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Influence of bagging on coloration of Honny Red grape
In order to study the coloration of red grape berries , four different color paper bags of white, blue, yellow and double dark were used for bagging on the fruits of Vitis labrusca Vitis vinifera varieties, and the anthocyanin and chlorophyll contents of berry skin, the total soluble solids and acidity of juice had been analyzed. Furthermore, the color chart was also made for the coloration of berries. In the results, it was found that there was no influence on soluble solids and acidity after different color bag treatments in the same variety. While in the anthocyanin contents, when grapes were bagged in white bag, its skin had the highest content, then were the blue bag and yellow bag. The double dark bag bagging grapes appeared yellow-green color, and the content of anthocyanin showed the lowest. Except the double dark bag treatment, all grapes of the other treatments were easily over-coloration. There was no relationship between coloration and chlorophyll, nor the soluble solids and acidity. The winter grape was more easily over-coloration than the summer grape berries. Otherwise, when treated bags were changed to cluster cap, soluble solids and acidity contents of juice had no difference with the control, but anthocyanin and chlorophyll contents of skin were lower than the control.
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