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Liquid Culture Systems for in vitro Plant Propagation

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494 Han Bouman & Annemiek Tiekstra<br />

small range of commercial available media is exam<strong>in</strong>ed, or various<br />

concentrations of a conventional medium, <strong>in</strong> particular MS (developed by<br />

Murashige and Skoog <strong>in</strong> 1962 <strong>for</strong> optimal growth of tobacco callus), are<br />

tested.<br />

In this paper, two other strategies <strong>for</strong> the modification of m<strong>in</strong>eral nutrient<br />

composition are <strong>in</strong>vestigated with Cymbidium and Gerbera: one is based on<br />

the elemental analysis of the plant species, and the other on the m<strong>in</strong>eral<br />

composition of hydroponic substrates used by growers. Growth on adapted<br />

media was compared with growth on normal-used MS (Murashige and<br />

Skoog, 1962) and DKW media (Driver and Kuniyuki, 1984). The latter<br />

medium was <strong>in</strong>cluded because the macro-elemental composition of DKWmedium<br />

is more similar to the composition of plants than MS-medium (see<br />

<strong>for</strong> examples tables 1 and 3). Henry et al. (1999) used a similar approach<br />

(adaptation accord<strong>in</strong>g to analysis of plant tissues) apply<strong>in</strong>g, however, only<br />

simple adaptations. They found a strong <strong>in</strong>crease of growth and of the<br />

production of secondary metabolites. Recently, Monteiro et al. (2000) and<br />

Cos Terrer and Frutos Tomas (2001) also used this approach with success.<br />

Earlier, Rug<strong>in</strong>i (1984) cultured olive cultivars us<strong>in</strong>g analytical data from<br />

develop<strong>in</strong>g shoots and embryos to <strong>for</strong>mulate the basal medium. In<br />

prelim<strong>in</strong>ary experiments based on elemental analysis of adult leaves, we also<br />

found improved growth and propagation <strong>for</strong> a number of plant species,<br />

<strong>in</strong>clud<strong>in</strong>g Gerbera, Cymbidium, apple and rose (Bouman et al., 2001;<br />

Bouman and Tiekstra, 2001).<br />

2. Material and methods<br />

2.1 <strong>Plant</strong> material<br />

<strong>Culture</strong>s of three Cymbidium cultivars and two Gerbera cultivars were<br />

k<strong>in</strong>dly provided, respectively by P+S <strong>Plant</strong>lab, Assendelft, Netherlands and<br />

by SBW International, Roelofarendsveen, Netherlands.<br />

2.2 Growth conditions<br />

Cymbidium was grown <strong>in</strong> 100 ml Erlenmeyer flasks with 20 ml medium<br />

on a gyratory shaker at 120 rpm at 22 °C, and 16 h light (30 µmol m -2 s -1 ).<br />

For each cycle, at least 15 Erlenmeyer flasks with 1.5 g protocorm material<br />

were used per medium. The plant material was weighed and visually<br />

evaluated after 3 weeks. Normally, these Cymbidium cultivars are grown <strong>in</strong><br />

half–strength MS macro- and micronutrients, 2 % (w/v) sucrose, MS<br />

vitam<strong>in</strong>s, pH 6.0 (accord<strong>in</strong>g to the tissue culture laboratory that had supplied

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