Abstract
Effects of 2, 3, 5-triiodobenzoic acid (TIBA) with gibberellic acid (GA3) and root excision on growth and flowering of non pre-cooled tulip bulbs were investigated. GA3 partly replaced the cold requirement of the bulbs, and when TIBA was applied with GA3, growth and flowering were promoted even more. The later the treatment with GA3 or GA3+TIBA, the earlier the flowering and longer the flower stalk. Excision of roots was more effective for early flowering and flower stalk elongation of the GA3+TIBA treated bulbs when planted later (after November), probably due to better absorption of GA3 from the cut surface at the basal plate. Naphthylphthalamic acid (NPA), another auxin transport inhibitor, with GA3 showed similar effects to those of TIBA. The endogenous content of indole-3-acetic acid (IAA) in the basal plate and lower internodes was higher with GA3+TIBA treatment than with GA3 treatment alone, indicating that TIBA blocked the auxin transport at the basal plate and increased auxin content in the stems, thereby promoting early flowering and internode elongation.
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