MadSci Network: Botany

Re: where can cs-137 be found in the plants

Date: Sun Nov 20 15:42:36 2005
Posted By: David Hershey, Faculty, Botany, NA
Area of science: Botany
ID: 1131740483.Bt

Cesium is chemically similar to potassium. Potassium is essential to plants.
Cesium is not essential for plants and is toxic at high enough concentrations.
Cesium binds to potassium binding sites on proteins (Hampton et al. 2004). 

Potassium is not incorporated into specific molecules as are many essential
elements such as nitrogen, phosphorus and sulfur. Potassium occurs in plants as
the soluble potassium ion. More potassium occurs in vacuoles than in the
cytosol. In mesophyll cells of wheat leaves, potassium activity was 235 mM in
the vacuole and 79 mM in the cytosol (Cuin et al. 2003). Cesium would be
expected to behave similarly. 

Potassium functions to activate certain enzymes, is required for stomatal
opening and functions as an osmoticum.

Search PubMed or Science Citation Index for more information on cesium and plants.


Hampton, C.R., Bowen, H.C., Broadley, M.R., Hammond, J.P., Mead, A., Payne,
K.A., Pritchard, J. and White, P.J. 2004. Cesium toxicity in Arabidopsis. Plant
Physiology 136:3824-3837.

Cuin, T.A., Miller, A.J.,Laurie, S.A. and Leigh, R.A. 2003. Potassium activities
in cell compartments of salt-grown barley leaves. Journal of Experimental Botany
54: 657-661.

Essential Elements for Plant Growth: Potassium


The importance of potassium to plants

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