Rice acclimation to soil flooding: low concentrations of organic acids can trigger a barrier to radial oxygen loss in roots
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Rice acclimation to soil flooding : low concentrations of organic acids can trigger a barrier to radial oxygen loss in roots. / Colmer, Timothy David; Kotula, Lukasz; Malik, Al Imran; Takahashi, Hirokazu; Konnerup, Dennis; Nakazono, Mikio; Pedersen, Ole.
I: Plant, Cell and Environment, Bind 42, Nr. 7, 2019, s. 2183-2197.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Rice acclimation to soil flooding
T2 - low concentrations of organic acids can trigger a barrier to radial oxygen loss in roots
AU - Colmer, Timothy David
AU - Kotula, Lukasz
AU - Malik, Al Imran
AU - Takahashi, Hirokazu
AU - Konnerup, Dennis
AU - Nakazono, Mikio
AU - Pedersen, Ole
N1 - This article is protected by copyright. All rights reserved.
PY - 2019
Y1 - 2019
N2 - Waterlogged soils contain monocarboxylic acids produced by anaerobic microorganisms. These 'organic acids' can accumulate to phytotoxic levels and promote development of a barrier to radial O2 loss (ROL) in roots of some wetland species. Environmental cues triggering root ROL barrier induction, a feature which together with tissue gas-filled porosity facilitates internal aeration, are important to elucidate for knowledge of plant stress physiology. We tested the hypothesis that comparatively low, non-toxic, concentrations of acetic, propionic, butyric and/or hexanoic acids might induce root ROL barrier formation in rice. Each organic acid, individually, triggered the ROL barrier in roots, but with no effect (acetic or butyric acids) or with only slight effects (propionic or hexanoic acids) on root extension. Transcripts of four genes related to suberin biosynthesis were increased by some of the organic acid treatments. Respiration in root tissues was not, or moderately, inhibited. Beyond a narrow concentration range, however, respiration declined exponentially and the order (least to greatest) for EC50 (effective concentration for 50% inhibition) was butyric, propionic, acetic, then hexanoic acid. An understanding of the environmental cue for root ROL barrier induction should enhance future work to elucidate the molecular regulation of this root trait contributing to plant flooding tolerance.
AB - Waterlogged soils contain monocarboxylic acids produced by anaerobic microorganisms. These 'organic acids' can accumulate to phytotoxic levels and promote development of a barrier to radial O2 loss (ROL) in roots of some wetland species. Environmental cues triggering root ROL barrier induction, a feature which together with tissue gas-filled porosity facilitates internal aeration, are important to elucidate for knowledge of plant stress physiology. We tested the hypothesis that comparatively low, non-toxic, concentrations of acetic, propionic, butyric and/or hexanoic acids might induce root ROL barrier formation in rice. Each organic acid, individually, triggered the ROL barrier in roots, but with no effect (acetic or butyric acids) or with only slight effects (propionic or hexanoic acids) on root extension. Transcripts of four genes related to suberin biosynthesis were increased by some of the organic acid treatments. Respiration in root tissues was not, or moderately, inhibited. Beyond a narrow concentration range, however, respiration declined exponentially and the order (least to greatest) for EC50 (effective concentration for 50% inhibition) was butyric, propionic, acetic, then hexanoic acid. An understanding of the environmental cue for root ROL barrier induction should enhance future work to elucidate the molecular regulation of this root trait contributing to plant flooding tolerance.
U2 - 10.1111/pce.13562
DO - 10.1111/pce.13562
M3 - Journal article
C2 - 30989660
VL - 42
SP - 2183
EP - 2197
JO - Plant, Cell and Environment
JF - Plant, Cell and Environment
SN - 0140-7791
IS - 7
ER -
ID: 216910403