Studies on the Physiology of Hyacinth Bulbs (Hyacinthus orientalis L.)

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Abstract
The activities of auxin, gibberellin, cytokinin, and abscisic acid were investigated, at 3-weekly intervals, in hyacinth /{Hyadnthus orientalis L.) bulbs during flower bud formation in dry storage for 12 weeks at 25 /'b0C and during dormancy release in the period of 12 weeks of cold treatment at 3 /'b0C after planting. The formation of the flower bud coincided with a gradual increase in the activity of cytokinins and auxins in the bulbs, whereas the level of abscisic acid was almost stable. Gibberellin activity was not detectable in lifted bulbs, but it appeared after 6 weeks of dry storage and declined in bulbs stored for 12 weeks. The cold storage of bulbs resulted in a gradual decrease of abscisic acid and it was not detectable in the bulbs cooled for 12 weeks. The content of auxins was highest in the bulbs during their rooting in the first 3 weeks of cold treatment and gradually decreased thereafter. The cytokinin activity declined in the bulbs cooled for 6 weeks, while gibberellins appeared in them. In the bulbs cooled for a longer time a lack of gibberellin activity and a gradual increase of cytokinin content was observed.

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