Efficacy of paclobutrazol and gibberellin on growth and flowering of three Curcuma species
2003
Sarmiento, M.J. | Kuehny, J.S.
Rhizomes of Curcuma alismatifolia Roxb. 'Chiang Mai Pink', C. gracillima Roxb. 'Violet', and C. thorelii Roxb. were soaked in gibberellin (GA(4+7)) at 0, 200, 400, or 600 mg.L(-1) (ppm) and planted into 15.2-cm-diameter (6 inches) containers. The plants were grown in a greenhouse at 30 degrees C day/23 degrees C night (86.0/73.4 degrees) temperatures. When shoot height was 10 cm (3.9 inches), the plants were drenched with 118 mL (3.9 fl oz) of paclobutrazol at 0, 2, 3, or 4 mg a.i. per 15.2-cm-diameter container. Gibberellin(4+7) delayed shoot emergence and flowering but did not affect the flower number. Paclobutrazol rates were not effective in controlling height of C. alismatifolia 'Chiang Mai Pink' averaging 85 cm (33.5 inches), C. gracillima 'Violet' averaging 25 cm (9.8 inches), or C. thorelii averaging 17 cm (6.7 inches). Curcuma alismatifolia 'Chiang Mai Pink', C. gracillima 'Violet', and C. thorelii had postproduction longevities of 4.6, 2.6 and 3.8 weeks respectively, making these three species of curcuma excellent candidates for use as flowering pot plants.
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