Sinks--integral parts of a whole plant.
It is argued that it is not possible to predict the flux of assimilate into a sink by making a measurement on that sink alone. Rather carbon flux is a whole-plant property and can only be predicted from measurements made simultaneously in source leaves and sinks, and the transport system itself.
School of Biological Sciences, University of Wales Bangor, Bangor, Gwynedd LL57 2UW, UK.
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