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• W2198226486 endingPage "540" @default.
• W2198226486 startingPage "529" @default.
• W2198226486 abstract "Polyphenol oxidases (PPOs) catalyse the oxidation of monophenols and/or o-diphenols to highly reactive o-quinones, which in turn interact with oxygen and proteins to form reactive oxygen species (ROS) and typical brown-pigmented complexes. Hence PPOs can affect local levels of oxygen and ROS. Although the currently known substrates are located in the vacuole, the enzyme is targeted to the thylakoid lumen, suggesting a role for PPOs in photosynthesis. The current study was designed to investigate the potential involvement of PPOs in the photosynthetic response to oxidative stress.Photosynthesis (A, Fv/Fm, ΦPSII, qN, qP, NPQ) was measured in leaves of a wild-type and a low-PPO mutant of red clover (Trifolium pratense 'Milvus') under control conditions and under a stress treatment designed to induce photooxidative stress: cold/high light (2 °C/580 µmol m(2 )s(-1)) or 0-10 µm methyl viologen. Foliar protein content and oxidation state were also determined.Photosynthetic performance, and chlorophyll and protein content during 4 d of cold/high light stress and 3 d of subsequent recovery under control growth conditions showed similar susceptibility to stress in both lines. However, more extensive oxidative damage to protein in mutants than wild-types was observed after treatment of attached leaves with methyl viologen. In addition, PPO activity could be associated with an increased capacity to dissipate excess energy, but only at relatively low methyl viologen doses.The presence of PPO activity in leaves did not correspond to a direct role for the enzyme in the regulation or protection of photosynthesis under cold stress. However, an indication that PPO could be involved in cellular protection against low-level oxidative stress requires further investigation." @default.
• W2198226486 created "2016-06-24" @default.
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• W2198226486 date "2015-06-03" @default.
• W2198226486 modified "2023-09-26" @default.
• W2198226486 title "Polyphenol oxidase-mediated protection against oxidative stress is not associated with enhanced photosynthetic efficiency" @default.
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• W2198226486 doi "https://doi.org/10.1093/aob/mcv081" @default.
• W2198226486 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4577998" @default.
• W2198226486 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26041733" @default.
• W2198226486 hasPublicationYear "2015" @default.
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