Effect of flooding on shoot and root growth of rooted cuttings of four grape [Vitis] rootstocks
1996
Kawai, Y. (Mie Univ., Tsu (Japan). Faculty of Bioresources) | Benz, J. | Kliewer, W.M.
The effect of different severities of root flooding at budbreak and 70 days after budbreak (8 to 12 leaf stage) on root and shoot growth of AXR-No.1, St. George, 110R, and 420A rootstocks was investigated. The four severities of root flooding were control (0%), 33, 67 and 100% of the root soil volume of each rootstock. At the budbreak stage, root and shoot growths of all rootstocks were strongly inhibited when two-thirds or more of the root soil volume was flooded. At 100% root flooding, there was no new root growth. The number of buds that sprouted and developed was unaffected by flooding. Within 10 to 15 days after flooding, the cuttings at 8 to 12 leaf stage of 420A and 110R grew poorly. The color of roots exposed to 100% root flooding turned black in contrast to control plans which were mostly white. Flooding reduced the concentration of potassium and calcium in petioles of AXR-No.1 rootstocks markedly. Among the four rootstocks investigated, AXR-No.1 which was the most tolerant to flooding had the best shoot and root growths, followed by St. George, 110R and 420A
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