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Schematic diagram of elevated CO2 and ABA interaction in stomatal closure. Elevated CO2 and ABA signal transduction merge downstream of OST1/SnRK2.6 to regulate stomatal movements. Elevated CO2 triggers stomatal closure through an ABA-independent pathway. Basal ABA signal transduction and basal OST1/SnRK2.6 kinase activity are, however, required as amplifier and accelerator of elevated CO2-triggered stomatal closure.
