Activation of γ-Aminobutyrate Production by Chloroplastic H2O2 Is Associated with the Oxidative Stress Response

Takanori MARUTA; Megumi OJIRI; Masahiro NOSHI; Masahiro TAMOI; Takahiro ISHIKAWA; Shigeru SHIGEOKA

doi:10.1271/bbb.120825

Biochemistry & Molecular Biology Notes

Activation of γ-Aminobutyrate Production by Chloroplastic H₂O₂ Is Associated with the Oxidative Stress Response

Takanori MARUTA, Megumi OJIRI, Masahiro NOSHI, Masahiro TAMOI, Takahiro ISHIKAWA, Shigeru SHIGEOKA

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Keywords: reactive oxygen species, oxidative stress, γ-aminobutyrate, chloroplast, Arabidopsis

JOURNAL FREE ACCESS

2013 Volume 77 Issue 2 Pages 422-425

DOI https://doi.org/10.1271/bbb.120825

View "Advance Publication" version (February 7, 2013).

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Abstract

We isolated an Arabidopsis knockout line lacking glutamate decarboxylase 1 (GAD1), one that produced γ-aminobutyrate (GABA), as an oxidative stress-insensitive mutant, and found that chloroplastic H₂O₂ enhances GAD1 expression and GABA levels. This suggests a possible relationship between GABA metabolism and the chloroplastic H₂O₂-mediated stress response.

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