2020 Volume 19 Issue 3 Pages 247-252
The Asiatic hybrid lily ‘Kitakirari’ has a division-type bulb that produces multiple flower stalks, and bulbs for cut flower production are cultivated for 2 or 3 years in an open field. The division-type bulb forms bulblet primordia on the stalk axis in the mother bulb, and then the bulblets enlarge; as a result, the bulb divides. In this study, the effects of temperature on ‘Kitakirari’ division in bulb production were investigated with the bulblet attached to biennial plants. In experiment 1, the effects of temperature before freezing storage on bulb quality in the final stage of bulb production were investigated. When the bulbs were treated at 8°C for 12 weeks before freezing storage, many non-standard bulbs were observed. The non-standard bulbs had five or more bulblets in the mother bulb and were not suitable for use in cut flower production. In contrast, non-standard bulbs were not found in the treatment group that was promptly frozen and stored at –2°C. In experiment 2, although temperature treatments after freezing storage did not affect the number of bulblets in the mother bulb, the bulb weight in the high-temperature group (heat cultivation at 15°C) was significantly heavier than in the low-temperature group (cultivation in the open field), and the bulb width was also significantly greater than in the low-temperature group.
