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Open AccessArticle

A Role for Auxin in Ethylene-Dependent Inducible Aerenchyma Formation in Rice Roots

1
Japan Science and Technology Agency, PRESTO, Kawaguchi, Saitama 332-0012, Japan
2
Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan
3
Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Aichi 464–8601, Japan
4
International Center for Research and Education in Agriculture, Nagoya University, Nagoya, Aichi 464–8601, Japan
5
The UWA School of Agriculture and Environment, Faculty of Science, The University of Western Australia, Crawley, WA 6009, Australia
*
Authors to whom correspondence should be addressed.
Plants 2020, 9(5), 610; https://doi.org/10.3390/plants9050610
Received: 24 April 2020 / Revised: 8 May 2020 / Accepted: 8 May 2020 / Published: 11 May 2020
(This article belongs to the Special Issue Plant Responses to Hypoxia)
Internal oxygen diffusion from shoot to root tips is enhanced by the formation of aerenchyma (gas space) in waterlogged soils. Lysigenous aerenchyma is created by programmed cell death and subsequent lysis of the root cortical cells. Rice (Oryza sativa) forms aerenchyma constitutively under aerobic conditions and increases its formation under oxygen-deficient conditions. Recently, we have demonstrated that constitutive aerenchyma formation is regulated by auxin signaling mediated by Auxin/indole-3-acetic acid protein (AUX/IAA; IAA). While ethylene is involved in inducible aerenchyma formation, the relationship of auxin and ethylene during aerenchyma formation remains unclear. Here, we examined the effects of oxygen deficiency and ethylene on aerenchyma formation in the roots of a rice mutant (iaa13) in which auxin signaling is suppressed by a mutation in the degradation domain of IAA13 protein. The results showed that AUX/IAA-mediated auxin signaling contributes to ethylene-dependent inducible aerenchyma formation in rice roots. An auxin transport inhibitor abolished aerenchyma formation under oxygen-deficient conditions and reduced the expression of genes encoding ethylene biosynthesis enzymes, further supporting the idea that auxin is involved in ethylene-dependent inducible aerenchyma formation. Based on these studies, we propose a mechanism that underlies the relationship between auxin and ethylene during inducible aerenchyma formation in rice roots. View Full-Text
Keywords: aerenchyma; auxin; ethylene; rice (Oryza sativa); root; waterlogging aerenchyma; auxin; ethylene; rice (Oryza sativa); root; waterlogging
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MDPI and ACS Style

Yamauchi, T.; Tanaka, A.; Tsutsumi, N.; Inukai, Y.; Nakazono, M. A Role for Auxin in Ethylene-Dependent Inducible Aerenchyma Formation in Rice Roots. Plants 2020, 9, 610. https://doi.org/10.3390/plants9050610

AMA Style

Yamauchi T, Tanaka A, Tsutsumi N, Inukai Y, Nakazono M. A Role for Auxin in Ethylene-Dependent Inducible Aerenchyma Formation in Rice Roots. Plants. 2020; 9(5):610. https://doi.org/10.3390/plants9050610

Chicago/Turabian Style

Yamauchi, Takaki; Tanaka, Akihiro; Tsutsumi, Nobuhiro; Inukai, Yoshiaki; Nakazono, Mikio. 2020. "A Role for Auxin in Ethylene-Dependent Inducible Aerenchyma Formation in Rice Roots" Plants 9, no. 5: 610. https://doi.org/10.3390/plants9050610

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