Effects of organic acids on the formation of the barrier to radial oxygen loss in roots of Hordeum marinum
Lukasz Kotula A B D , Timothy David Colmer B C and Mikio Nakazono A
+ Author Affiliations
- Author Affiliations
A Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan.
B School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
C Institute of Agriculture, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
D Corresponding author. Email: lukasz.kotula@uwa.edu.au
Functional Plant Biology 41(2) 187-202 https://doi.org/10.1071/FP13178
Submitted: 10 June 2013 Accepted: 12 August 2013 Published: 24 October 2013
Abstract
A barrier to radial O2 loss (ROL) is an adaptive trait of many wetland plants, yet the signal(s) for barrier induction remain uncertain. We assessed the effects of monocarboxylic acids produced in waterlogged soils (acetic, propionic, N-butyric and caproic acids) on barrier formation in adventitious roots of the waterlogging tolerant Hordeum marinum Huds. These acids were applied in nutrient solution either individually (at 0.4 mM) or as a mixture (‘cocktail’) at various total concentrations (0.1, 0.4 and 2 mM) at pH 6. The barrier to ROL was formed in basal zones of roots exposed to the cocktail at 0.4 mM, but not at 0.1 mM. Individually, only N-butyric and caproic acids invoked a ‘tight’ barrier in subapical positions of the roots. These organic acids accelerated deposition of suberin in the hypodermis/exodermis, but did not affect overall root porosity (% gas space). The organic acids also reduced root extension rate and tissue K+; effects were more pronounced at higher concentrations of the cocktail and as the molecular weight of the organic acid increased. Moreover, the cocktail at 2 mM and caproic acid at 0.4 mM alone induced development of intercellular occlusions, suggesting phytotoxin injury. In summary, even relatively low concentrations of organic acids can promote barrier formation in roots, and the potential toxicity of these compounds was demonstrated by declines in root growth and tissue K+ in the wetland species H. marinum.
Additional keywords: adventitious roots, aerenchyma, apoplastic barrier, root potassium, suberin, waterlogging tolerance.
References
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