Tight control of growth and cell differentiation in photoautotrophically growing moss (<Emphasis Type="Italic">Physcomitrella</Emphasis><Emphasis Type="Italic">patens</Emphasis>) bioreactor cultures |
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Authors: | A Hohe E Decker G Gorr G Schween R Reski |
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Institution: | 1.Freiburg University, Plant Biotechnology,Freiburg,Germany |
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Abstract: | The use of the moss Physcomitrella patens as a production system for heterologous proteins requires highly standardised culture conditions. For this purpose a semi-continuous photoautotrophic bioreactor culture of Physcomitrella was established. This culture grew stably for 7 weeks in a 5-l bioreactor with a dilution rate of 0.22/day. Enrichment of the air for aeration in a batch bioreactor culture with 2% (v/v) CO2 resulted in an increase in the specific growth rate to 0.57/day. Changes in the pH of the semi-continuous bioreactor culture medium between pH 4.5 and pH 7.0 influenced protonema differentiation; however it did not negatively affect the growth rate compared to uncontrolled pH. The advantages of Physcomitrella as a system for the production of heterologous proteins in plants are discussed. |
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