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Science 15 February 1974:
Vol. 183. no. 4125, pp. 670 - 671
DOI: 10.1126/science.183.4125.670
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Articles

The Casparian Strip as a Barrier to the Movement of Lanthanum in Corn Roots

G. Nagahashi 1, W. W. Thomson 1, and R. T. Leonard 2

1 Department of Biological Sciences, University of California, Riverside 92502
2 Department of Plant Sciences, University of California, Riverside

The effectiveness of the Casparian strip as a barrier to apoplastic movement of solutes from cortex to stele of corn roots was investigated by using lanthanum in combination with electron microscopy. Lanthanum deposits were found only in cell walls and on the outside of the plasma membrane of epidermal, cortical, and endodermal cells up to the Casparian strip. Lanthanum was completely absent from the stele, indicating that the Casparian strip provides an effective barrier to apoplastic movement of solutes. Inhibitory effects of trivalent lanthanum ions on the absorption of potassium ions are discussed in relation to the nature of the lanthanum ion binding site on membranes.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Casparian Strips in Needles are More Solute Permeable than Endodermal Transport Barriers in Roots of Pinus bungeana.
X. Wu, J. Lin, Q. Lin, J. Wang, and L. Schreiber (2005)
Plant Cell Physiol. 46, 1799-1808
   Abstract »    Full Text »    PDF »
Can Ca2+ Fluxes to the Root Xylem Be Sustained by Ca2+-ATPases in Exodermal and Endodermal Plasma Membranes?.
M. L. Hayter and C. A. Peterson (2004)
Plant Physiology 136, 4318-4325
   Abstract »    Full Text »    PDF »
Partitioning of nutrient transport processes in roots.
M. Tester and R. A. Leigh (2001)
J. Exp. Bot. 52, 445-457
   Abstract »    Full Text »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)