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Protocols for Micropropagation of Woody Trees and Fruits

Protocols for Micropropagation of Woody Trees and Fruits

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MICROPROPAGATION OF SEQUOIA SEMPERVIRENS<br />

3. Shoot elongation <strong>and</strong> spontaneous rooting: Healthy shoots with healthy<br />

needles are cut into 1 cm <strong>and</strong> culture in the jars containing ½ WS without<br />

PGR <strong>for</strong> 8 weeks. Spontaneous rooted shoots (about 20 to 30%) are transferred<br />

to the greenhouse <strong>for</strong> further shoot elongation <strong>and</strong> the rest <strong>of</strong> shoots<br />

can be segmented <strong>for</strong> in vitro proliferation (repeat step 2). Elongation <strong>of</strong><br />

shoots can be achieved when shoots are grown on WS basal medium only,<br />

however adding activated charcoal can help promote shoot elongation.<br />

Stage 1: Establishment <strong>of</strong><br />

explants<br />

Stage 2: Shoot<br />

proliferation<br />

Stage 3: Shoot<br />

elongation <strong>and</strong><br />

spontaneous rooting<br />

Spontaneous rooted<br />

shoots<br />

Greenhouse or field-grown plants <strong>of</strong> Sequoia<br />

Sempervirens<br />

Cut stem into 10 cm segments<br />

<strong>and</strong> sterilize with Clorox (10%)<br />

Culture stem segments vertically in test tubes<br />

containing WS medium w/o PGR<br />

Excise axillary shoots from stem<br />

segments<br />

Culture vertically in jars containing<br />

WS medium with zeatin (15 µM)<br />

Excise axillary shoots from<br />

stem segments<br />

Cut into 1 cm sections<br />

with 3 to 5 axillary buds<br />

Cut into 1 cm sections, each<br />

with 3 to 5 axillary buds<br />

Culture vertically in jars containing<br />

WS medium<br />

Greenhouse <strong>for</strong><br />

acclimatization<br />

Subculture <strong>for</strong> further shoot<br />

proliferation<br />

Discard contaminated<br />

stem segments<br />

Discard contaminated stem<br />

segments<br />

Repeat shoot<br />

proliferation<br />

4 weeks<br />

4 weeks<br />

8 weeks<br />

Figure 1. A schematic diagram <strong>of</strong> the overall micropropagation protocol <strong>for</strong> S. sempervirens<br />

using nodal stem segments.<br />

27

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