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Liquid Culture Systems for in vitro Plant Propagation

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Temporary immersion system: a new concept 169<br />

2.1 <strong>Systems</strong> with tilt<strong>in</strong>g or rocker mach<strong>in</strong>es<br />

Two mach<strong>in</strong>es were described by Harris and Mason (1983). The tilt<strong>in</strong>g<br />

mach<strong>in</strong>e <strong>in</strong>cl<strong>in</strong>es Erlenmeyers flasks 30 degrees <strong>in</strong> opposite directions; it has<br />

a capacity of 400 50-ml Erlenmeyer flasks or 320 125-ml flasks. The Rocker<br />

mach<strong>in</strong>e rolls 70 910-ml wide-mouth jars ly<strong>in</strong>g on their sides, or tilts 120<br />

455-ml wide-mouth jars stand<strong>in</strong>g upright 30-40 degrees every 30 sec. These<br />

mach<strong>in</strong>es do not <strong>in</strong>clude replenishment of the liquid culture medium.<br />

2.2 <strong>Systems</strong> with complete immersion and a liquid medium<br />

renewal mechanism<br />

Tisserat and Vandercook (1985) developed a large elevated culture<br />

chamber that was periodically dra<strong>in</strong>ed and then refilled with fresh medium<br />

<strong>in</strong> a sterile environment. The automated plant culture system (APCS,<br />

Figure 1A) consists of silicone tub<strong>in</strong>g, 2 impeller pumps, 2 glass medium<br />

reservoir bottles, a 3-way sta<strong>in</strong>less steel valve, a plant culture chamber, and<br />

an <strong>in</strong>terface module conta<strong>in</strong><strong>in</strong>g relay boards. This system provides a longterm<br />

method <strong>for</strong> <strong>in</strong> <strong>vitro</strong> plant culture.<br />

A<br />

Figure 1 A: Diagrammatic representation of semi-automatic temporary immersion systems:<br />

APCS system with complete immersion of plant material and renewal of the liquid culture<br />

medium [from Tisserat and Vandercook, 1985].

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