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Fruit softening is an ethylene-dependent ripening event. 1-Methylcyclopropene (1-MCP), a synthetic plant growth regulator structurally related to the natural plant hormone ethylene, is used to slow down the fruit ripening. However, inappropriate 1-MCP treatment tends to cause the elastic texture in papaya fruit. Constitutive triple response 1 (CTR1), a downstream protein of the ethylene receptors,...