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• W2108794651 endingPage "1817" @default.
• W2108794651 startingPage "1807" @default.
• W2108794651 abstract "Photoacclimation was examined in the marine diatom Skeletonema costatum, which was subjected to reciprocal shifts between irradiances of 50 (low-light) and 1,200 (high-light) µmol photons m−2 s−1. Cell chlorophyll a and fucoxanthin contents were higher but diadinoxanthin and diatoxanthin contents lower in cells grown at 50 µmol photons m−2 s−1 than in cells shifted to 1200 µmol photons m−2 s−1. Cell carbon contents measured at the start of the light period were similar in both high-light an low-light treatments. However, by 6 h into the light period, the carbon contents in the high-light cells were about twofold higher than in the low-light cells. Dark respiration rates, dark Chl a synthesis rates, and dark cell-division rates were greater in the high-light acclimated cells than in the low-light cells. Thus, there was a greater uncoupling of carbon assimilation from cell division during the day in the high-light cells, but pigment synthesis and cell division continued in darkness. Cell-specific, light saturated photosynthesis rates, and chlorophyll a specific lightlimited photosynthesis rates were constant during reciprocal shifts between growth irradiances of 50 and 1200 µmol photons m−2s−1. Thus, differences of photosynthesis versus irradiance curves between cells acclimated to high-light versus low-light could be accounted for largely in terms of changes in cell chlorophyll a contents. Although the chlorophyll a-specific initial slope, αchl, was constant, the chlorophyll a-specific light absorbtion coeffecient, achl, increased and the maximum quantum efficiency of photosynthesis (φm) declined following the shift to high light. The increase of achl was most likely due to a decreased package effect. The decline of φm was most likely due to accumulation of xanthophyll cycle pigments. Carbon-specific, light-saturated photosynthesis rates were lower in high-light than in low-light cells; this observation may indicate that control of light-saturated photosynthesis shifts from enzymes of the carbon dioxide reduction cycle (Calvin cycle) in low-light cells to the photosynthetic electron transfer chain in high-light cells." @default.
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• W2108794651 date "2000-12-01" @default.
• W2108794651 modified "2023-10-18" @default.
• W2108794651 title "Photoacclimation in the marine diatom <i>Skeletonema costatum</i>" @default.
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• W2108794651 doi "https://doi.org/10.4319/lo.2000.45.8.1807" @default.
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