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KMID : 0903619860270040383
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Journal of the Korean Society for Horticultural Science
1986 Volume.27 No. 4 p.383 ~ p.388
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The Influence of Paclobutrazol (PP333) Treatment on the Growth and Development of Tulipa gesneriana L.
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Abstract
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This study was initiated to understand the growth retarding arid flowering responses of Tulipa gesneriana L. with paclobutrazol (PP 333) treatment after bulbs were stored at 5℃ for 9 weeks.
Soil drench with 2.5 and 5.0 ㎎ a.i./pot PP 333 markedly reduced lengths of internodes, but foliar spray with 250 and 500㎎/ℓ PP 333 resulted in increased floral bad blasting. Bulb soaking in PP 333 solution (25, 50㎎/ℓ) was almost ineffective.
When PP 333 was drenched in soil 3 weeks after planting in `Golden Apeldoorn´, flowering rate was somewhat decreased. Treatment with a high concentration of PP 333 6 weeks after planting resulted in increased floral bud blasting. However, plant height was greatly reduced when 2.5 and 5.0㎎ a.i./pot PP 333 was drenched in soil either 3 weeks or 6 weeks after planting in `Merry Widow´.
PP 333 reduced cell elongation of the second internodes with a concomitant radial enlargement arid cell radial enlargement of leaves. From these results, it is concluded that PP 333 can reduce plant height effectively when the soil drenching is given within 3 weeks from bulb planting.
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