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Liquid Culture Systems for in vitro Plant Propagation

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504 Han Bouman & Annemiek Tiekstra<br />

5. Conclusion<br />

The advantages of us<strong>in</strong>g media adapted <strong>for</strong> specific crops <strong>in</strong>stead of<br />

general media such as MS are clear: us<strong>in</strong>g media adapted accord<strong>in</strong>g to the<br />

elemental composition of plant tissue or of nutrient solutions <strong>in</strong> hydroponics,<br />

substantial improvements <strong>for</strong> <strong>in</strong> <strong>vitro</strong> propagation of two species have been<br />

made. Us<strong>in</strong>g this approach, improvements were also found <strong>for</strong> <strong>in</strong> <strong>vitro</strong><br />

propagation of other species <strong>in</strong>clud<strong>in</strong>g rose, apple and Dahlia. Often the<br />

effect was more profound after the <strong>in</strong> <strong>vitro</strong> phase; e.g., rose plantlets grew<br />

much better after micro-elemental adaptations, although no significant<br />

differences were found dur<strong>in</strong>g the <strong>in</strong> <strong>vitro</strong> phase.<br />

We conclude that it can be valuable <strong>for</strong> improvement of <strong>in</strong> <strong>vitro</strong><br />

propagation to apply the strategy of adapt<strong>in</strong>g the m<strong>in</strong>eral content of tissue<br />

culture media to the elemental analysis of the plant. If the species is grown<br />

<strong>in</strong> hydroponics, adaptations derived from hydroponic substrate composition<br />

can have very beneficial effects too.<br />

Acknowledgements<br />

PT Trade Board <strong>for</strong> Horticulture and The M<strong>in</strong>istry <strong>for</strong> Agriculture,<br />

Nature Management and Fisheries supported this research. We thank B.<br />

Morris <strong>for</strong> technical assistance, and G.J de Klerk <strong>for</strong> read<strong>in</strong>g the manuscript.<br />

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