Who stated that there is no translocation at low temperature ?

Swanson and whitney

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Solution

The correct option is A Swanson and whitney
Transport of sugars is a physiological process depends on temperature.
Swanson and Whitney (1953) reported that translocation out of the leaf was highly sensitive to temperature. Optimum temperature for translocation ranges between 20 - 30 $^{o}$ C. The rate of translocation increases with the increase of temperature up to an upper limit and then starts declining.

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