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The Translocation Profile: Sucrose and Carbon Dioxide

M. J. CANNY
Annals of Botany
New Series, Vol. 26, No. 102 (APRIL 1962), pp. 181-196
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/42907646
Page Count: 16
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The Translocation Profile: Sucrose and Carbon Dioxide
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Abstract

The ¹⁴CO₂ produced from translocated sucrose-¹⁴C has been measured during the first minutes of the arrival of the translocation profile in Salix stem. The shape of the curve of ¹⁴CO₂-time is shown to resemble that for the radioactivitytime of sucrose-¹⁴C exuded from the phloem through cut aphid stylets, and to reflect the shape of the sucrose-¹⁴C-distance profile in the stem. The ¹⁴CO₂-time profile may be used with the sucrose-¹⁴C-distance profile to estimate the velocity of movement of the latter. A constant proportion of the sucrose-¹⁴C in the stem breaks down to ¹⁴CO₂ in the steady state attained after the passage of the profile.

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