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- W2023902074 abstract "Summary The photosynthetic action spectra and the CO2 compensation points of spruce were measured in an assimilation chamber at two different oxygen levels and at different wavelengths of light in the visible spectrum. Photosynthetic action spectra measured at normal (21%) and low (1%) oxygen levels produce curves which are similar in shape, but the rate at 1% oxygen is 50% higher. No peaks were observed in the blue region and the effect was relatively low in the red region. It appears that by using whole shoots, which exhibit high light absorption, an action spectrum is produced that is unlike the classical action spectrum for photosynthesis, but corresponds to that of natural sunlight between 400 and 600 nm. When photorespiration is measured as the percent inhibition of photosynthesis, it can be concluded that both action spectra are identical. Furthermore, photorespiration appears to be independent of the wavelength of light in the visible spectrum. This conclusion is based on the measurement of photorespiration at different CO2 levels, using the CO2 compensation point method and the percent inhibition method. The pattern exhibited by photorespiration using all three methods shows a direct relationship between photorespiration and photosynthesis in spruce independent of spectral region. This study also demonstrated that the rate of photorespiration increases with the chlorophyll concentration and/or age of leaves in spruce plants between 3 and 6 months old." @default.
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- W2023902074 title "Spectral response of photorespiration effect of plant age and chlorophyll content in spruce" @default.
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