Real Time Studies of Carbon-11 Translocation in Moonflower

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Abstract
Naturally loaded carbon-11 was used to study in vivo the dynamics of translocation. It was found that translocation displayed strong short-term sensitivity to source chilling, source anoxia, disturbance of the osmotic balance of stem apoplast, and apex shading but that it seemed indifferent to metabolic inhibitors and stem anoxia. Plant-wide water stress effected a long-term disruption of translocation which was reversed only slowly when the stress was relieved. These experiments generally support a mass flow theory, but indicate that there is a close coupling between translocation streams from different sources.

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