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Significance The complex and diverse functions of the phytohormone auxin rely on its concentration. A high concentration of auxin has distinct effects on plant development and environmental adaptation in comparison with a low level of auxin. In this study, we show that a high concentration of auxin is capable of stimulating ABA responses partially through a TMK1-based mechanism. This involves the phosphorylation of ABI1/2, two negative regulators of ABA signaling, and following the activation of downstream ABA responses. Our work reveals the interplay between the phytohormone auxin and ABA, and provides a basis for interpreting differential phytohormone responses during plant development.

TMK1-based auxin signaling regulates abscisic acid responses via phosphorylating ABI1/2 in Arabidopsis