Carbon Flux in Apple Trees: The Effects of Temperature and Light Intensity on Photosynthetic Rates1
Open Access
- 1 November 1977
- journal article
- Published by American Society for Horticultural Science in Journal of the American Society for Horticultural Science
- Vol. 102 (6) , 731-733
- https://doi.org/10.21273/jashs.102.6.731
Abstract
The effects of light intensity and leaf temperature on the net photosynthetic rate of rapidly growing ‘Golden Delicious’ apple (Malus domestica Borkh.) shoots were determined in a temperature range (-1.6 to 44°C) broader than previously reported. Under saturating light conditions the rate of CO2 uptake increased with leaf temperature to 2.7 g CO2 m2hr-1 at 25°. Optimum temperature decreased as the light intensity decreased, indicating a relationship between temperature and light saturation levels. At 25 to 30° the light saturation point was equivalent to 86 W/m2 of incident electromagnetic energy at wavelengths of 400 to 750 nm. At temperatures higher than the optimum, the rate of carbon dioxide uptake decreased rapidly. At 47 to 50° and high light intensities, the rate of carbon dioxide uptake was 0.3 to 0.5 g CO2 m-2hr-l.Keywords
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