Journal
PLANT CELL REPORTS
Volume 20, Issue 12, Pages 1135-1140Publisher
SPRINGER-VERLAG
DOI: 10.1007/s00299-002-0463-y
Keywords
CO2 enrichment; pH control; photoautotrophic culture; plant cell suspension; semi-continuous bioreactor culture
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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 5-1 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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