ISHS Acta Horticulturae 395: Dormancy and the related Problems of Deciduous Fruit Trees
THE INFLUENCE OF SCION SOURCES AND WARM WATER DIPPING ON DORMANCY BREAKING AND FRUIT OF ‘KOSUI’ AND ‘HOSUI’ PEAR GRAFTED TO ‘HUNGSHAN’ PEAR IN TAIWAN |
| Authors: | C. Chen, A.A. Tsai, M.C. Lin, Y.D. Kang |
| Keywords: | Pear, Flower bud dormancy, Grafting culture |
| Abstract:
Twigs of ‘Kosui’ and ‘Hosui’ pear, containing lateral floral buds, were taken from trees growing in the Taiwanese highlands (24N - 121E, Altitude 2, 100m) and in Fukushima Japan (38N - 140E, Altitude 100m). The twigs were dipped in hot water, heated to 45°C for 10, 20, and 30 minutes respectively, and then cut into single buds and grafted, in December 1992 and January 1993, onto water sprouts of ‘Hungshan’ pear growing in the lowland Guoshing area of Taiwan (24N-121E, Altitude 600m). Twigs from trees growing in Japan were removed on Nov. 17, 1992 and shipped (held at 5°C for the 3-week shipping period), while those from the Taiwanese highlands were cut to single bud scions immediately following removal and grafted. Dipping buds in warm water advanced bloom by 5 to 10 days and resulted in a concentration of bloom as well. The bloom of buds imported from Japan was slightly earlier than those collected from the Taiwanese highlands. The effect of the warm water dip gradually disappeared, and buds treated in this manner and grafted in January bloomed later than the controls. On the other hand, increasing the water temperature to 50°C during a 10-minute dip resulted in damage to the scions. Due to the bloom advance, fruit harvest occurred earlier. The 45°C warm water treatment in early winter, of Taiwanese or Japanese scions of ‘Kosui’ and ‘Hosui’ pear, produced normal flowers, fruit set, and fruit growth on grafted trees of ‘Hungshan’ pear. | |
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