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Ornamental values of cut tulip (Tulipa gesneriana L.) flowers are reduced by elongation of the flower stalks and leaf yellowing. The effect of pretreatments with 2-chloroethylphosphonic acid (CEPA), 6-benzylaminopurine (BA), and gibberellic acid (GA3) at various concentrations on the vase life of cut ‘Christmas Dream’ flowers was investigated. Pretreatments with CEPA at 25, 50, and 100 mg・L–1 significantly suppressed flower stalk elongation, but shortened the flower longevity by 2 days. Pretreatments with BA at 5, 25, and 125 mg・L–1 suppressed leaf yellowing, but pretreatment with GA3 suppressed leaf yellowing only slightly. Flower longevity was not affected by pretreatments with BA or GA3. A combined pretreatment with 50 mg・L–1 CEPA and 25 mg・L–1 BA suppressed flower stalk elongation and leaf yellowing in cut ‘Christmas Dream’ flowers. Similar results were obtained from 7 cultivars of cut flowers. These results indicate that combined pretreatment with CEPA and BA is effective for suppressing flower stalk elongation and leaf yellowing of cut tulip flowers.

Improvement of Vase Life in Cut Tulips by Pretreatments with 2-Chloroethylphosphonic Acid and 6-Benzylaminopurine