Long‐term effects of abscisic acid on K+ transport in young wheat plants of different K+ status

Min Raj Dhakal, L. Erdei

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The effects of abscisic acid (ABA) on growth, uptake and translocation of potassium ions, K+,Mg2+‐ATPase activity and transpiration were investigated in young wheat (Triticum aestivum L. cv. Martonvásári‐8) plants grown at different K+ supplies. Long‐term treatment with ABA (10 μM) reduced growth in high‐K+ plants, but had less effect under low‐K+ conditions. K+(86Rb) uptake was inhibited by about 70 and 40% in low‐ and high‐K+ plants, respectively. The stimulation by K+ of the Mg2+‐ATPase activity in the root microsomal fraction was lost with ABA treatment. It is suggested that the inhibitory effect of ABA on K+ uptake may be related to this effects on the K+,Mg2+‐ATPase. Translocation of K+ to the shoot was inhibited in low‐K+ plants only, and it was not affected in high‐K+ plants. In parallel to this, ABA treatment reduced transpiration by about 50% in low‐K+ plants, whereas a much smaller effect was seen in high‐K+ plants. These observations suggest that the regulation by ABA of the stomatal movements is strongly counteracted by high‐K+ status.

Original languageEnglish
Pages (from-to)637-640
Number of pages4
JournalPhysiologia Plantarum
Volume68
Issue number4
DOIs
Publication statusPublished - Jan 1 1986

Keywords

  • K
  • Mg‐ATPase
  • translocation of K
  • Transpiration
  • Triticum aestivum
  • uptake of K

ASJC Scopus subject areas

  • Physiology
  • Genetics
  • Plant Science
  • Cell Biology

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