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Liquid Culture Systems for in vitro Plant Propagation

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Comparison of secondary plant metabolite production 535<br />

concentration of sucrose 45 g l -1 <strong>in</strong> the culture medium resulted <strong>in</strong> an<br />

<strong>in</strong>creased content of hyper<strong>for</strong><strong>in</strong> but a decreased content of<br />

hyperic<strong>in</strong>/pseudohyperic<strong>in</strong>. Thus it is possible to create specific spectra of<br />

bioactive compounds by choos<strong>in</strong>g appropriate cultivation conditions.<br />

For many compounds the economic aspect of the production <strong>in</strong> plant<br />

cells grown <strong>in</strong> bioreactors has been discussed (e.g. Scragg, 1986; Lambie,<br />

1990; Moreno et al., 1995) conclud<strong>in</strong>g that it is of commercial value only <strong>for</strong><br />

very costly compounds. A ma<strong>in</strong> reason <strong>for</strong> this are the high costs of<br />

bioreactor equipment which is around 20,000 Euro <strong>for</strong> a fully equipped 5litre<br />

standard stirred tank bioreactor. In contrast, the material costs <strong>for</strong> a 5litre<br />

temporary immersion vessel as used <strong>in</strong> our laboratory <strong>in</strong>clud<strong>in</strong>g all<br />

technical equipment <strong>for</strong> automated operation is only 50 Euro. Thus, our data<br />

show that the production of plant secondary metabolites <strong>in</strong> TIS represent an<br />

attractive alternative both compared to biomass production <strong>in</strong> the field or<br />

collected from nature as well as <strong>in</strong> comparison to the costly and often non<br />

economic production <strong>in</strong> bioreactor cell cultures.<br />

Acknowledgements<br />

The authors wish to thank the German M<strong>in</strong>istry <strong>for</strong> Education and<br />

Research and the Free State Saxony and the European Community <strong>for</strong><br />

f<strong>in</strong>ancial support. Per<strong>for</strong>mance of analyses and bioreactor cultures by SIAB<br />

(Saxon Institute of Applied Biotechnology) is also gratefully acknowledged.<br />

References<br />

Akula A, Becker D & Bateson M (2000) High-yield<strong>in</strong>g somatic embryogenesis and plant<br />

recovery <strong>in</strong> a selected tea clone, ‘TRI-2025’, by temporary immersion. <strong>Plant</strong> Cell Rep.<br />

19: 1140-1145<br />

Berl<strong>in</strong> J, Sieg S, Strack D, Bokern M & Harms H (1986) Production of betala<strong>in</strong>s by<br />

suspension cultures of Chenopodium rubrum. <strong>Plant</strong> Cell, Tiss. Org. Cult. 5: 163-174<br />

Bhojwani SS & Razdan MK (1996) <strong>Plant</strong> Tissue <strong>Culture</strong>: Theory and Practice, a revised<br />

edition. Elsevier, Amsterdam, Lausanne, New York, Ox<strong>for</strong>d, Shannon, Tokyo<br />

Charlwood BV & Rhodes MJC (1990) Secondary Products from <strong>Plant</strong> Tissue <strong>Culture</strong>.<br />

Clarendon Press, Ox<strong>for</strong>d<br />

De-Eknamkul W & Ellis B (1984) Rosmar<strong>in</strong>ic acid production and growth characterization of<br />

Anchusa offic<strong>in</strong>alis cell suspension cultures. <strong>Plant</strong>a Med. 50: 346-350<br />

Drapeau D, Blanch HW & Wilke CR (1987) Ajmalic<strong>in</strong>e, serpent<strong>in</strong>e, and catharanth<strong>in</strong>e<br />

accumulation <strong>in</strong> Catharanthus roseus bioreactor cultures. <strong>Plant</strong>a Med. 53: 373-376<br />

European Pharmacopeia (2002) 4th Edition, Council of Europe, 67075 Strasbourg Cedex,<br />

France 2001, ISBN: 92-871-4587-3: 183-184

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