Effects of CPPU Treatment Methods on the Fruit Quality of ‘Shine Muscat’ Grape

Mochida Keisuke, Maki Shinya, Onishi Aki, Uchida Yoshinori, Kurahashi Takao

doi:10.2503/hrj.12.155

The effects of the application timing and concentration of N-(2-chloro-4-pyridyl)-N’-phenylurea (CPPU) on fruit quality of ‘Shine Muscat’ grape were investigated. Spraying the bunch with 2 ppm CPPU before blooming or 10 ppm CPPU application in addition to 25 ppm GA₃ at full bloom significantly improved the tightness of the fruit bunch and decreased pericarp browning. Sensory tests revealed spraying the bunch with 2 ppm CPPU before blooming and 10 ppm CPPU application in addition to 25 ppm GA₃ at full bloom decreased the hardness of the flesh, increased the hardness of the pericarp, and decreased the palatability of the berry. Spraying the bunch with 2 ppm CPPU before blooming and 10 ppm CPPU application in addition to 25 ppm GA₃ at 10–15 days after full bloom markedly increased the hardness of the pericarp. Spraying the bunch with 2 ppm CPPU before blooming significantly increased the thickness of layers of epidermal and subepidermal cells. These results suggest that spraying the bunch with 2 ppm CPPU before blooming, dipping the bunch in a mixed solution of 25 ppm GA₃ and 5 ppm CPPU at full bloom, and dipping the bunch in a solution of 25 ppm GA₃ 10–15 days after full bloom, switching from the standard methods in Shimane prefecture (dipping the bunch in a mixed solution of 25 ppm GA₃ and 3 ppm CPPU at full bloom and dipping the bunch in a solution of 25 ppm GA₃ 10–15 days after full bloom), are effective for improving marketability.<br>

Effects of CPPU Treatment Methods on the Fruit Quality of ‘Shine Muscat’ Grape

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