Effects of girdling on berry quality of "Pione" grapevine [Vitis]
2005
Fujishima, H.(Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Shiraishi, M. | Shimomura, S. | Horie, Y.
Effects of arm- and trunk-girdling on berry quality traits throughout ripening stage of 'Pione' grapevines exhibiting more vigorous growth were determined. Arm-girdled vine: the differences in berry weight between the girdled and control were not significant; coloring, anthocyanin content, and Brix were significantly increased by girdling; there were no significant differences in the decrease in free acidity and the increase in beta ratio (ratio of tartaric acid to malic acid) between the girdled and control vines. Trunk girdled vines: coloring of the girdled vines was superior to that of the control; per cent of well-colored grapes (a value above 7 on the color chart) among the total production on August 11 was much high on girdled vines and ranged from 55 to 86%, whereas that on control vines was low at 7%; coloring, anthocyanin content and Brix were significantly increased by girdling; there were no significant differences in cluster weight, berry weight, free acidity, and beta ratio between the girdled and control vines. Results demonstrated that the coloring and Brix of 'Pione' grapevine could be increased by girdling, thereby enabling grape growers to improve the fruit quality produced in the southwest part of Japan which usually has warm-night temperatures in summer.
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