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Journal of Experimental Botany, Vol 49, 1539-1544, Copyright © 1998 by Oxford University Press

ARTICLES

Solute concentrations in xylem sap along vessels of maize primary roots at high root pressure

L Enns, M McCully and M Canny
Biology Department, Carleton University, 1125 Colonel By Drive, Ottawa, Canada K1S 5B6; Corresponding author; Fax: +1 613 520 4497; E-mail: mmccully@ccs.carleton.ca

The elemental composition of xylem sap has been determined by cryo-analytical microscopy in situ along vessels in the roots of maize plants frozen intact while root pressure was high. The only chemical element (including carbon) present in significant concentrations in the vessels was potassium at 11 mM and 15 mM in the late (LMX) and early (EMX) metaxylem, respectively. There was no gradient of [K] along the vessels, which each run the length of the mature proximal end of the roots. At the distal end of each vessel, in the oldest still living vessel, which each run the length of the mature proximal end of the roots. At the distal end of each vessel, in the oldest still living vessel elements, there was sharp rise in [K] to 110 mM and 130 mM in the LMX and EMX, respectively. Keywords: Cryo-analytical microscopy, in situ xylem sap composition, maize roots, root pressure development.
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