Fruit quality of 'Gros Colman' grapes [Vitis vinifera] produced on virus-free vines
1999
Okamoto, G. (Okayama Univ. (Japan). Faculty of Agriculture) | Miki, Y. | Suyama, A. | Inubushi, H. | Hirano, K.
The grape cultivar 'Gros Colman' (Vitis vinifera) is the latest-maturing variety in Japan, mainly cultivated in green-houses in southern Okayama. Vines treated with virus-free treatments before raising in a nursery bed have been introduced in the last decade to improve the fruit quality, especially skin coloration and sugar content. However, some growers feel that the fruit taste from treated vines tends to deteriorate earlier than that from untreated vines. We investigated change in the qualities of the berries produced on treated and untreated vines from October to January. After analyzing skin color, berry turgidity, and juice constituents, we concluded that the palatability of berries on virus-free vines might be lessened in late December or thereafter because of the rapid decrease in amino acids such as glutamic acid, glutamine, and alanine, which considerably affects fruit taste
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