Treatments with indole-3-acetic acid (IAA) at 0.1% (w/w) in lanolin paste to the cut surface of the top internode of excised stem from growing shoots of cooled tulip (Tulipa gesneriana L. cv. Apeldoorm) bulbs greatly promoted the growth of all internodes of the stem. In control stems treated with lanolin only in the same way as IAA applocation, the stem growth was very small. The fresh weight of the stems treated with IAA was much higher than that of the intreated stems, but the total dry weight of the stems of both treatments was similar. Dry weight of the first internode, substantially decreased with IAA, whereasw that of the upper internodes increased. On the basis of dry weight of different internodes of untreated and IAA treated srems it is evident that carbohydrates occurring in the first (basal) internode are utilized for the growth of the upper internodes especially the third and fourth (top) internodes with auxin.
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