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An efficient bioreactor platform for scaling up the proliferation of Nordmann fir’s (Abies nordmanniana) somatic embryos

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Abstract

Increased market demand for high-quality Nordmann fir (Abies nordmanniana) Christmas trees, achieving reduced production costs and improved pest resistance, necessitates the establishment of efficient mass micropropagation platforms for the species. Somatic embryogenesis is a powerful tool for clonal propagation of woody plants. Utilizing the advantages of liquid culture media over solid media, the scalability of Nordmann fir somatic embryo proliferation was investigated through developing a batch culture using the disposable WAVE bioreactor (DWB) system, without feedback controls for pH and dissolved oxygen. This study revealed that the inoculation of a 10-L cellbag with 1 g L−1 FW (fresh weight) of A. nordmanniana embryogenic callus can produce ~ 70,000–111,000 vigorous and synchronized somatic embryos. Such outcomes were achieved with the rock speeds of 25 and 35 rpm and rock angle of 6° for 25 days at 24 ± 1 °C, respectively. The gas mix was a combination of O2 (21%) and a stepwise reduction of CO2 ended by 2% (v/v), at a flow rate of 0.2 L min−1. The application of 500 mg L−1 of 2-(N-morpholino)ethanesulfonic acid (MES) effectively stabilized the pH between 5.3 and 5.4. Furthermore, DWB was found an efficient system for accelerating and scaling up the proliferation of A. nordmanniana somatic embryos, as it is a high-yielding, user-friendly, functional, and rapid alternative to conventional methods with solid media.

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Source of the figures: Operator’s manual of the system 20/50EHT (series). Part # 450026, Version: 10-2007, Type: 20/50EHT CE. WAVE/GE Healthcare Bioscience BioProcess Corp, NJ, USA

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Acknowledgement

The authors would like to appreciate the Green Development and Demonstration Program [Grønt Udviklings- og Demonstrationsprogram (GUDP) - Grant number: 34009-16-1081] of the Danish Ministry of Food, Agriculture and Fisheries for creating an opportunity to conduct the present article. Furthermore, the deceased senior scientist Jens Find, formerly Associate Professor at the Section for Forest, Nature and Biomass – University of Copenhagen, is gratefully acknowledged for his effort in organizing the Cell and Tissue Culture Laboratory as well as for preparing the bioreactor platform. Our appreciation is extended to the lab technicians Lisbeth Hansen and Nanna Jacobsen as well as the laboratory coordinator of the section “Preben Frederiksen” for their assistance in the present project. Our special thanks go to Janne Simola from GE Healthcare for his sincere assistance in initial setup of the WAVE bioreactor.

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Correspondence to A. Valdiani.

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Editorial responsibility: Parveen Fatemeh Rupani.

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Valdiani, A., Hansen, O.K., Johannsen, V.K. et al. An efficient bioreactor platform for scaling up the proliferation of Nordmann fir’s (Abies nordmanniana) somatic embryos. Int. J. Environ. Sci. Technol. 17, 1425–1438 (2020). https://doi.org/10.1007/s13762-019-02556-4

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  • DOI: https://doi.org/10.1007/s13762-019-02556-4

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