Effects of Different Rootstocks on Shoot Growth, Development of Flower Clusters, and Berry Growth of 'Fujiminori' Grapes
1992 Volume 61 Issue 3 Pages 513-520
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1992 Volume 61 Issue 3 Pages 513-520
The objective of this study was to study the effects of different rootstocks on shoot and berry growth of 'Fujiminori' grapes. Budbreak, shoot growth, development of flower clusters, berry growth, and berry quality were investigated in 2-year-old vines grafted on seven different rootstocks: 3309, 3306, 101-14, 5C, 8B, SO•4, and 420A. Vines were grown in plastic containers in an unheated plastic house.
Budbreak began earlier and shoot growth was more vigorous on vines grafted on 3306, SO•4, and 101-14 compared with those on 420A, 8B, and 5C stocks. The number of lateral shoots and their lengths were smallest on scions grafted on 420A stock.
More flower clusters per shoot were formed on vines grafted on 420A, 8B, and 3306 than were formed on 101-14. Although the number of florets per cluster was not significant among shoots on different rootstocks, the rate of elongation of panicles in vines grafted on both 101-14 and 5C tended to be faster than it was on SO•4 and 420A. No difference was observed in the percentage set of berries among the vines grafted on six stocks except for 420A, in which the set was significantly higher. Small differences in both flowering time and 'veraison' were observed among the vines grafted on seven stocks. The ratio of seeded berries to total berries was higher in vines grafted on SO•4 and 420A stocks than it was vines on 8B and 3306 stocks.
The largest berries were observed in vines grafted on 3306, followed by those on 101-14 and 3309, whereas berries on vines grafted on 5C, SO•4, and 420A were smallest. The total soluble solids of the juice were highest in berries harvested from vines on 3309, SO•4, and 3306 stocks. The titratable acidity was relatively low in vines grafted on all stocks, especially that on SO•4. Vines grafted on 3306 stock yielded berries with the highest level of anthocyanin in the skin; the berries from other 'Fujiminori' vines were about equally pigmented.
