التفاصيل البيبلوغرافية
| العنوان: |
Plastid terminal oxidase (PTOX) protects photosystem I and not photosystem II against photoinhibition in Arabidopsis thaliana and Marchantia polymorpha. |
| المؤلفون: |
Messant, Marine, Hani, Umama, Lai, Thanh‐Lan, Wilson, Adjélé, Shimakawa, Ginga, Krieger‐Liszkay, Anja |
| المصدر: |
Plant Journal; Feb2024, Vol. 117 Issue 3, p669-678, 10p |
| مصطلحات موضوعية: |
PHOTOSYSTEMS, RELIEF valves, LIGHT intensity, ABIOTIC stress, PHOTOSYNTHESIS, SPECIAL effects in lighting |
| مستخلص: |
SUMMARY: The plastid terminal oxidase PTOX controls the oxidation level of the plastoquinone pool in the thylakoid membrane and acts as a safety valve upon abiotic stress, but detailed characterization of its role in protecting the photosynthetic apparatus is limited. Here we used PTOX mutants in two model plants Arabidopsis thaliana and Marchantia polymorpha. In Arabidopsis, lack of PTOX leads to a severe defect in pigmentation, a so‐called variegated phenotype, when plants are grown at standard light intensities. We created a green Arabidopsis PTOX mutant expressing the bacterial carotenoid desaturase CRTI and a double mutant in Marchantia lacking both PTOX isoforms, the plant‐type and the alga‐type PTOX. In both species, lack of PTOX affected the redox state of the plastoquinone pool. Exposure of plants to high light intensity showed in the absence of PTOX higher susceptibility of photosystem I to light‐induced damage while photosystem II was more stable compared with the wild type demonstrating that PTOX plays both, a pro‐oxidant and an anti‐oxidant role in vivo. Our results shed new light on the function of PTOX in the protection of photosystem I and II. Significance Statement: In photosynthesis, PTOX activity is important for keeping the plastoquinone pool oxidized upon light stress and acts as a safety valve protecting photosystem I against photodamage. In mutants lacking PTOX electron flow to photosystem I is not restricted, preventing partially the accumulation of P700+. As a consequence photosystem I is more easily damaged by excess light. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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