Long-distance signalling of abscisic acid (ABA): The factors regulating the intensity of the ABA signal

  • Jiang F
  • Hartung W
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Abstract

Abscisic acid (ABA) is a stress signal, which moves in the xylem from the roots to the aerial parts of the plant, where it regulates stomatal movement and the activity of shoot meristems. Root growth-promoting microorganisms in the rhizosphere, lateral ABA flows in the root cortex across apoplastic barriers, ABA redistribution in the stem, leaf apoplastic pH values, and the action of beta-glucosidases, both in the apoplast and the cytosol of the mesophyll, play an important role in the regulation of signal intensity. The significance of abscisic acid glucose ester as a long-distance stress signal is discussed.

Author-supplied keywords

  • Abscisic acid glucose ester
  • Apoplast
  • Rhizosphere
  • Xylem
  • pH
  • β-glucosidases

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Authors

  • Fan Jiang

  • Wolfram Hartung

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