Inhibition of Ion Accumulation in Maize Roots by Abscisic Acid

An inhibition of root growth, a decrease in the amount of potassium (as 86Rb) and phosphate (32P) accumulation by the root, and a partial depolarization of transmembrane electropotential were observed to develop with a similar time course and to a similar extent when intact maize (Zea mays L.) roots...

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Veröffentlicht in:Planta 1975-01, Vol.122 (1), p.79-90
Hauptverfasser: Shaner, Dale L., Mertz, Stuart M., Arntzen, Charles J.
Format: Artikel
Sprache:eng
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Zusammenfassung:An inhibition of root growth, a decrease in the amount of potassium (as 86Rb) and phosphate (32P) accumulation by the root, and a partial depolarization of transmembrane electropotential were observed to develop with a similar time course and to a similar extent when intact maize (Zea mays L.) roots were treated with 10-5 M abscisic acid (ABA). Potassium uptake was inhibited by ABA when excised, low-salt roots were bathed in KCl, KH2PO4, or K2SO4. ABA did not affect the ATP content of the tissues, the activity of isolated mitochondria, nor the activity of microsomal K+-stimulated ATPases.
ISSN:0032-0935
1432-2048
DOI:10.1007/BF00385407