A comparison of caesium uptake kinetics in eight species of grass

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 perenn...

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Bibliographic Details
Published in:	Journal of environmental radioactivity 1999-01, Vol.46 (2), p.225-236
Main Authors:	Broadley, M.R., Willey, N.J., Philippidis, C., Dennis, E.R.
Format:	Article
Language:	eng
Subjects:	Animal, plant and microbial ecology Applied ecology Biological and medical sciences Caesium Ecotoxicology, biological effects of pollution Effects of pollution and side effects of pesticides on plants and fungi Fundamental and applied biological sciences. Psychology Michaelis–Menten kinetics Non agrochemicals pollutants Phytopathology. Animal pests. Plant and forest protection Plant uptake Pollution effects and side effects of agrochemicals on crop plants and forest trees. Other anthropogenic factors Pollution effects. Side effects of agrochemicals
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Summary:	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 ( r 2=0.53; p=0.03), and a negative relationship between C min and RGR ( r 2=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.
ISSN:	0265-931X 1879-1700