カキ'西条'における環状剥皮,摘葉,湛水処理が果実の樹上および収穫後軟化に及ぼす影響(栽培管理・作型)  [in Japanese] Effects of Girdling, Defoliation and Flooding Treatments on Fruit Softening before and after Harvest in 'Saijo' Persimmon (Diospyros kaki Thunb.)(Crop Production & Cropping Type)  [in Japanese]

カキ'西条'果実の樹上軟化について,自然災害を想定した処理や環状剥皮処理での再現を試みた.その結果,環状剥皮処理区での軟化発生率が約20%と最も高く,処理により誘導されたエチレンが樹上軟化発生の原因である可能性が示された.また,収穫後果実の軟化発生について調査したところ,湛水処理区および環状剥皮処理区において非常に高い軟化発生率が認められた.従って,湛水状態になったり環状剥皮によって,収穫後軟化を起こす生理状態になった可能性がある.また,ヘタ直下の果実内部黒変と樹上または収穫後軟化に密接な関連性があることが明らかとなった.

The mechanism of enhanced fruit softening on the tree following natural disaster was investigated in 'Saijo' persimmon (Diospyros kaki Thunb.) by girdling, defoliation and flooding treatments. The highest rate of fruit softening on the tree occurred after girdling treatment (20%). It is possible that ethylene production caused by girdling treatment may be involved in the subsequent fruit softening. Postharvest investigation also indicated that flooding or girdling treatments yielded the highest incidence of fruit softening. These results indicate that flooding caused by natural disaster or girdling induces physiological stress that results in fruit softening of 'Saijo' persimmon. It was clear that fruits with black spots below the calyx easily softened before and after harvest.