Abstract
Methyl jasmonate (MeJA) as well as abscisic acid (ABA) induces stomatal closure with their signal crosstalk. We investigated the function of a regulatory A subunit of protein phosphatase 2A, RCN1, in MeJA signaling. Both MeJA and ABA failed to induce stomatal closure in Arabidopsis rcn1 knockout mutants unlike in wild-type plants. Neither MeJA nor ABA induced reactive oxygen species (ROS) production and suppressed inward-rectifying potassium channel activities in rcn1 mutants but not in wild-type plants. These results suggest that RCN1 functions upstream of ROS production and downstream of the branch point of MeJA signaling and ABA signaling in Arabidopsis guard cells.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Abscisic Acid / metabolism*
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Acetates / metabolism*
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Arabidopsis / genetics
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Arabidopsis / metabolism*
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Arabidopsis Proteins / genetics
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Arabidopsis Proteins / metabolism*
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Cyclopentanes / metabolism*
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Okadaic Acid / pharmacology
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Oxylipins / metabolism*
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Plant Stomata / drug effects
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Plant Stomata / metabolism
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Potassium Channels, Inwardly Rectifying / metabolism
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Protein Phosphatase 2 / genetics
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Protein Phosphatase 2 / metabolism*
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Reactive Oxygen Species / metabolism
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Signal Transduction*
Substances
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Acetates
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Arabidopsis Proteins
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Cyclopentanes
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Oxylipins
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Potassium Channels, Inwardly Rectifying
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Reactive Oxygen Species
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Okadaic Acid
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Abscisic Acid
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methyl jasmonate
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Protein Phosphatase 2
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RCN1 protein, Arabidopsis