Plant Physiol. Drug Metab Dispos
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Plant Physiology 67:445-448 (1981)
© 1981 American Society of Plant Biologists

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Articles

Sulfate Transport in Cultured Tobacco Cells 1

EFFECTS OF CALCIUM AND SULFATE CONCENTRATION

Susan L. Jones and Ivan K. Smith

Department of Botany, Ohio University, Athens, Ohio 45701

Sulfate transport by tobacco cells (var. Xanthi) cultured in liquid medium was investigated. Monophasic uptake was observed over a sulfate concentration range from 0.01 to 10 millimolar, and the Km was 20 micromolar. A time-dependent stimulation of transport was observed when cells were incubated in medium containing 0.5 millimolar Ca2+. Calcium stimulation was dependent on the culture cycle and was maximal during the early exponential phase. It was not observed in sulfur-deficient cells with high transport rates and was relatively small in sulfate-loaded cells with low transport rates. A kinetic analysis showed that Ca2+ increased the maximum rate of transport without affecting the Km.

1 This research was supported by the Science and Education Administration of the United States Department of Agriculture under Grant 5901-0410-8-0057-0 from the Competitive Research Grants Office.






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Copyright © 1981 by the American Society of Plant Biologists