Effect of Foliar Spray of Calcium Hydroxide on the Structural Characteristics of Pericarp and Berry Cracking in 'Kyoho' Grapes (Vitis. Sp.)
2010
Son, I.C., Chungbuk National University, Cheongju, Republic of Korea | Shin, H.S., Chungbuk National University, Cheongju, Republic of Korea | Oh, S.I., Chungbuk National University, Cheongju, Republic of Korea | Park, S.J., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Park, K.S., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Kim, D.I., Chungbuk National University, Cheongju, Republic of Korea
Berry cracking is one of the most serious problems in 'Kyoho' grape cultivation. To reduce the berry cracking, different concentrations (0, 15, 30, 45 gㆍL-¹) of calcium hydroxide (Ca(OH₂)) were sprayed twice times at 4 and 8 weeks after full bloom day. Except the soluble solid content which increased in higher concentration of Ca(OH₂) treatment, most characters of harvested grapes including cluster weight, berry weight, acidity, and anthocyanin content were not different significantly among treatments. Higher concentration of Ca(OH₂) also showed increasing tendency of berry firmness in 'Kyoho' grape. Depending on different Ca(OH₂) concentration of 15, 30 and 45 gㆍL-¹, thickness of epidermal cell was increased to 3.42, 3.65 and 3.60 ㎛, and thickness of sub-epidermal cell was also remarkably increased to 4.69, 5.18 and 5.38 ㎛ respectively compared with controlled of 3.12 and 4.60 ㎛. Structural increase of epidermal and sub-epidermal cell wall thickness was effective for firmness of pericarp and berry cracking reduction in 'Kyoho' grape.
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