A comparison of caesium uptake kinetics in eight species of grass

Broadley, M. R.; Willey, N. J.; Philippidis, C.; Dennis, E. R.; Willey, Neil

Abstract

The Michaelis-Menten kinetic parameters (I(max) K(m) and C(min)) of CS uptake were estimated using a solution-depletion method, after 0, 1 and 4 d K-starvation in eight mature grass species of different relative growth rates (Bromus sterilis L., Elymus repens (L.) Gould, Poa annua L., Lolium perenne L. var. 'Taya', Anthoxanthum odoratum L., Festuca gigantea (L.) Vill., Festuca ovina L. and Nardus stricta L.). There were species differences in I(max) and C(min), a positive relationship between K(m) and RGR (r2 = 0.53; p = 0.03), and a negative relationship between C(min) and RGR (r2 = 0.89; p = 0.001) in 0 d K starved plants. In general, I (max) increased with K starvation, as previously reported for K uptake kinetics. K(m) increased with K starvation, contrasting with reported studies on K, and C(min) decreased, although all species did not respond similarly.

• Journal Article Type: Article
• Publication Date: Jan 1, 1999
• Deposit Date: Feb 9, 2015
• Journal: Journal of Environmental Radioactivity
• Print ISSN: 0265-931X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 46
• Issue: 2
• Pages: 225-236
• DOI: https://doi.org/10.1016/S0265-931X%2898%2900128-3
• Keywords: caesium, plant uptake, michaelis–menten kinetics
• Public URL: https://uwe-repository.worktribe.com/output/1096271
• Publisher URL: http://dx.doi.org/10.1016/S0265-931X(98)00128-3
• Contract Date: Nov 15, 2016