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A model for regulating fruit abscission in ornamental crabapple was proposed. The expression of ethylene biosynthesis genes, jasmonic acid biosynthesis genes, abscisic acid biosynthesis genes, and cytokinin biosynthesis genes upregulated in AZ during fruit abscission. Cell wall hydrolase-related genes were also upregulated. Solid arrows indicate known mechanisms; broken arrows indicate unknown mechanisms, and red represents upregulation increase events.
