ISHS Acta Horticulturae 673: IX International Symposium on Flower Bulbs
ONLY FULL COOLING OF MOTHER TULIP BULBS IS NECESSARY FOR DAUGHTER BULB FORMATION FROM DAUGHTER BUDS |
| Authors: | M. Saniewski, H. Okubo |
| Keywords: | tulip, Tulipa gesneriana, cooling, mother bulbs, daughter bulb formation, daughter buds |
| Abstract:
Mother tulip bulbs planted in the autumn require a long cold period before satisfactory stem extension with flower development and enlargement of daughter buds to bulbs will occur in spring. Little is known of the underlying physiological mechanism of daughter bulb formation from daughter buds. In our studies we used tulip bulbs cv. Apeldoorn cooled at 5°C. We found that for the growth of daughter bulbs in tulips, only full cooling of mother bulbs was necessary, not the growth of shoot and roots when the bulbs were stored at room temperature after cooling (without planting of bulbs). It was interesting that daughter bulbs were formed when mother bulbs are stored for extended periods (about seven months) at 5°C. In most of the daughter bulbs that formed in these conditions, flower bud differentiation took place and flowering occurred during the next season after sufficient cooling. The mechanisms of transporting food reserves from the mother bulb directly to daughter buds to grow daughter bulbs, including the role of plant hormones and flavonoids, is discussed. | |
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