Net photosynthetic rate of potato at high temperatures |
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Authors: | P S Hammes J A De Jager |
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Institution: | (1) Department of Plant Production, University of Pretoria, 0002 Pretoria, South Africa |
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Abstract: | Summary Potato cultivars were grown in a glasshouse and plants periodically transferred to a growth chamber. When the ambient temperature
in the growth chamber was raised from 15 to 40°C in steps of 5°C per hour, net photosynthetic rate decreased at temperatures
above 20°C. At 40°C the rate was 37% of the rate at 20°C. A greater decrease in net photosynthetic rate occurred with plants
of the cultivar Up-to-Date than with cultivars R100 and BP13. Low values of leaf diffusive resistance were recorded and changes
in photosynthetic rate could not be explained by changes in this factor. When a constant ambient air temperature of 20°C was
maintained while soil temperature was increased, net photosynthetic rate decreased. |
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Keywords: | diffusive resistance heat stress Solanum tuberosum L |
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