AbstractExperiments were conducted withEchinochloa crus‐gallito partition the effects of chilling the leafvs.chilling the whole plant on subsequent11C translocation. The results clearly demonstrated that whole plant chilling was very detrimental whereas chilling only the leaf had no effect on subsequent translocation nor on11C uptake. The inhibition of translocation was due to a reduced rate and percentage of export while11C fixation rate was not significantly altered. When the leaf of a chilled plant was maintained at 22 °C, there was no impairment of the transport system nor of photosynthesis. The decrease in export with whole plant chilling may have been due to carbon movement into storage carbohydrates, resulting in a low sucrose gradie