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Ethylene and reactive oxygen species are involved in root aerenchyma formation and adaptation of wheat seedlings to oxygen-deficient conditions.

Authors
  • Yamauchi, Takaki
  • Watanabe, Kohtaro
  • Fukazawa, Aya
  • Mori, Hitoshi
  • Abe, Fumitaka
  • Kawaguchi, Kentaro
  • Oyanagi, Atsushi
  • Nakazono, Mikio
Type
Published Article
Journal
Journal of Experimental Botany
Publisher
Oxford University Press
Publication Date
Jan 01, 2014
Volume
65
Issue
1
Pages
261–273
Identifiers
DOI: 10.1093/jxb/ert371
PMID: 24253196
Source
Medline
Keywords
License
Unknown

Abstract

Exposing plants to hypoxic conditions greatly improves their anoxic stress tolerance by enhancing the activities of glycolysis and fermentation in roots. Ethylene may also be involved in these adaptive responses because its synthesis is increased in roots under hypoxic conditions. Here it is reported that pre-treatment of wheat seedlings with an ethylene precursor, 1-aminocyclopropanecarboxylic acid (ACC), enhanced accumulation of ethylene in the roots of wheat seedlings, and enhanced their tolerance of oxygen-deficient conditions through increasing the expression of genes encoding ethanol fermentation enzymes, alcohol dehydrogenase and pyruvate decarboxylase, in the roots. Lysigenous aerenchyma formation in root was induced by ACC pre-treatment and was further induced by growth under oxygen-deficient conditions. ACC pre-treatment increased the expression of three genes encoding respiratory burst oxidase homologue (a plant homologue of gp91(phox) in NADPH oxidase), which has a role in the generation of reactive oxygen species (ROS), in roots of seedlings. Co-treatment with ACC and an NADPH oxidase inhibitor, diphenyleneiodonium, partly suppressed the ACC-induced responses. These results suggest that ethylene and ROS are involved in adaptation of wheat seedlings to oxygen-deficient conditions through controlling lysigenous aerenchyma formation and the expression of genes encoding ethanol fermentation enzymes.

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