Distribution of 14C-labelled Products of Photosynthesis during the Commercial Life of the Tomato Crop

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Abstract
On seven occasions measured amounts of 14CO2 were supplied to individual leaves on tomato plants grown as a crop under commercial conditions. Twenty-four hours later the distribution of radiocarbon products was determined using counting procedures. In the vegetative phase lower leaves exported more carbon up than down, and upper leaves a larger proportion downwards. During the development of the crop upper leaves continued to export more carbon down than up, and lower leaves developed a similar tendency. In the young fruiting crop all leaves supplied all the trusses, but as the number of trusses increased groups of leaves came to have primary (but not absolute) responsibility for supplying single trusses. At the time of fruit development the leaves retained for 20–24 hours more than 80 per cent of the carbon they fixed. Mature leaves and stems both above and below the test leaves were significant sinks for 14C products.

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