Abstract

Stalk explants isolated from uncolled and cooled tulip bulbs cultivar ‘Oxford’ were cultured on Murashige—Skoog medium supplemented with 10 mg l −1 IAA. Explants were cultured in normal (basal end down) or inverted (basal end up) positions. Distinct stalk growth of explants isolated from uncooled and cooled bulbs was observed when they were cultured in the inverted position, in the presence of IAA in the medium. In other cases, elongation of stalk explants was slight. Thus, only basipetal transport of LAA is responsible for the induction of tulip stalk growth.

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