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Liquid Culture Systems for in vitro Plant Propagation

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364 Anna Bach & Agata Ptak<br />

<strong>in</strong> regeneration of tulip bulblet derived from somatic embryos. It was<br />

observed that liquid medium <strong>in</strong>creased the number and fresh weight of<br />

‘Apeldoorn’ adventitious bulblets. Koster (1993) also demonstrated the<br />

quick development of tulip stolons and bulblets <strong>in</strong> liquid medium. Stolon<br />

<strong>for</strong>mation <strong>in</strong> tulip was observed <strong>in</strong> seedl<strong>in</strong>gs and small bulbs (Le Nard and<br />

de Hertogh, 1993) as well as <strong>in</strong> large bulbs, which grow <strong>in</strong> wet soil. This can<br />

expla<strong>in</strong> the <strong>for</strong>mation of stolons <strong>in</strong> liquid medium. It was also noticed that<br />

medium temperature of 25�C and white light applied to embryos prior<br />

<strong>in</strong>duction of bulb, strongly improved quality of bulblets. Such results, on the<br />

effect of light quality <strong>in</strong> the development of bulblets have not been reported<br />

until now. To <strong>in</strong>duce bulbs, embryos must be chilled (5�C) dur<strong>in</strong>g 12-weeksperiod<br />

<strong>in</strong> dark while the growth of bulbs was stimulated by liquid media, at<br />

25�C, <strong>in</strong> darkness. Our observation on the sequence of temperature, which<br />

was necessary <strong>for</strong> the development of tulip bulbs <strong>in</strong> embryo cultures<br />

confirmed previous data of bulb <strong>for</strong>mation <strong>in</strong> seedl<strong>in</strong>g grown <strong>in</strong> the field (Le<br />

Nard and De Hertogh, 1993). The results obta<strong>in</strong>ed <strong>in</strong>dicate that it is possible<br />

to control the process of tulip bulblet <strong>for</strong>mation <strong>in</strong> liquid medium and the<br />

quality of adventitious bulblets by the optimal temperature and light<br />

conditions <strong>in</strong> embryo cultures.<br />

References<br />

Bach A & Ptak A (2001) Somatic embryogenesis and plants regeneration from ovaries of<br />

Tulipa gesneriana L. <strong>in</strong> <strong>in</strong> <strong>vitro</strong> cultures. Acta Hortic. 560: 390-394<br />

Baker CM, Wilk<strong>in</strong>s HF & Ascher P D (1990) Comparison of precultural treatments and<br />

cultural condition on <strong>in</strong> <strong>vitro</strong> response of tulip. Acta Hortic. 266: 83-90<br />

Gude H & Dijkema M (1997) Somatic embryogenesis of tulip. Acta Hortic. 430: 275-300<br />

Koster J (1993) In <strong>vitro</strong> propagation of tulip. Thesis, Univ. of Leiden, The Netherlands<br />

Kuijpers AM & Langens-Gerrits M (1997) <strong>Propagation</strong> of tulip <strong>in</strong> <strong>vitro</strong>. Acta Hortic.<br />

430: 321-324<br />

Le Nard M & De Hertogh A (1993) Tulipa. In: The Physiology of Flower Bulbs.<br />

(pp. 617-683). Elsevier.<br />

Murashige T & Skoog F (1962) A revised medium <strong>for</strong> rapid growth and bioassays with<br />

tobacco tissue cultures. Physiol. <strong>Plant</strong>. 15: 473-479<br />

Nishiuchi Y (1979) Studies on vegetative propagation of tulip. Formation and development of<br />

adventitious buds <strong>in</strong> the excised bulb scale cultured <strong>in</strong> <strong>vitro</strong>. J. Japan. Soc. Hortic. Sci.<br />

48: 99-105<br />

Kim YS, Hahn EJ & Paek KY (2001) A large scale production of lilium bulblets through<br />

bioreactor culture. Acta Hortic. 560: 383-386<br />

Wright N & A Alderson PG (1980) The growth of tulip tissue <strong>in</strong> <strong>vitro</strong>. Acta Hortic.<br />

109: 263-270

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