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The long-distance ABA signal : the fate of the hormone on its way from the root to the shoot.

Research output: Contribution to journalJournal article

Published

Journal publication date10/2001
JournalJournal of Experimental Botany
Journal number363
Volume52
Number of pages8
Pages1991-1998
Original languageEnglish

Abstract

Abscisic acid (ABA) is a potent molecule that certainly modifies stomatal behaviour and plant water loss and probably acts to modify the growth of leaves. The hormone is synthesized both in the leaves and the roots of the plant and in the soil and may move freely from plant to soil and soil to plant. It can also move rapidly through the plant in both the xylem and the phloem and will partition between different compartments in different tissues largely as a function of pH. It is described here how perturbations in soil conditions around the roots and the water status of the air can modify the fluxes of ABA around the plant and its accumulation in different compartments and different tissues. These fluxes can be interpreted as signals of different stresses imposed on the plant and consideration is given to how different perturbations can exert subtle changes which are manifest as modified shoot growth rates and functioning. Most emphasis in the discussion is placed upon the plant's responses to the imposition of soil and atmospheric drought.

Bibliographic note

ABA, stress, nutrient deficiency, xylem and phloem transport.