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Plant Physiology 75:466-473 (1984)
© 1984 American Society of Plant Biologists

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Sulfate Uptake and Its Regulation in Lemna paucicostata Hegelm. 6746

Anne H. Datko1 and S. Harvey Mudd

Laboratory of General and Comparative Biochemistry, National Institute of Mental Health, Bethesda, Maryland 20205

The results of studies of SO42– uptake by Lemna paucicostata are most simply interpreted by the hypothesis that at least two components are involved, one saturating and one linear, `nonsaturating.' The saturating component has a low Km and high specificity for SO42–. Uptake by the nonsaturating component is less affected by pH and temperature than is that of the saturating system. SO42– efflux is not quantitatively important in Lemna under standard conditions (20 micromolar SO42–) (Datko AH, SH Mudd 1980 Plant Physiol 65: 906-912). 55% of newly taken up 35SO42– enters a slowly turning over compartment (vacuole?); 45% remains in a compartment (cytoplasm?) in which it is rapidly metabolized to organic compounds.

Growth in increased concentrations of SO42– or cystine, but not methionine, down-regulates the saturating, but not the nonsaturating, system. Growth in limiting SO42– up-regulates the saturating system. Overall, a 500-fold change was observed. Reciprocal inhibition experiments demonstrated that molybdate and SO42– are taken up by a common mechanism, but growth in molybdate failed to up-regulate SO42– uptake. Regulation by growth in SO42– or cystine did not markedly affect uptake of phosphate or of several organic compounds.

The saturating system contributes 99% of SO42– uptake under standard conditions, providing sufficient SO42– so it is not limiting. In nature the same system likely contributes at least 65 to 70%.

1 Mailing address: Building 32, Room 101, National Institute of Mental Health, Bethesda, MD 20205.




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