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This manuscript reports that for tulip bulbs ( Tulipa gesneriana L. 'Apeldoorn'), simultaneous application of methyl jasmonate (JA-Me) with gibberellic acid (GA) increases gum formation in the bulbs, compared to JA-Me applied alone. After the dry scales of the bulbs were removed, the bulbs were treated with JA-Me and GA starting from the beginning of July 20 until November 30. Treated bulbs were stored in a laboratory room in natural light conditions. Gums produced by each treatment were weighted one month after treatment. JA-Me, at concentrations of 0.5 and 1.0% in lanolin, was applied alone, and also applied simultaneously with GA at concentrations of 0.25, 0.5 and 1.0% in lanolin. All the concentrations of GA applied simultaneously with JA-Me, substantially stimulated gum production in tulip bulbs. The production of gums decreased gradually from the beginning of October. The possible mode of action of GA to stimulate gum production in tulip bulbs is also discussed. The focus is on sugar metabolism and ethylene production.
In the present work, 2,3,5-triiodobenzoic acid (TIBA) was applied to uncooled tu­lip bulbs, cultivars Apeldoorn and Gudoshnik, before flower bud formation, at the beginning of July and after flower bud formation, in October and November. Shoot growth and flowering of partially dry-cooled bulbs were substantially stimulated. These results strongly suggest that TIBA partially replaces the cold requirement of the tulip bulbs. In addition, the effect of TIBA is similar to gibberellins applied exogen- ously to the bulbs. Such a gibberellin application partially substitutes for cold treat­ment. Gibberellin application stimulates shoot growth and flowering of tulips. The mode of action of TIBA is discussed in relation to auxin action in tulips.
The interaction of epibrassinolide (epi-BL) with auxin in tulip stem growth and ethylene production were studied. Excision of all leaves and flower bud in isolated shoots (about 5 cm long) of tulip almost totally inhibited stem growth. IAA at both concentrations (0.1% and 1.0%) greatly induced the growth of tulip shoot, but higher concentration at IAA in smaller degree stimulated the growth. Epibrassinolide at concentration 0.05 µM applied simultaneously with auxin did not affect tulip stem growth induced by IAA treatment alone. However, higher concentration of epi-BL (1.0 µM) stimulated tulip stem growth induced by IAA at both concentrations. IAA at both concentrations stimulated ethylene production in the stem internodes of tulips. Higher concentration of auxin stimulated ethylene production more than low concentration. Epibrassinolide applied simultaneously with auxin evidently enhanced ethylene production measured 3 and 5 days after treatment in comparison to IAA treatment alone.
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