Cadmium alteration of root physiology and potassium ion fluxes.
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Journal: 2010/June - Plant Physiology
ISSN: 0032-0889
PUBMED: 16660477
Abstract:
Segments of oat (Avena sativa L.) roots which had been exposed to 1 millimolar CdSO(4) in quarter-strength Hoagland No. 1 solution exhibited decreased respiratory rates, ATP levels, membrane-bound ATPase activity, and reduced K(+) fluxes. Respiration and ATP levels were decreased after a 2-hour treatment with 1 millimolar CdSO(4) to 65 and 75%, respectively, of control rates. A membrane-bound, Mg(2+)-dependent, K(+)-stimulated acid ATPase was rapidly inhibited to 12% of control activity in the presence of 1 millimolar CdSO(4). Potassium uptake into root segments was inhibited to 80% of control values after 30 minutes in the presence of CdSO(4). A 2-hour pretreatment of root segments with CdSO(4) inhibited K(+) uptake to 15% of control values. Cytoplasmic K(+) efflux was inhibited with 1 millimolar CdSO(4).The rates and the degree of Cd(2+) inhibition of the parameters listed above suggest that one of the first sites of Cd(2+) action is the plasmalemma K(+) carrier (ATPase) in oat roots.
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Plant Physiol 62(1): 94-96
PMID: 16660477

Cadmium Alteration of Root Physiology and Potassium Ion Fluxes <sup><a href="#fn1" rid="fn1" class=" fn">1</a></sup>

Abstract

Segments of oat (Avena sativa L.) roots which had been exposed to 1 millimolar CdSO4 in quarter-strength Hoagland No. 1 solution exhibited decreased respiratory rates, ATP levels, membrane-bound ATPase activity, and reduced K fluxes. Respiration and ATP levels were decreased after a 2-hour treatment with 1 millimolar CdSO4 to 65 and 75%, respectively, of control rates. A membrane-bound, Mg-dependent, K-stimulated acid ATPase was rapidly inhibited to 12% of control activity in the presence of 1 millimolar CdSO4. Potassium uptake into root segments was inhibited to 80% of control values after 30 minutes in the presence of CdSO4. A 2-hour pretreatment of root segments with CdSO4 inhibited K uptake to 15% of control values. Cytoplasmic K efflux was inhibited with 1 millimolar CdSO4.

The rates and the degree of Cd inhibition of the parameters listed above suggest that one of the first sites of Cd action is the plasmalemma K carrier (ATPase) in oat roots.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
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Department of Biology, Indiana University-Purdue University at Indianapolis, 1201 East 38th Street, Indianapolis, Indiana 46205
This work was supported through Public Health Service Grant SO5 RR 7031 made to Indiana University under the Biomedical Research Support Grant Program.
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Abstract
Segments of oat (Avena sativa L.) roots which had been exposed to 1 millimolar CdSO4 in quarter-strength Hoagland No. 1 solution exhibited decreased respiratory rates, ATP levels, membrane-bound ATPase activity, and reduced K fluxes. Respiration and ATP levels were decreased after a 2-hour treatment with 1 millimolar CdSO4 to 65 and 75%, respectively, of control rates. A membrane-bound, Mg-dependent, K-stimulated acid ATPase was rapidly inhibited to 12% of control activity in the presence of 1 millimolar CdSO4. Potassium uptake into root segments was inhibited to 80% of control values after 30 minutes in the presence of CdSO4. A 2-hour pretreatment of root segments with CdSO4 inhibited K uptake to 15% of control values. Cytoplasmic K efflux was inhibited with 1 millimolar CdSO4.The rates and the degree of Cd inhibition of the parameters listed above suggest that one of the first sites of Cd action is the plasmalemma K carrier (ATPase) in oat roots.
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