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• W2891405963 abstract "Respiration in leaves and the continued elevation in the atmospheric CO2 concentration cause CO2 -mediated reduction in stomatal pore apertures. Several mutants have been isolated for which stomatal responses to both abscisic acid (ABA) and CO2 are simultaneously defective. However, there are only few mutations that impair the stomatal response to elevated CO2 , but not to ABA. Such mutants are invaluable in unraveling the molecular mechanisms of early CO2 signal transduction in guard cells. Recently, mutations in the mitogen-activated protein (MAP) kinase, MPK12, have been shown to partially impair CO2 -induced stomatal closure. Here, we show that mpk12 plants, in which MPK4 is stably silenced specifically in guard cells (mpk12 mpk4GC homozygous double-mutants), completely lack CO2 -induced stomatal responses and have impaired activation of guard cell S-type anion channels in response to elevated CO2 /bicarbonate. However, ABA-induced stomatal closure, S-type anion channel activation and ABA-induced marker gene expression remain intact in the mpk12 mpk4GC double-mutants. These findings suggest that MPK12 and MPK4 act very early in CO2 signaling, upstream of, or parallel to the convergence of CO2 and ABA signal transduction. The activities of MPK4 and MPK12 protein kinases were not directly modulated by CO2 /bicarbonate in vitro, suggesting that they are not direct CO2 /bicarbonate sensors. Further data indicate that MPK4 and MPK12 have distinguishable roles in Arabidopsis and that the previously suggested role of RHC1 in stomatal CO2 signaling is minor, whereas MPK4 and MPK12 act as key components of early stomatal CO2 signal transduction." @default.
• W2891405963 created "2018-09-27" @default.
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• W2891405963 date "2018-10-23" @default.
• W2891405963 modified "2023-10-10" @default.
• W2891405963 title "Mitogen-activated protein kinases MPK4 and MPK12 are key components mediating CO₂ -induced stomatal movements" @default.
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• W2891405963 doi "https://doi.org/10.1111/tpj.14087" @default.
• W2891405963 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6261798" @default.
• W2891405963 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30203878" @default.
• W2891405963 hasPublicationYear "2018" @default.
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