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- W4249723768 abstract "Abstract: A variety of naturally occurring photosensitizers of plant origin were tested for their ability to cause ultraviolet-A (UVA)-dependent inhibition of photosynthetic 14CO2 fixation in leaf disks of Pisum sativum L. At 0.1 mM concentrations and 60 min UVA irradiation, α-terthienyl was strongly inhibitory, harmine and sanguinarine inhibited to a lesser degree, and curcumin, 8-methoxypsoralen and nordihydroguaiaretic acid had no effect under the conditions tested. Alpha-terthienyl + UVA treatments that fully inhibited 14CO2 fixation had no effect on fresh weight, chlorophyll or protein content of the tissue. Chloroplast malate dehydrogenase and glyceraldehyde-3-phosphate dehydrogenase were inhibited 45% and 29%, respectively, by α-terthienyl + UVA treatment. Electron transport from H2O to the reducing side of photosystem I was inhibited to a similar extent, suggesting interference with the reductive activation of chloroplast enzymes. Alpha-terthienyl + UVA-treated tissue exhibited a seven-fold increase in leakage of labeled photosynthate into the external medium. Treated leaf disks showed no ability to recover 14CO2 fixing ability over a 24 h period. These results indicate photosensitized damage at the level of the thylakoid membranes resulting in partial loss of electron transport capability and more general damage to chloroplast and cell membranes." @default.
- W4249723768 created "2022-05-12" @default.
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- W4249723768 date "1994-06-01" @default.
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- W4249723768 title "PHOTOSENSITIZED INHIBITION OF PHOTOSYNTHETIC14CO2FIXATION BY α-TERTHIENYL AND ULTRAVIOLET-A" @default.
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- W4249723768 doi "https://doi.org/10.1111/j.1751-1097.1994.tb09668.x" @default.
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