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. 1988 May;87(1):176-8.
doi: 10.1104/pp.87.1.176.

Effect of Exogenous Putrescine, Spermidine, and Spermine on K Uptake and H Extrusion through Plasmamembrane in Maize Root Segments

M de Agazio  1 , M C Giardina, S Grego
Affiliations

Effect of Exogenous Putrescine, Spermidine, and Spermine on K Uptake and H Extrusion through Plasmamembrane in Maize Root Segments

M de Agazio et al. Plant Physiol. 1988 May.

Abstract

The action of exogenous polyamines (putrescine, spermidine, and spermine) on ;washing' and fusicoccin-stimulated K(+) uptake and H(+) extrusion through the plasmamembrane in maize (Zea mays L., hybrid line Plenus S 516) root apical segments was studied. The results showed that polyamines inhibit the washing-stimulated K(+) influx and H(+) extrusion without interfering with K(+) uptake and H(+) extrusion stimulated by fusicoccin. Spermidine appeared to be the most effective in inhibiting K(+) uptake and H(+) extrusion while putrescine showed a smaller inhibiting action with respect to the others. The analysis of kinetic constants indicated that the polyamines behave as competitive inhibitors with respect to K(+).

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References

    1. Plant Physiol. 1982 Dec;70(6):1597-600 - PubMed
    1. Plant Physiol. 1972 Mar;49(3):430-5 - PubMed
    1. Plant Physiol. 1985;79:336-43 - PubMed
    1. Plant Physiol. 1979 Nov;64(5):721-6 - PubMed
    1. Plant Physiol. 1982 Feb;69(2):405-10 - PubMed

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