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2015 ; 4
(3
): 548-72
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Abscisic Acid: Hidden Architect of Root System Structure
#MMPMID27135341
Harris JM
Plants (Basel)
2015[Aug]; 4
(3
): 548-72
PMID27135341
show ga
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.