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Development of valid temperature-based models of physiological processes such as seed germination, bud development, vegetative growth, fruit development, or fruit maturation, requires a parameter to link temperature with plant metabolism. The Thermal Kinetic Window (TKW) concept uses the temperature characteristics of an enzyme kinetic parameter, the Michaelis constant ( K m) as indicators of metabolic efficiency. Recently, Burke 3  has shown that the temperature dependence of the rate and magnitude of the reappearance of photosystem II (PSII) variable fluorescence following illumination corresponded with the optimal temperature described by the TKW for several plant species. The present study investigated the use of the temperature sensitivity of PSII fluorescence in the identification of temperature optima of apple cultivars and rootstocks.  3 Burke, J.J. 1990. Plant Physiol. 93:652-656.

hortscience

DETERMINING TEMPERATURE OPTIMA OF APPLE CULTIVARS AND ROOTSTOCKS BY THE TEMPERATURE-DEPENDENT REAPPEARANCE OF VARIABLE FLUORESCENCE FOLLOWING ILLUMINATION