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Temperature Coefficients in Plant Pathology. C. E. Yarwood, Professor, Department of Plant Pathology, University of California, Berkeley 94720.  Phytopathology 65:1198-1201.

Temperature coefficient (Q10) for growth of plant pathogens and other organisms is about 3 below the optimum temperature and 9 above the optimum temperature.[sic]  Q10 is useful or essential in studies of heat inactivation and heat therapy, and averages about 100 for these purposes, but differs greatly for different situations, and decreases with increasing temperature.  Q10 for heat injury to higher plants is usually lower than for inactivation of microorganisms including plant pathogens.  Q10's for heat inactivation of fungi, bacteria, and viruses are not clearly different.  The highest Q10 observed in this study was about 150 for inactivation of tobacco mosaic virus, and the lowest was 7 for tobacco necrosis virus.


Additional key words: control of phytoalexin synthesis.