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Annals of Botany 35: 9-15, 1971
© 1971 Annals of Botany Company

RESEARCH-ARTICLE

The Effect of Temperature on the Respiration of 14C-Labelled Sugars in Stems of Willow

C. L. COULSON and A. J. PEEL

Department of Botany, University of Hull

Received: 21 April 1970   

The leaves of willow cuttings were allowed to assimilate 14CO2, and the rate of increase of activity in the sieve-tube sap, collected as aphid honeydew, was compared with the output of respiratory 14CO2 from the stem at 25 °C and at 0 °C.

In the case of 3–5-week-old young shoots, the relative rate of breakdown of the 14C-labelled sugars was reduced at 0 °C as compared with 25 °C. With 2–4-year-old mature stems, however, the rate of breakdown of labelled sugars in transit through the phloem was increased at 0 °C relative to that at 25 °C. When the labelled sugars were being respired in isolated stem segments where no transport was taking place, then low temperatures markedly reduced the rate of breakdown in both young shoots and mature stems.

These results are discussed in relation to the results of other workers who have studied temperature effects on sieve-tube transport.


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