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Protocols for Micropropagation of Woody Trees and Fruits

Protocols for Micropropagation of Woody Trees and Fruits

Protocols for Micropropagation of Woody Trees and Fruits

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488<br />

M. BERUTO AND P. CURIR<br />

Figure 7. Multiplication rate <strong>of</strong> different tree peony cultivars grown on WPM2 <strong>and</strong> scored at<br />

the end <strong>of</strong> the first subculture (16 weeks <strong>of</strong> culture).<br />

2.2.1. Steps in the Procedure<br />

1. Isolate the in vitro shoots <strong>for</strong>med by transverse section <strong>and</strong> subsequently<br />

separate them (Figure10A).<br />

2. Place the in vitro shoots onto fresh WPMP2 medium (test tubes firstly, then<br />

vessel culture (∅ 7.5 cm; 320 mL) sealed with polycarbonate lid <strong>and</strong> a polyethylene<br />

film (Domopack; 10 mL <strong>and</strong> 100 mL <strong>of</strong> medium respecttively)<br />

<strong>and</strong> incubate at 19 ± 1°C under a 12 h photoperiod with 50 µmol m –2 s –1<br />

light provided by fluorescent lamps (TLD 36W/33 Philips) (Figure 10B).<br />

3. After 1 day, browning exudates from the explants are released to medium;<br />

plantlets are transferred without any cutting to a fresh WPMP2 medium<br />

(tubes or vessels) <strong>and</strong> incubated further.<br />

4. A new transfer <strong>of</strong> the plant material is made every 7 to 8 weeks to achieve<br />

further multiplication. The multiplication rate (MR) represents the mean<br />

number <strong>of</strong> usable shoots <strong>for</strong> the following subculture, acquired from one<br />

explant. The shoots to be utilized are the initial ones <strong>and</strong> their axillary<br />

shoots; hyperhydrous plantlets are discarded.

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