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Rooting of ornamental cuttings affected by spectral light quality

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Abstract
Adventitious rooting is a critical process in the vegetative propagation of ornamental plants. A well-rooted cutting is essential for optimal growth and high quality plants. We investigated the use of spectral light quality to improve adventitious rooting of cuttings in three ornamental species: Chrysanthemum x morifolium, Lavandula angustifolia and Rhododendron simsii hybrids (azalea). Different combinations of red (R) and blue (B) LEDs were tested: R:B 100:0, 90:10, 80:20, 50:50, 10:90 and 0:100 at a light intensity of 60 mu mol m(-2) s(-1) for chrysanthemum and lavender and 30 mu mol m(-2) s(-1) for azalea. No natural light was supplied. The rooting quality was assessed by determining the rooting percentage, the amount of roots and the root dry weight. For all three species, rooting was highly efficient under 100% red light. Polar auxin transport was also influenced by the different light spectra as demonstrated by the use of auxin transport inhibitors. For chrysanthemum, rooting was most inhibited under 10:90 R:B, while for azalea the inhibition in rooting was highest under 50:50 R:B. The use of LEDs for rooting of ornamental cuttings is promising if it can be used in a multi-layered system. The controlled environment will lead to a year-round high quality rooted cutting production.
Keywords
GROWTH, AUXIN, PLANT, adventitious rooting, auxin, azalea, lavender, chrysanthemum, light emitting diode, LED

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Chicago
Christiaens, Annelies, Marie-Christine Van Labeke, Bruno Gobin, and Johan Van Huylenbroeck. 2015. “Rooting of Ornamental Cuttings Affected by Spectral Light Quality.” In Acta Horticulturae, ed. RA Criley, 1104:219–224. Leuven, Belgium: International Society for Horticultural Science (ISHS).
APA
Christiaens, A., Van Labeke, M.-C., Gobin, B., & Van Huylenbroeck, J. (2015). Rooting of ornamental cuttings affected by spectral light quality. In R. Criley (Ed.), Acta Horticulturae (Vol. 1104, pp. 219–224). Presented at the 29th International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC) ; 17th International symposium on Horticultural Economics and Management ; 5th International symposium on Improving the Performance of Supply Chains in the Transit Economies, Leuven, Belgium: International Society for Horticultural Science (ISHS).
Vancouver
1.
Christiaens A, Van Labeke M-C, Gobin B, Van Huylenbroeck J. Rooting of ornamental cuttings affected by spectral light quality. In: Criley R, editor. Acta Horticulturae. Leuven, Belgium: International Society for Horticultural Science (ISHS); 2015. p. 219–24.
MLA
Christiaens, Annelies, Marie-Christine Van Labeke, Bruno Gobin, et al. “Rooting of Ornamental Cuttings Affected by Spectral Light Quality.” Acta Horticulturae. Ed. RA Criley. Vol. 1104. Leuven, Belgium: International Society for Horticultural Science (ISHS), 2015. 219–224. Print.
@inproceedings{8156953,
  abstract     = {Adventitious rooting is a critical process in the vegetative propagation of ornamental plants. A well-rooted cutting is essential for optimal growth and high quality plants. We investigated the use of spectral light quality to improve adventitious rooting of cuttings in three ornamental species: Chrysanthemum x morifolium, Lavandula angustifolia and Rhododendron simsii hybrids (azalea). Different combinations of red (R) and blue (B) LEDs were tested: R:B 100:0, 90:10, 80:20, 50:50, 10:90 and 0:100 at a light intensity of 60 mu mol m(-2) s(-1) for chrysanthemum and lavender and 30 mu mol m(-2) s(-1) for azalea. No natural light was supplied. The rooting quality was assessed by determining the rooting percentage, the amount of roots and the root dry weight. For all three species, rooting was highly efficient under 100\% red light. Polar auxin transport was also influenced by the different light spectra as demonstrated by the use of auxin transport inhibitors. For chrysanthemum, rooting was most inhibited under 10:90 R:B, while for azalea the inhibition in rooting was highest under 50:50 R:B. The use of LEDs for rooting of ornamental cuttings is promising if it can be used in a multi-layered system. The controlled environment will lead to a year-round high quality rooted cutting production.},
  author       = {Christiaens, Annelies and Van Labeke, Marie-Christine and Gobin, Bruno and Van Huylenbroeck, Johan},
  booktitle    = {Acta Horticulturae},
  editor       = {Criley, RA},
  isbn         = {9789462610903},
  issn         = {0567-7572},
  keyword      = {GROWTH,AUXIN,PLANT,adventitious rooting,auxin,azalea,lavender,chrysanthemum,light emitting diode,LED},
  language     = {eng},
  location     = {Brisbane, QLD, Australia},
  pages        = {219--224},
  publisher    = {International Society for Horticultural Science (ISHS)},
  title        = {Rooting of ornamental cuttings affected by spectral light quality},
  url          = {http://dx.doi.org/10.17660/ActaHortic.2015.1104.33},
  volume       = {1104},
  year         = {2015},
}

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