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Plants 2015, 4(3), 548-572;

Abscisic Acid: Hidden Architect of Root System Structure

Department of Plant Biology, University of Vermont, Burlington, VT 05401, USA
Academic Editor: Rujin Chen
Received: 6 July 2015 / Revised: 1 August 2015 / Accepted: 3 August 2015 / Published: 11 August 2015
(This article belongs to the Special Issue Plant Root Development)
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Plants modulate root growth in response to changes in the local environment, guided by intrinsic developmental genetic programs. The hormone Abscisic Acid (ABA) mediates responses to different environmental factors, such as the presence of nitrate in the soil, water stress and salt, shaping the structure of the root system by regulating the production of lateral roots as well as controlling root elongation by modulating cell division and elongation. Curiously, ABA controls different aspects of root architecture in different plant species, perhaps providing some insight into the great diversity of root architecture in different plants, both from different taxa and from different environments. ABA is an ancient signaling pathway, acquired well before the diversification of land plants. Nonetheless, how this ancient signaling module is implemented or interacts within a larger signaling network appears to vary in different species. This review will examine the role of ABA in the control of root architecture, focusing on the regulation of lateral root formation in three plant species, Arabidopsis thaliana, Medicago truncatula and Oryza sativa. We will consider how the implementation of the ABA signaling module might be a target of natural selection, to help contribute to the diversity of root architecture in nature. View Full-Text
Keywords: abscisic acid (ABA); root; meristem; development; lateral root; root architecture; developmental plasticity abscisic acid (ABA); root; meristem; development; lateral root; root architecture; developmental plasticity

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Harris, J.M. Abscisic Acid: Hidden Architect of Root System Structure. Plants 2015, 4, 548-572.

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