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Liquid Culture Systems for in vitro Plant Propagation

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512 E. Gontier et al.<br />

2. Materials and methods<br />

2.1 <strong>Plant</strong> material and culture media<br />

Ruta graveolens shoot cultures were <strong>in</strong>itiated from sterile seedl<strong>in</strong>g (seeds<br />

provided by Ets Bertrand Frères SA, Orléans, France) as previously<br />

described (Massot et al., 2000). The plant material stock was cultivated <strong>in</strong><br />

250 ml Erlenmeyer flasks conta<strong>in</strong><strong>in</strong>g 100 ml of B5 (Gamborg et al., 1968)<br />

medium conta<strong>in</strong><strong>in</strong>g 9 µmol (2 mg l -1 ) of 2,4-D and k<strong>in</strong>et<strong>in</strong> and 30 g l -1 of<br />

sucrose. This medium – called B5(30)K2D2 – was used <strong>for</strong> all experiments,<br />

except <strong>in</strong> the case of sucrose trials where sucrose was lowered to 10 g l -1<br />

(then: medium called B5(10)K2D2 ).<br />

Arbitrary mark (AM)<br />

Air out<br />

Air <strong>in</strong><br />

T° pH pO2<br />

Peristaltic pump<br />

0.22µm<br />

filter<br />

B<br />

Warmed air <strong>for</strong> Balance<br />

temperature<br />

regulation<br />

A: 4-litre Setric Génie IndustrielTM Temperature jacket filled<br />

with T° controlled air<br />

Bioreactor<br />

connected to a 5-litre Schott flask<br />

(Bioreactor 1)<br />

Autoprim<strong>in</strong>g<br />

siphon<br />

Air out<br />

Air <strong>in</strong><br />

1<br />

B<br />

B: Bioreactor <strong>for</strong><br />

permament Immersion<br />

(Bioreactor 2)<br />

2<br />

Air out<br />

A<br />

B<br />

C: Bioreactor <strong>for</strong><br />

temporary Immersion<br />

c2 (Bioreactor 3)<br />

Timer<br />

Air <strong>in</strong> Aquarium<br />

air pump<br />

c1<br />

B C<br />

Figure 2: Scheme of the different bioreactors tested <strong>in</strong> these experiments.

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