ISHS Acta Horticulturae 109: III International Symposium on Flower Bulbs
PROPAGATION OF HYACINTH BY HOT TEMPERATURE TREATMENT |
| Authors: | M. Amano, K. Tsutsui |
| Abstract:
The artificial propagation of hyacinth by hot temperature treatment was studied so that knife incisions could be eliminated and a large volume of bulbs could be treated at one time, while at the same time the Yellows caused by Xanthomonas hyacinthi could be controlled. The results are summarized as follows: The temperature and duration of the hot treatment were exactly the same as for the control of the Yellows, i.e. at 43°C for 4 days or 38°C for 30 days. Another method of propagation at 40°C for 7.0 – 7.5 days was tried but it seemed to be less effective. The 38°C method of treatment proved to be safe even when prolonged for ten days, while the 43°C and 40°C methods of treatment held the advantage of short duration. Treatments could be begun at any time between mid-July and early September. The largest number of divided bulblets could be obtained when treatments were started in mid to late August, and the thickening of bulblets decreased with delayed treatment. The size of the mother bulb to be used for propagation should be over 15 cm in circumference. The relative humidity had a great influence on both bulblet division and high temperature disorders. Treatment under comparatively low humidity, around 60 – 70%, was found to bring about stabilized results. Also the mechanism of bulblet division by this treatment was studied for changes in respiratory rate, amylase activity and dehydrogenase activity of bulb tissue. | |
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