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.

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

scholarly journals Mechanism of Photodamage of the Oxygen Evolving Mn Cluster of Photosystem II by Excessive Light Energy

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Alonso Zavafer ◽  
Wataru Koinuma ◽  
Wah Soon Chow ◽  
Mun Hon Cheah ◽  
Hiroyuki Mino
Keyword(s):  
Photosystem Ii ◽  
Light Energy ◽  
Mn Cluster ◽  
Oxygen Evolving

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

Primary light-energy conversion in tetrameric chlorophyll structure of photosystem II and bacterial reaction centers: I. A review

2008 ◽  
Vol 98 (1-3) ◽  
pp. 81-93 ◽  
Author(s):  
Ravil A. Khatypov ◽  
Anton Yu. Khmelnitskiy ◽  
Maria M. Leonova ◽  
Lyudmila G. Vasilieva ◽  
Vladimir A. Shuvalov
Keyword(s):  
Photosystem Ii ◽  
Energy Conversion ◽  
Reaction Centers ◽  
Light Energy ◽  
Bacterial Reaction Centers ◽  
Light Energy Conversion

A few molecules of zeaxanthin per reaction centre of photosystem II permit effective thermal dissipation of light energy in photosystem II of a poikilohydric moss

Planta ◽  
2001 ◽  
Vol 212 (5-6) ◽  
pp. 739-748 ◽  
Author(s):  
N. G. Bukhov ◽  
J. Kopecky ◽  
E. E. Pfündel ◽  
C. Klughammer ◽  
U. Heber
Keyword(s):  
Photosystem Ii ◽  
Light Energy ◽  
Thermal Dissipation ◽  
Reaction Centre

scholarly journals Chlorophyll Composition, Chlorophyll Fluorescence, and Grain Yield Change in esl Mutant Rice

2018 ◽  
Vol 19 (10) ◽  
pp. 2945 ◽  
Author(s):  
Weiwei Lin ◽  
Xiaodong Guo ◽  
Xinfeng Pan ◽  
Zhaowei Li
Keyword(s):  
Photosystem Ii ◽  
Reaction Center ◽  
Binding Protein ◽  
Grain Filling ◽  
Fluorescence Yield ◽  
Light Energy ◽  
Grain Weight ◽  
Filling Stage ◽  
Grain Filling Stage ◽  
1000 Grain Weight

To evaluate the effect of changes in chlorophyll (Chl) composition and fluorescence on final yield formation, early senescence leaf (esl) mutant rice and its wild-type cultivar were employed to investigate the genotype-dependent differences in Chl composition, Chl fluorescence, and yield characteristics during the grain-filling stage. However, the temporal expression patterns of key genes involved in the photosystem II (PSII) reaction center in the leaves of two rice genotypes were analyzed by quantitative real-time polymerase chain reaction (qRT-PCR). Results showed that the seed-setting rate, 1000-grain weight, and yield per plant remarkably decreased, and the increase in the 1000-grain weight during the grain-filling stage was retarded in esl mutant rice. Chl composition, maximal fluorescence yield (Fm), variable fluorescence (Fv), a maximal quantum yield of PSII photochemistry (Fv/Fm), and net photosynthetic rate (Pn) in esl mutant rice considerably decreased, thereby indicating the weakened abilities of light energy harvesting and transferring in senescent leaves. The esl mutant rice showed an increase in the minimal fluorescence yield (F0) and 1 − Fv/Fm and decreases in the expression levels of light-harvesting Chl a/b binding protein (Cab) and photosystem II binding protein A (PsbA), PsbB, PsbC, and PsbD encoding for the reaction center of the PSII complex during the grain-filling stage. These results indicated the PSII reaction centers were severely damaged in the mesophyll cells of senescent leaves, which resulted in the weakened harvesting quantum photon and transferring light energy to PSI and PSII for carbon dioxide assimilation, leading to enhanced heat dissipation of light energy and a decrease in Pn.

Sign in / Sign up

Export Citation Format

Share Document