Investigations of Carbon Transport in Plants

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Abstract
The use of 11C as a tracer has allowed repetitive measurements of the speed of assimilate translocation to be made on single maize plants throughout prolonged periods of light and darkness. The speed appeared to double when the light was switched on. The time required to achieve a maximum speed, usually about 3·5 cm min−1, depended on the duration of the previous dark period. When the plant was transferred to darkness the speed immediately decreased by about 20 per cent and continued to decrease over the next 20 h to values of 0·5 to 0·9 cm min−1. The mean speed of translocation in tomato in the light, and other C3 plants, was usually about 1 cm min−1. It was reduced by 15–30 per cent when the fruit was removed or cooled from 26 to 10°C.

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