Perspective on Function of Free Space in Ion Uptake by Roots

See allHide authors and affiliations

Science  12 May 1961:
Vol. 133, Issue 3463, pp. 1482-1483
DOI: 10.1126/science.133.3463.1482


An observed effect of longitudinal flow rate through corn roots on phosphate transport is shown to be inconsistent with diffusion theory. R. C. Smith's results confirm rather the existence of a diffusion barrier between the xylem and the free space external to the central cylinder of the root.