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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 (Km) as indicators of metabolic efficiency. Recently, Burke3 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. 3Burke, J.J. 1990. Plant Physiol. 93:652-656.

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Abstract

In March of 1975, the News & Views newsletter of the American Horticultural Society offered the following anonymous tip under the heading of Cold Shower Treatment: “Here is a trick that will reduce the amount of damage caused by morning sunlight on frozen buds. Where plants have been lightly touched with frost, take a hand syringe and spray the vulnerable buds with water before sunlight strikes them.” The following spate of correspondence formed the basis of this “postal symposium.”

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