Abstract
Hairy roots of red beet (Beta vulgaris L.) were cultivated in different types of airlift bioreactors (cone, balloon, bulb, drum and column bioreactors of 5 l capacity and containing 3 l of half strength Murashige & Skoog medium). The cone type of airlift bioreactor gave the highest biomass of hairy roots and betacyanin accumulation. Betacyanin accumulation was 27 mg g−1 dry wt in cultures aerated at 0.3 vvm. Light irradiation of 20 μmol m−2 s−1 promoted hairy root growth but optimum betacyanin (34 mg g−1 dry wt) accumulation was with the cultures grown under 60 μmol m−2 s−1.
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