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Protocols for Micropropagation of Woody Trees and Fruits

Protocols for Micropropagation of Woody Trees and Fruits

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28<br />

S.S. KORBAN AND I.-W. SUL<br />

Seed. Following surface-sterilization, testae are removed, <strong>and</strong> a thin layer <strong>of</strong> axenic<br />

female gametophytes are excised from the embryo (Ball, 1987). These are introduced<br />

into petri plates containing a modified Murashige & Skoog (MS) medium containing<br />

2 µM BA <strong>and</strong> 2 µM kinetin. Within 2 months, organogenic callus is <strong>for</strong>med, <strong>and</strong><br />

following monthly subcultures, shoots are observed.<br />

Nodal stem segments. Each nodal stem explant is placed into a test tube containing<br />

Wolter & Skoog (WS) (1966) basal medium without any PGRs. Contaminated<br />

explants are discarded, <strong>and</strong> elongated healthy axillary shoots are excised, <strong>and</strong> cultured<br />

on a WS basal medium <strong>for</strong> further establishment as descrybed below.<br />

Figure 2. <strong>Micropropagation</strong> <strong>of</strong> S. sempervirens. Using greenhouse-grown mother plants as<br />

sources <strong>of</strong> nodal stem segments (A), these are then introduced in vitro, established, <strong>and</strong> proli-<br />

ferated (B). Following shoot proliferation medium, these are transferred to a fresh medium to<br />

elongate (C), <strong>and</strong> root spontaneously (D). Shoot buds (E, F) as well as somatic embryos (G, H)<br />

can also be induced on in vitro-grown needles.

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