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MdMYB9 is a positive regulator for the biosynthesis of anthocyanin and proanthocyanidin in apple.However, it is unclear about its posttranslational regulation.Here, we demonstrated that BTB protein MdBT2 acted as a negative role in the biosynthesis of anthocyanin and proanthocyanidin.MdBT2 interacted with MdMYB9 and negatively regulated the abundance of MdMYB9 protein via the 26S-proteasome system.