The Botany School, University of Cambridge, Cambridge, England.
Planta. 1970 Sep;95(3):247-63. doi: 10.1007/BF00385091.
The profile of (14)C, 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 (14)C to a leaf. These seedlings are shown to accumulate a large proportion of the total (14)C 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 (14)C but the later part of the profile is different in the two groups. This difference would be expected if lateral movement of (14)C out of the translocation stream were mainly irreversible in these Helianthus plants but mainly reversible in plants of the other group.
对向日葵幼苗进行喂食 (14)C 后的第一个小时内，研究了 (14)C 的分布情况，即放射性对距离的对数图。这些幼苗显示，它们以乙醇不溶性形式积累了茎中存在的大部分总 (14)C。本文考虑了这种积累对分布曲线形状的影响。在向日葵和几乎不积累不溶性 (14)C 的植物中，前进前沿的陡峭形状和行为相似，但两组的分布曲线的后一部分不同。如果在这些向日葵植物中， (14)C 从转运流中向外的侧向移动主要是不可逆的，而在另一组植物中主要是可逆的，那么这种差异是可以预期的。
