Translocation of Particles within Plants

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Abstract
It is evident that plants have very effective translocation systems capable of rapidly moving very small particles, such as K ions, which are only about 2 angstroms in diameter, or of moving relatively large particles, some even as long as 20,000 times the diameter of a K ion. At the small end of the size scale the dimensions of particles may not influence their translocation, but when particles farther up the size scale (molecules) are involved, dimensions may become more important. At the large end of the size scale (macromolecules), dimensions may be critical. Although we have learned some facts about mechanisms involved in translocation, many questions still remain. The answers that afford an understanding of translocation from a broad viewpoint will necessarily explain how plants translocate particles that vary so widely in size as well as in other characteristics.