To Stimulate or Inhibit? That Is the Question for the Function of Abscisic Acid.

Jan F Humplík, Véronique Bergougnoux, Elizabeth Van Volkenburgh

Journal: Trends in plant science 2018;22(10):830-841

PMID: 28843765

Full Text on Elsevier Science View on PubMed

Abstract

Physiologically, abscisic acid (ABA) is believed to be a general inhibitor of plant growth, including during the crucial early development of seedlings. However, this view contradicts many reports of stimulatory effects of ABA that, so far, have not been considered in the debate concerning ABA's function in plant development. To address this apparent contradiction, we propose a hypothetical mechanism to explain how ABA might contribute to the promotion of cell expansion. We wish to overturn conventional views on ABA's role during juvenile plant development and put forward the idea that, as for other phytohormones, the role of ABA is determined by dose and sensitivity and ranges from stimulatory to inhibitory effects.

Address: Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany Czech Academy of Sciences and Palacký University Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic; Department of Chemical Biology and Genetics, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic; These authors contributed equally to the work. Electronic address: [email protected].; Department of Molecular Biology, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic; These authors contributed equally to the work.; Department of Biology, University of Washington, Seattle, WA, USA.

DOI: 10.1016/j.tplants.2017.07.009

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MeSH Terms: Abscisic Acid, Plant Development, Plant Growth Regulators, Seedlings