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- W2020793921 abstract "The application of a leaf disc electrode to the measurement of the quantum yield of photosynthetic oxygen evolution (in saturating carbon dioxide concentrations) is described. The technique was also used to characterize the light-saturation curves for photosynthesis in leaves of spinach plants grown in relatively low (‘shade’) and high (‘sun’) light intensities. It was found that the flux of a blue excitation light required to elicit oscillations in chlorophyll a fluorescence corresponded, approximately, to the flux of (white) light required to saturate photosynthetic oxygen evolution. The requirement was higher for leaves of sun-grown plants (approximately 800 μmol m -2 s -1 ) than for shade-grown plants (approximately 200 μmol m -2 s -1 ). Brief pretreatment of leaf discs from sun-grown plants with D-mannose did not change the quantum yield, but lowered the light saturated rate and the photon flux density required to saturate photosynthesis. Oscillations in fluorescence could then be observed at lower fluxes of blue excitation light, similar to those required by leaves from shade-grown plants. Photoinhibition of shade-grown plants (exposed to full sunlight for 5 h) reduced quantum yield and increased the light flux required for saturation of photosynthesis. Oscillations in fluorescence, normally observed at low fluxes of blue light in these leaves, could not be detected after photoinhibition. These correlations are interpreted and applications of the techniques described are discussed." @default.
- W2020793921 created "2016-06-24" @default.
- W2020793921 date "1986-04-22" @default.
- W2020793921 modified "2023-09-27" @default.
- W2020793921 title "Measurement of photosynthesis<i>in vivo</i>with a leaf disc electrode: correlations between light dependence of steady-state photosynthetic O<sub>2</sub>evolution and chlorophyll<i>a</i>fluorescence transients" @default.
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- W2020793921 doi "https://doi.org/10.1098/rspb.1986.0023" @default.
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