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J Exp Bot. 2008;59(1):37-43. Epub 2007 Jun 26.

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

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  • 1College of Life Science, BeiJing Normal University, Xin Jie Kou Wai Da Jie 19, 100875 BeiJing, China.


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.

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