Potato Research

, Volume 33, Issue 4, pp 515–520

Net photosynthetic rate of potato at high temperatures

  • P. S. Hammes
  • J. A. De Jager
Short Communication

DOI: 10.1007/BF02358030

Cite this article as:
Hammes, P.S. & De Jager, J.A. Potato Res (1990) 33: 515. doi:10.1007/BF02358030

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.

Additional key words

diffusive resistanceheat stressSolanum tuberosum L

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • P. S. Hammes
    • 1
  • J. A. De Jager
    • 1
  1. 1.Department of Plant ProductionUniversity of PretoriaPretoriaSouth Africa