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Annals of Botany 28: 339-344, 1964
© 1964 Annals of Botany Company

RESEARCH-ARTICLE

Translocation and Temperature

CATHERINE M. WHITTLE and BRENDA MARSHALL

The Botany School, the University of Cambridge

The apparent diffusion constant, K, derived from profiles of radioactivity during labelled sucrose translocation, is temperature-dependent with a Q10 of 2.9 in Pteridium. This value is similar to those obtained by other authors for mass transfer rates. The behaviour of K with temperature supports a translocation mechanism of the ‘activated-diffusion’ type and is consistent with the Canny and Phillips translocation model which also suggests a basis for the 25-30° C temperature optimum in translocation.


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