductance. Photosynthetic rate increased immediately, post-illumination, and reached its maximum value during period 1, then it decreased to half this value for the remainder of the experiment, indicating that a midday depression had occurred. During period 2, diffusional limitation index was around 50% and then increased while maximum carboxylation sharply decreased, suggesting the existence of both non-diffusional and diffusional limitations. In period 3, stomatal conductance decreased due to decreasing leaf water potential, and diffusional limitation index increased, suggesting that diffusional limitation was dominant at this stage. Thus, it was found that there are multiple dominant factors in midday depression, and that these factors are dynamic even under constant environmental conditions.. |
| 2. |
Daisuke Yasutake, Tomoyo Yanagisawa, Kazuya Shiraishi, Takuro Suyama, Hiroshi Matsui, Gaku Yokoyama, Tomoyoshi Hirota, Spatiotemporal temperature distribution in the canopy of summer-to-autumn flowering chrysanthemum under different zone cooling methods, International Agrophysics, 10.31545/intagr/159164, 37, 2, 129-139, 2023.03. |
| 3. |
G. YOKOYAMA, S. ONO, D. YASUTAKE, K. HIDAKA, T. HIROTA, Diurnal changes in the stomatal, mesophyll, and biochemical limitations of photosynthesis in well-watered greenhouse-grown strawberries, Photosynthetica, 10.32615/ps.2023.001, 2023.01. |
| 4. |
Daisuke Yasutake, Gaku Yokoyama, Kyosuke Maruo, Yueru Wu, Weizhen Wang, Makito Mori, Masaharu Kitano., Analysis of leaf wetting effects on gas exchanges of corn using a whole-plant chamber system, Plant, Soil and Environment, 10.17221/186/2018-pse, 64, 5, 233-239, 2018.05. |
| 5. |
Shintaro ONO, Daisuke YASUTAKE, Gaku YOKOYAMA, Yoshiya TERUYA, Kota HIDAKA, Takashi OKAYASU, Koichi NOMURA, Masaharu KITANO, Closed Chamber System for Easily Measuring the Respiration Rate of Intact Fruits, Environment Control in Biology, 10.2525/ecb.60.33, 60, 1, 33-37, 2022.01. |
| 6. |
Gaku Yokoyama, Daisuke Yasutake, Keisuke Minami, Kensuke Kimura, Atsushi Marui, Wu Yueru, Jiaojiao Feng, Weizhen Wang, Makito Mori, Masaharu Kitano, Evaluation of the physiological significance of leaf wetting by dew as a supplemental water resource in semi-arid crop production, Agricultural Water Management, 10.1016/j.agwat.2021.106964, 255, 106964-106964, 2021.09. |
| 7. |
Gaku Yokoyama, Daisuke Yasutake, Tsukasa Tanizaki, Masaharu Kitano., Leaf wetting mitigates midday depression of photosynthesis in tomato plants, Photosynthetica, 10.32615/ps.2019.088, 57, 3, 740-747, 2019.07. |
| 8. |
Gaku Yokoyama, Daisuke Yasutake, Weizhen Wang, Yueru Wu, Jiaojiao Feng, Leilei Dong, Kensuke Kimura, Atsushi Marui, Tomoyoshi Hirota, Masaharu Kitano, Makito Mori, Limiting factor of dew formation changes seasonally in a semiarid crop field of northwest China, Agricultural and Forest Meteorology, 10.1016/j.agrformet.2021.108705, 311, 108705-108705, 2021.12. |
