Psb27, a photosystem II assembly protein, enables quenching of excess light energy during its participation in the PSII lifecycle

2022 ◽  
Author(s):  
Virginia M. Johnson ◽  
Sandeep Biswas ◽  
Johnna L. Roose ◽  
Himadri B. Pakrasi ◽  
Haijun Liu
Keyword(s):  
Photosystem Ii ◽  
Light Energy ◽  
Excess Light

The Excess Light Energy that is neither Utilized in Photosynthesis nor Dissipated by Photoprotective Mechanisms Determines the Rate of Photoinactivation in Photosystem II

2003 ◽  
Vol 44 (3) ◽  
pp. 318-325 ◽  
Author(s):  
Masaharu C. Kato ◽  
Kouki Hikosaka ◽  
Naoki Hirotsu ◽  
Amane Makino ◽  
Tadaki Hirose
Keyword(s):  
Photosystem Ii ◽  
Light Energy ◽  
Excess Light

Reaction centre quenching of excess light energy and photoprotection of photosystem II

2008 ◽  
Vol 51 (2) ◽  
pp. 85-96 ◽  
Author(s):  
Alexander G. Ivanov ◽  
Vaughan Hurry ◽  
Prafullachandra V. Sane ◽  
Gunnar Öquist ◽  
Norman P. A. Huner
Keyword(s):  
Photosystem Ii ◽  
Light Energy ◽  
Reaction Centre ◽  
Excess Light

Different strategies of acclimation of photosynthesis, electron transport and antioxidative activity in leaves of two cotton species to water deficit

2016 ◽  
Vol 43 (5) ◽  
pp. 448 ◽  
Author(s):  
Xiao-Ping Yi ◽  
Ya-Li Zhang ◽  
He-Sheng Yao ◽  
Hong-Hai Luo ◽  
Ling Gou ◽  
...  
Keyword(s):  
Electron Transport ◽  
Water Deficit ◽  
Heat Dissipation ◽  
Photosynthetic Apparatus ◽  
Light Energy ◽  
Photochemical Quenching ◽  
Antioxidant Systems ◽  
Mehler Reaction ◽  
Cotton Species ◽  
Excess Light

To better understand the adaptation mechanisms of the photosynthetic apparatus of cotton plants to water deficit conditions, the influence of water deficit on photosynthesis, chlorophyll a fluorescence and the activities of antioxidant systems were determined simultaneously in Gossypium hirsutum L. cv. Xinluzao 45 (upland cotton) and Gossypium barbadense L. cv. Xinhai 21 (pima cotton). Water deficit decreased photosynthesis in both cotton species, but did not decrease chlorophyll content or induce any sustained photoinhibition in either cotton species. Water deficit increased ETR/4 − AG, where ETR/4 estimates the linear photosynthetic electron flux and AG is the gross rate of carbon assimilation. The increase in ETR/4 − AG, which represents an increase in photorespiration and alternative electron fluxes, was particularly pronounced in Xinluzao 45. In Xinluzao 45, water deficit increased the activities of antioxidative enzymes, as well as the contents of reactive oxygen species (ROS), which are related to the Mehler reaction. In contrast, moderate water deficit particularly increased non-photochemical quenching (NPQ) in Xinhai 21. Our results suggest that Xinluzao 45 relied on enhanced electron transport such as photorespiration and the Mehler reaction to dissipate excess light energy under mild and moderate water deficit. Xinhai 21 used enhanced photorespiration for light energy utilisation under mild water deficit but, when subjected to moderate water deficit, possessed a high capacity for dissipating excess light energy via heat dissipation.

Responses of the photosynthetic electron transport system to excess light energy caused by water deficit in wild watermelon

2011 ◽  
Vol 142 (3) ◽  
pp. 247-264 ◽  
Author(s):  
Satoko Sanda ◽  
Kazuo Yoshida ◽  
Masayoshi Kuwano ◽  
Tadayuki Kawamura ◽  
Yuri Nakajima Munekage ◽  
...  
Keyword(s):  
Electron Transport ◽  
Water Deficit ◽  
Transport System ◽  
Photosynthetic Electron Transport ◽  
Light Energy ◽  
Electron Transport System ◽  
Excess Light

Diurnal modulation of PEPCK decarboxylation activity impacts photosystem II light-energy use in a drought-induced CAM species

2020 ◽  
Vol 173 ◽  
pp. 104003 ◽  
Author(s):  
Filipe C. Pikart ◽  
Alejandra Matiz ◽  
Frederico R.R. Alves ◽  
Helenice Mercier
Keyword(s):  
Photosystem Ii ◽  
Energy Use ◽  
Light Energy ◽  
Cam Species

Xanthophyll cycle, light energy dissipation and photosystem II down-regulation in senescent leaves of wheat plants grown in the field

2001 ◽  
Vol 28 (10) ◽  
pp. 1023 ◽  
Author(s):  
Congming Lu ◽  
Qingtao Lu ◽  
Jianhua Zhang ◽  
Qide Zhang ◽  
Tingyun Kuang
Keyword(s):  
Energy Dissipation ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
Xanthophyll Cycle ◽  
Light Energy ◽  
Photochemical Quenching ◽  
Down Regulation ◽  
Psii Efficiency ◽  
Psii Photochemistry ◽  
Assimilation Capacity

Photosynthesis, the xanthophyll cycle, light energy dissipation and down-regulation of photosystem II (PSII) in senescent leaves of wheat plants grown in the field were investigated. With the progress of senescence, maximal efficiency of PSII photochemistry decreased only slightly early in the morning but substantially at midday. Actual PSII efficiency, photochemical quenching, efficiency of excitation capture by open PSII centres, and the I–P phase of fluorescence induction curves decreased significantly and such decreases were much more evident at midday than in the morning. At the same time, non-photochemical quenching, thermal dissipation and de-epoxidation status of the xanthophyll cycle increased, with much greater increases at midday than in the morning. These results suggest that the xanthophyll cycle played a role in photoprotection of PSII in senescent leaves by dissipating excess excitation energy. Taking into account the substantial decrease in photosynthetic capacity in senescent leaves, our data seem to support the view that the decrease in actual PSII efficiency in senescent leaves may represent a mechanism to down-regulate photosynthetic electron transport to match the decreased CO2 assimilation capacity and avoid photodamage of PSII from excess excitation energy.

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