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Effect of LED Lighting and Gibberellic Acid Supplementation on Potted Ornamentals

Department of Horticulture & L.A., Oklahoma State University, Stillwater, OK 74078, USA
Department of Statistics, Oklahoma State University, Stillwater, OK 74078, USA
Author to whom correspondence should be addressed.
Horticulturae 2019, 5(3), 51;
Received: 16 April 2019 / Revised: 26 May 2019 / Accepted: 11 July 2019 / Published: 15 July 2019
PDF [235 KB, uploaded 15 July 2019]


Use of light emitting diode (LED) technology is beginning to replace traditional lighting in greenhouses. This research focused on the effects of LED lighting and gibberellic acid supplementation on growth and flowering of Dahlia spp. ‘Karma Serena’, Liatris spicata ‘Kobold’, and Lilium asiatic ‘Yellow Cocotte’. Light treatments, used to extend photoperiod, included LED flowering lamps and halogen lamps that emitted a combination of red + far-red + white, red + white, and broad spectrum from late fall to early spring. Gibberellic acid treatments ranged from 40 to 340 mg L−1 for Asiatic lily ‘Yellow Cocotte’, 50 to 250 for gayfeather ‘Kobold’, and 50 to 150 for dahlia ‘Karma Serena’. Results varied within species in response to light and gibberellic acid. A significant interaction of light with gibberellic acid influenced mean flower number and flowering percentage for dahlia ‘Karma Serena’, while flowering percentage and flower diameter were influenced for Asiatic lily ‘Yellow Cocotte’. Effect of light was most significant on growth and flowering measurements, especially for gayfeather ‘Kobold’ and dahlia ‘Karma Serena’. For gayfeather ‘Kobold’, flowering occurred two weeks earlier under sole LED lighting than under other light treatments and no supplemental light. Although flowering occurred the earliest for dahlia ‘Karma Serena’ under no supplemental light, plants under light treatments had greater height, width, and shoot weight. Significant effects of gibberellic acid on growth and flowering measurements for dahlia ‘Karma Serena’ and Asiatic lily ‘Yellow Cocotte’ were observed for height, width, and flower number. View Full-Text
Keywords: light emitting diodes; GA3; extended photoperiod; greenhouse light emitting diodes; GA3; extended photoperiod; greenhouse
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Mills-Ibibofori, T.; Dunn, B.L.; Maness, N.; Payton, M. Effect of LED Lighting and Gibberellic Acid Supplementation on Potted Ornamentals. Horticulturae 2019, 5, 51.

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