Articles
Comparison of fruit quality according to harvest time of Shine Muscat grape (Vitis labruscana Bailey × V. vinifera L.)
Article number
1353_39
Pages
317 – 322
Language
English
Abstract
Koreas Shine Muscat fruit is a commonly consumed table grape cultivar.
However, the quality of this fruit changes drastically depending on the harvest time.
Therefore, changes in color, sugar content, acidity, and hardness were investigated at different harvest dates.
We observed that berry size increased steadily until 90 d after full bloom (DAFB), then remained relatively stable.
The sugar content increased rapidly around 70 DAFB, gradually increased further after 80 DAFB, and finally reached 24 °Brix at 160 DAFB. Moreover, sugar content showed differences between growing seasons.
Acidity showed an opposite trend of sugar content.
As observed, while slight differences occurred depending on the year, the understudied grape cultivar had a sugar content of 17-18 °Brix between 90 and 110 DAFB. Simultaneously, the sugar-acid ratio was ~44, the acid content was 0.32-0.44%, the coloration was 2.67 (1-5), and the fruit hardness was 0.48-0.39 (kg Φ5 mm‑1). From the coloration (Lab) value analysis, we observed that the Lab-a value increased and the Lab-b value decreased as the harvest progressed.
Subsequently, based on mineral fruit content changes, we observed that the phosphoric acid content in the fruit increased as the harvest time was delayed.
Notwithstanding, no change in the content of cations, such as sodium, magnesium, and calcium, was observed.
As for the sugar composition ratio in the fruit, while the glucose-fructose content was similar, the sucrose content was low.
However, the quality of this fruit changes drastically depending on the harvest time.
Therefore, changes in color, sugar content, acidity, and hardness were investigated at different harvest dates.
We observed that berry size increased steadily until 90 d after full bloom (DAFB), then remained relatively stable.
The sugar content increased rapidly around 70 DAFB, gradually increased further after 80 DAFB, and finally reached 24 °Brix at 160 DAFB. Moreover, sugar content showed differences between growing seasons.
Acidity showed an opposite trend of sugar content.
As observed, while slight differences occurred depending on the year, the understudied grape cultivar had a sugar content of 17-18 °Brix between 90 and 110 DAFB. Simultaneously, the sugar-acid ratio was ~44, the acid content was 0.32-0.44%, the coloration was 2.67 (1-5), and the fruit hardness was 0.48-0.39 (kg Φ5 mm‑1). From the coloration (Lab) value analysis, we observed that the Lab-a value increased and the Lab-b value decreased as the harvest progressed.
Subsequently, based on mineral fruit content changes, we observed that the phosphoric acid content in the fruit increased as the harvest time was delayed.
Notwithstanding, no change in the content of cations, such as sodium, magnesium, and calcium, was observed.
As for the sugar composition ratio in the fruit, while the glucose-fructose content was similar, the sucrose content was low.
Authors
Hong-Ki Yoon, Kyeong-Jin Kang, Han-na Park, U-Su Lee, Jeong-Hak Seo
Keywords
Shine Muscat (Vitis labrusca × V. vinifera), sugar-acid ratio, harvest time, fruit hardness
Groups involved
- Division Temperate Tree Fruits
- Division Temperate Tree Nuts
- Division Vegetables, Roots and Tubers
- Division Plant-Environment Interactions in Field Systems
- Division Horticulture for Human Health
- Division Postharvest and Quality Assurance
- Division Horticulture for Development
- Division Tropical and Subtropical Fruit and Nuts
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