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Liquid Culture Systems for in vitro Plant Propagation

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Chapter 19<br />

Shoot regeneration from nodules of Charybdis sp.:<br />

A comparison of semisolid, liquid and temporary immersion<br />

culture systems<br />

Ch. Wawrosch*, A. Kongbangkerd, A. Köpf & B. Kopp<br />

Institute of Pharmacognosy, University of Vienna, Althanstr. 14, A-1090 Vienna, Austria.<br />

*requests <strong>for</strong> offpr<strong>in</strong>ts; Tel: +43-1-4277-55286; Fax: +43-1-4277-9552;<br />

E-mail: christoph.wawrosch@univie.ac.at<br />

Abstract: Nodules of Charybdis numidica ma<strong>in</strong>ta<strong>in</strong>ed <strong>in</strong> liquid Murashige and Skoog (MS)<br />

medium with 20 µmol BA <strong>in</strong> the dark were subjected to different treatments under cont<strong>in</strong>uous<br />

light <strong>for</strong> shoot regeneration. A high regeneration rate without hyperhydration of the shoots<br />

was observed on semisolid basal MS medium with 1 % sucrose. The use of liquid MS<br />

medium (1 % sucrose, no growth regulators) resulted <strong>in</strong> a significantly lower amount of<br />

shoots per gramme of nodules under both submerged and temporary immersion (TI)<br />

conditions. Shoot hyperhydration was lowest <strong>in</strong> a TI system with one 5 m<strong>in</strong> immersion every<br />

24 hours. When compared on a per conta<strong>in</strong>er base, large amounts of shoots could be produced<br />

<strong>in</strong> the TI system with less labour <strong>in</strong>put than <strong>in</strong> the system with semisolid medium.<br />

Key words: bufadienolides, Hyacynthaceae, hyperhydration, meristematic nodules,<br />

micropropagation, squill<br />

Abbreviations: AM – semisolid medium; BA – 6-benzyladen<strong>in</strong>e; LM – liquid medium; MS<br />

– Murashige and Skoog medium (1962); TI – temporary immersion<br />

1. Introduction<br />

The genus Charybdis (<strong>for</strong>merly Urg<strong>in</strong>ea, family Hyacynthaceae;<br />

common name: squill) comprises a number of bulbous, perennial species,<br />

which conta<strong>in</strong> a number of steroidal glycosides. Besides the centuries-old<br />

use aga<strong>in</strong>st heart diseases some of these compounds have other <strong>in</strong>terest<strong>in</strong>g<br />

biological activities. Scilliroside, found <strong>in</strong> Charybdis numidica, has a<br />

pronounced rodenticidal activity (Verbiscar et al., 1986). Recently it has<br />

been demonstrated that the glycoside proscillarid<strong>in</strong> A (Ch. maritima)<br />

275<br />

A.K. Hvoslef-Eide and W. Preil (eds.), <strong>Liquid</strong> <strong>Culture</strong> <strong>Systems</strong> <strong>for</strong> <strong>in</strong> <strong>vitro</strong> <strong>Plant</strong> <strong>Propagation</strong>, 275–280.<br />

© 2005 Spr<strong>in</strong>ger. Pr<strong>in</strong>ted <strong>in</strong> the Netherlands.

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