Inhibitory Effects of Methylglyoxal on Light-Induced Stomatal Opening and Inward K+ Channel Activity in Arabidopsis

Tahsina Sharmin HOQUE; Eiji OKUMA; Misugi URAJI; Takuya FURUICHI; Takayuki SASAKI; Md. Anamul HOQUE; Yoshimasa NAKAMURA; Yoshiyuki MURATA

doi:10.1271/bbb.110885

Biochemistry & Molecular Biology Notes

Inhibitory Effects of Methylglyoxal on Light-Induced Stomatal Opening and Inward K⁺ Channel Activity in Arabidopsis

Tahsina Sharmin HOQUE, Eiji OKUMA, Misugi URAJI, Takuya FURUICHI, Takayuki SASAKI, Md. Anamul HOQUE, Yoshimasa NAKAMURA, Yoshiyuki MURATA

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Keywords: methylglyoxal, stomatal opening, inward-rectifying potassium channel, KAT1, Arabidopsis

JOURNAL FREE ACCESS

2012 Volume 76 Issue 3 Pages 617-619

DOI https://doi.org/10.1271/bbb.110885

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Abstract

Methylglyoxal (MG) is a reactive aldehyde derived by glycolysis. In Arabidopsis, MG inhibited light-induced stomatal opening in a dose-dependent manner. It significantly inhibited both inward-rectifying potassium (K_in) channels in guard-cell protoplasts and an Arabidopsis K_in channel, KAT1, heterologously expressed in Xenopus oocytes. Thus it appears that MG inhibition of stomatal opening involves MG inhibition of K⁺ influx into guard cells.

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