Summary
The profile of 14C, that is the plot of log (radioactivity) against distance, down the stem of Helianthus seedlings was studied over the course of the first hour after feeding 14C to a leaf. These seedlings are shown to accumulate a large proportion of the total 14C present in the stem in an ethanol insoluble form. The effect of this accumulation on the shape of the profile is considered. The steep advancing front is similar in shape and behaviour in Helianthus and in plants which show little accumulation of insoluble 14C but the later part of the profile is different in the two groups. This difference would be expected if lateral movement of 14C out of the translocation stream were mainly irreversible in these Helianthus plants but mainly reversible in plants of the other group.
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Whittle, C.M. Lateral movement out of the sieve tubes and its effect on the 14C translocation profile in Helianthus seedlings. Planta 95, 247–263 (1970). https://doi.org/10.1007/BF00385091
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DOI: https://doi.org/10.1007/BF00385091