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Studies on the Physico-Chemical Changes in Fruits of Jujube (Ziziphus mauritiana Lam.) ‘Tainung No. 9’, ‘Tainung No. 12’ and ‘Tainung No. 13’ during Development and Storage
Fruit appearance of jujube varieties ‘TN 9’, ‘TN 12’ and ‘TN 13’ after storage at 5℃ for 20 d.
Fruit appearance of jujube varieties ‘TN 9’, ‘TN 12’ and ‘TN 13’ after storage at 5℃ for 20 d.

Author:Jhan-Hong Guo, Min-Chi Hsu, Kuo-Dung Chiou, Wen-Li Lee, and Yu-Shen Liang*

Abstract:

To investigate the physico-chemical changes of jujube fruit during growth and stage, the varieties of ‘TN 9-New Honey King’, ‘TN 12-Water Honey’, and ‘TN 13-Shirley’ were used as materials. The results showed that the fruit growth pattern appeared double the sigmoid curve on fruit fresh weight, fruit longitudinal diameter, and fruit cross diameter. ‘TN 13’ reaches its maximum weight and total soluble solids content increasing over the rate of 10°Brix after 100 d pollination, whereas ‘TN 9’and ‘TN 12’ reached their maximum after 120–130 d after pollination. ‘TN12’ produced the least amounts of the respiration rate and the ethylene production rate during fruit ripening. Compared with ‘TN 12’, ‘TN 9’ produced a higher respiration rate by 1.75 times; ‘TN 9’ and ‘Xue Mi’ varieties produced higher ethylene production rates by 4 times. The peel color lightness of Tainung varieties was 50 at harvest. The peel chroma values of ‘TN 9’, ‘TN 12’ and ‘TN 13’ was 38, 30, and 43, respectively, at harvest. The hue angle of ‘TN 9’, ‘TN 12’ and ‘TN 13’ was 97°, 95°, and 110°, respectively, at harvest. The decay rate of ‘TN 9’ occurred earlier during the storage was higher than the other varieties,‘TN 12’ chilling injury index rose fastest when being stored at 5℃ and 1℃. ‘TN 13’ performed slightly better than the control ‘Jin Tao’ variety at 5℃ and 1℃ in chilling injury index. The decay rate was slightly lower than the control ‘Jin Tao’ variety at 5℃ and 1℃. The total soluble solids performed better than the ‘Jin Tao’ varieties during storage.

Key words:India jujube, Tainung, Double sigmoid curve, Fruit growth and development, Storage life

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