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231226s2023 xx |||||o 00| ||eng c |
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|a 10.1111/nph.18514
|2 doi
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|a pubmed25n1155.xml
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|a (NLM)36161283
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Mattila, Heta
|e verfasserin
|4 aut
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|a Singlet oxygen production by photosystem II is caused by misses of the oxygen evolving complex
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|c 2023
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 07.12.2022
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|a Date Revised 15.04.2023
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.
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|a Singlet oxygen (1 O2 ) is a harmful species that functions also as a signaling molecule. In chloroplasts, 1 O2 is produced via charge recombination reactions in photosystem II, but which recombination pathway(s) produce triplet Chl and 1 O2 remains open. Furthermore, the role of 1 O2 in photoinhibition is not clear. We compared temperature dependences of 1 O2 production, photoinhibition, and recombination pathways. 1 O2 production by pumpkin thylakoids increased from -2 to +35°C, ruling out recombination of the primary charge pair as a main contributor. S2 QA - or S2 QB - recombination pathways, in turn, had too steep temperature dependences. Instead, the temperature dependence of 1 O2 production matched that of misses (failures of the oxygen (O2 ) evolving complex to advance an S-state). Photoinhibition in vitro and in vivo (also in Synechocystis), and in the presence or absence of O2 , had the same temperature dependence, but ultraviolet (UV)-radiation-caused photoinhibition showed a weaker temperature response. We suggest that the miss-associated recombination of P680 + QA - is the main producer of 1 O2 . Our results indicate three parallel photoinhibition mechanisms. The manganese mechanism dominates in UV radiation but also functions in white light. Mechanisms that depend on light absorption by Chls, having 1 O2 or long-lived P680 + as damaging agents, dominate in red light
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a FV/FM
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|a anaerobic
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|a anoxia
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|a cyanobacteria
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|a histidine
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|a photodamage
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|a reactive oxygen species
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|a Photosystem II Protein Complex
|2 NLM
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|a Singlet Oxygen
|2 NLM
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|a 17778-80-2
|2 NLM
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| 650 |
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|a Oxygen
|2 NLM
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|a S88TT14065
|2 NLM
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| 700 |
1 |
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|a Mishra, Sujata
|e verfasserin
|4 aut
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|a Tyystjärvi, Taina
|e verfasserin
|4 aut
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| 700 |
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|a Tyystjärvi, Esa
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 237(2023), 1 vom: 05. Jan., Seite 113-125
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnas
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| 773 |
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|g volume:237
|g year:2023
|g number:1
|g day:05
|g month:01
|g pages:113-125
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|u http://dx.doi.org/10.1111/nph.18514
|3 Volltext
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|d 237
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|h 113-125
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