Plant Cell, Tissue and Organ Culture

, Volume 56, Issue 3, pp 145–153 | Cite as

In vitro PPFD and media composition affect both in and ex vitro performance of Alstroemeria Butterfly-hybrids

  • Kell Kristiansen
  • Holger Ørnstrup
  • Kirsten Brandt


The objective was to reduce in vitro production costs while retaining or improving plant quality, in particular the suitability for pot plant production. Plants were grown at photosynthetic photon flux densities (PPFD) of 0–40 μmol m-2 s-1 and sucrose concentrations of 3–7% during the multiplication phase and the effects of sucrose, BA, and NAA during root formation were investigated. Ex vitro growth were tested in both experiments. A small reduction in the rhizome multiplication rate was found with increasing PPFD and sucrose concentration. Increasing sucrose concentration reduced the number of aerial shoots. Aerial shoots were etiolated when cultured in darkness and their number increased with increasing PPFD at 3% sucrose, whereas PPFD did not affect the number of aerial shoots at 5 or 7% sucrose. During the multiplication phase a synergistic promoting effect of PPFD and sucrose was observed on root formation. Root formation after transfer to rooting medium was affected by sucrose and PPFD during the multiplication phase. PPFD did not influence root formation after propagation on 7% sucrose, whereas on 3 or 5 % sucrose root formation was gradually inhibited when PPFD was decreased below 17 μmol m-2 s-1. The formation of thick roots was promoted by propagation in light, and not influenced by sucrose concentration. Ex vitro growth was not affected by in vitro conditions, except for 7% sucrose during the multiplication phase that reduced flowering. Root formation on rooting medium was reduced by BA and promoted both by NAA and high levels of sucrose. The root inhibiting effect of BA could not completely be overcome by simultaneous application of NAA and high sucrose concentrations. Thick roots were only produced in the presence of NAA, and not affected by sucrose treatment. Ex vitro flowering was negatively influenced by the presence of BA during root formation and by high levels of sucrose if BA was absent in the rooting medium. High sucrose levels and NAA could partially compensate for the negative effect of BA on flowering.

auxin cytokinin flowering multiplication rate root formation sucrose 


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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Kell Kristiansen
    • 1
  • Holger Ørnstrup
    • 1
  • Kirsten Brandt
    • 1
  1. 1.Research Group for Plant Breeding and Propagation, Department of OrnamentalsDanish Institute of Agricultural ScienceÅrslevDenmark

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