Anatomical Changes and Anthocyanin Contents of the Exocarp by Ethyl Oleate Treatment on 'Merlot' Grapes

초록

Preharvest treatment with 4% ethyl oleate on 'Merlot' (Vitis vinifera L.) grape reduced the thickness of the epidermal and hypodermal layers with significantly enhanced pigmentation. Thickness of the skin in treated berries was 90-107 mu m, whereas those in control berries were 126-189 mu m Decreases in the thickness of epidermal and hypodermal cell layers seemed to be due to cellular death or dehydration by rapid senescence after the treatment. Immediate change observed in treated berries was the deformation of the wax that appeared melted resulting in color improvement. Total anthocyanin was also increased by ethyl oleate treatment. Separate forms of anthocyanins, acylated and methoxylated anthocyanins increased, whereas hydroxylated anthocyanins tended to decrease.

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