| In vitro propagation of conifers is generally
only possible with sections of embryos (A) or young germinants (B). Thus
in vitro propagation capability is already lost in young seedlings
(C), but these can still be propagated by conventional rooting or cutting
techniques. Cuttings taken from these seedling's root readily and generally
produce true-to-type propagules. Cuttings from a somewhat older tree (D)
have a reduced rooting capacity, and the propagules often show varying
degrees of plagiotropic growth. Cuttings from mature trees (E) do not root.
(Bonga and Durzan, 1982)
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