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Liquid Culture Systems for in vitro Plant Propagation

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Chapter 21<br />

Norway spruce somatic embryogenesis: membrane rafts as<br />

a compromise between liquid and solidified media<br />

M. Vágner, Z. Vondráková, L. Fischerová & J. Opatrná<br />

Institute of Experimental Botany AS CR, Rozvojová 135, CZ-165 02 Prague 6,<br />

Czech Republic. E-mail: vagner@ueb.cas.cz<br />

Abstract: Embryogenic cultures of Norway spruce (Picea abies) were cultivated either on<br />

solidified media, <strong>in</strong> liquid media, or on polypropylene membrane rafts (LifeRaft). The<br />

cultivation on rafts was found to be the most successful way: the number of developed<br />

somatic embryos <strong>in</strong>creased, synchronization of the development was enhanced, and the time<br />

necessary <strong>for</strong> embryo development and maturation was shortened. It was shown that the<br />

process could be further improved by <strong>in</strong>sertion of a pre-maturation phase on PGR-free<br />

medium between proliferation and maturation steps. Germ<strong>in</strong>ation frequency rema<strong>in</strong>ed<br />

unchanged. PEG 4000 added to the maturation medium <strong>in</strong>creased the number of developed<br />

somatic embryos. PEG <strong>in</strong> lower concentration (1.87 % (w/v)) still had the significant<br />

beneficial effects on embryo numbers and development, but a decrease of germ<strong>in</strong>ation<br />

frequency or <strong>in</strong>creased aberrations of develop<strong>in</strong>g root and shoot were not found. On the other<br />

hand, PEG <strong>in</strong> the concentration 5 and 7.5 % (w/v) had a negative effect on the germ<strong>in</strong>ation of<br />

somatic embryos and, <strong>in</strong> sensitive cell l<strong>in</strong>e, 7.5 % (w/v) PEG decreased somatic embryo yield.<br />

Key words: conifer, membrane raft, Norway spruce, PEG, Picea abies, somatic<br />

embryogenesis<br />

Abbreviations: ABA-abscisic acid; 2,4-D - 2,4-dichlorophenoxyacetic acid; BAP - 6benzylam<strong>in</strong>opur<strong>in</strong>e,<br />

N6-benzyl-aden<strong>in</strong>e; IAA - <strong>in</strong>dole-3-acetic acid; PEG - polyethylene<br />

glycol; PGR - plant growth regulator<br />

1. Introduction<br />

The majority of cultivation protocols <strong>for</strong> somatic embryogenesis of<br />

different coniferous species use solidified media, at least <strong>for</strong> part of the<br />

process. The quality of somatic embryos grown on solidified medium is still<br />

higher than that of their counterparts cultivated <strong>in</strong> liquid medium;<br />

germ<strong>in</strong>ation frequencies thus differ considerably (Tautorus and Dunstan,<br />

295<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>, 295–302.<br />

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

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