Long-distance signalling of abscisic acid (ABA): the factors regulating the intensity of the ABA signal.
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.
Jiang
Fan
F
College of Life Science, BeiJing Normal University, Xin Jie Kou Wai Da Jie 19, 100875 BeiJing, China.
Hartung
Wolfram
W
D000040:Abscisic Acid / Q000378:metabolism*; D010937:Plant Growth Regulators / Q000378:metabolism*; D018517:Plant Roots / Q000378:metabolism; D010944:Plants / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*; D052584:Xylem / Q000378:metabolism*
D010937:Plant Growth Regulators; D000040:Abscisic Acid