著者

Toshihiko Sugiura Mikio Shiraishi Shohei Konno Akihiko Sato

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.OKD-061, (Released:2017-04-26)

被引用文献数

11

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To develop a method for predicting the skin color of grape berries of three cultivars of Vitis labrusca L. × Vitis vinifera L. grown in Japan, we investigated the relationship between skin color and air temperature in the grape production areas of 18 prefectures. When mean air temperature during the 40 days before harvest date was ≥24°C, the skin color ratings of ‘Kyoho’, ‘Pione’, and ‘Suzuka’ were significantly negatively correlated with temperature. Skin color ratings decreased by about 1 unit per 1°C increase; at a given mean air temperature during this period, the rating of ‘Suzuka’ was higher (by 0.7 units) than that of ‘Kyoho’, which was higher (by 1.0 unit) than that of ‘Pione’. Because an approach to predict harvest date has not been established, we developed a method to predict skin color at harvest based on air temperature after the full-flowering date. We found the times that had a strong negative correlation between the mean air temperature and the skin color rating at harvest was 43 days from 50 DAF (days after full flowering) for ‘Kyoho’, 46 days from 46 DAF for ‘Pione’, and 42 days from 52 DAF for ‘Suzuka’. We obtained a linear regression equation for the relationship between the skin color rating at harvest and the mean air temperature during the periods. If the full-flowering date is known, it is possible to predict skin color at harvest by using this equation and the predicted air temperature after full flowering. We also developed a method for predicting anthocyanin contents in berry skins at harvest using significant regressions among the skin color rating, the skin anthocyanin content, and mean air temperature.