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  Eur.J.Hortic.Sci. 81 (3) 148-151 | DOI: 10.17660/eJHS.2016/81.3.2
ISSN 1611-4426 print and 1611-4434 online | © ISHS 2016 | European Journal of Horticultural Science | Original article

On the role of the light regime in root development of Euphorbia pulcherrima leafy stem cuttings

T. Schwend, M. Kriedel, D. Prucker, S. Peisl and H. Mempel
University of Applied Sciences Weihenstephan-Triesdorf, Freising, Germany

SUMMARY
The development of primordial roots of Euphorbia pulcherrima cuttings coincides with a significant increase in photosynthesis. Therefore, Svenson and Davies (1990) suggested that supplementary lighting has no effect on root development of Euphorbia pulcherrima cuttings before primordial roots develop. In this study this hypothesis was experimentally challenged. Cuttings were cultivated with supplementary lighting from the day of sticking and compared to cuttings that were exposed to the same lighting after primordial root development. Our data show that both sets of cuttings developed equally well and both did better than cuttings that were cultivated without supplementary light. Moreover, the data show that light quality had a major impact on root number, length and weight. Therefore, this study confirms the hypothesis of Svenson and Davies (1990) and shows that the positive effect of supplementary lighting is partially mediated by photoreceptors.

Keywords photosynthesis, primordial root, photoreceptor, light quality

Significance of this study

What is already known on this subject?

  • Lighting promotes root development of Poinsettia cuttings.
What are the new findings?
  • Light quality has a major effect on root development.
What is the expected impact on horticulture?
  • Optimized spectra can be used to improve root development.

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E-mail: heike.mempel@hswt.de  

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Received: 23 February 2016 | Revised: 4 April 2016 | Accepted: 23 May 2016 | Published: 20 June 2016 | Available online: 20 June 2016

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