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Liquid Culture Systems for in vitro Plant Propagation

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Chapter 37<br />

Adaptions of the m<strong>in</strong>eral composition of tissue culture<br />

media on the basis of plant elemental analysis and<br />

composition of hydroponic substrates<br />

Han Bouman* & Annemiek Tiekstra<br />

Applied <strong>Plant</strong> Research, Wagen<strong>in</strong>gen UR, Group Tissue <strong>Culture</strong> and Biotechnology,<br />

P.O.Box 85, 2160 AB LISSE, The Netherlands.<br />

*Requests <strong>for</strong> offpr<strong>in</strong>ts: E-mail: Han.Bouman@wur.nl.<br />

Abstract: For the improvement of <strong>in</strong> <strong>vitro</strong> propagation protocols of Gerbera and<br />

Cymbidium, we adapted the macronutrients accord<strong>in</strong>g to the elemental composition of adult<br />

leaves. In comparison with normally used media, <strong>in</strong> particular, the Ca and P concentrations<br />

were much higher. Us<strong>in</strong>g the adapted media, <strong>for</strong> both crops growth was much improved. The<br />

relative concentrations of macronutrients <strong>in</strong> these modified media <strong>for</strong>mulations is much more<br />

<strong>in</strong> accordance with the m<strong>in</strong>eral composition of nutrient solutions used <strong>in</strong> hydroponic cultures.<br />

For Gerbera, we also made adaptations to the micronutrients accord<strong>in</strong>g to the elemental<br />

composition of nutrient media <strong>in</strong> hydroponics (viz., <strong>in</strong>creased Cu-content and decreased Mncontent).<br />

This resulted <strong>in</strong> additional improvement of growth; by this adaptation, the plants<br />

became larger and also greener (only with the Cu adaptation).<br />

Key words: Cymbidium, Gerbera, hydroponics, m<strong>in</strong>eral nutrients<br />

Abbreviations: CAM – Cymbidium adapted medium; DKW – Driver and Kuniyuki walnut<br />

medium (1984); DW-dry weight; FW – fresh weight; GAM – Gerbera adapted medium; MS<br />

– Murashige and Skoog medium (1962)<br />

1. Introduction<br />

For the development of <strong>in</strong> <strong>vitro</strong> propagation protocols, most usually,<br />

research is carried out to obta<strong>in</strong> optimal aux<strong>in</strong> and cytok<strong>in</strong><strong>in</strong> concentrations.<br />

Modify<strong>in</strong>g the m<strong>in</strong>eral composition of the medium is an alternative or<br />

additional strategy to improve propagation, but exam<strong>in</strong><strong>in</strong>g dose-response<br />

curves <strong>for</strong> the various elements and their <strong>in</strong>teractions to identify optimal<br />

concentrations is excessively time-consum<strong>in</strong>g. There<strong>for</strong>e, usually, either a<br />

493<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>, 493–505.<br />

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

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