Micropropagation of Pinus taeda by axillary bud proliferation technique and anatomical study of
adventitious roots were studied. Apical and basal segments were established in vitro in Murashige and
Skoog (MS) culture medium. For multiple shoot induction, the explants were transferred to WV3
medium with or without 6-benzylaminopurine (BAP) (0.12, 0.25 or 0.50 µM). The effect of the culture
medium and combinations of α-naphthalene acetic acid (NAA) with BAP on adventitious rooting were
evaluated. The basal segments exhibited higher multiplication rates (3.7 shoots per explant) than apical
segments during establishment of in vitro culture. The best rooting rate (40%) was achieved by
induction of roots in water-agar (WA) culture medium supplemented with 2.69 µM NAA and 0.44 µM
BAP, for 9 days, followed by transfer into GDm/2 medium. Adventitious roots can be derived from the
cambium cells, from adventitious meristem, or from a callus developed at the base of the shoots. When
formed indirectly, roots can be derived from peripheral cells of the callus. In treatment resulting in the
best rooting rate, 58.3% of the roots were formed directly. The callus formation at stem basis did not
prevent rooting and did not impair acclimatization. The plantlets were successfully acclimatized with
90% survival.
Key words: Loblolly pine, apical segment
Micropropagation of Pinus taeda by axillary bud proliferation technique and anatomical study ofadventitious roots were studied. Apical and basal segments were established in vitro in Murashige andSkoog (MS) culture medium. For multiple shoot induction, the explants were transferred to WV3medium with or without 6-benzylaminopurine (BAP) (0.12, 0.25 or 0.50 µM). The effect of the culturemedium and combinations of α-naphthalene acetic acid (NAA) with BAP on adventitious rooting wereevaluated. The basal segments exhibited higher multiplication rates (3.7 shoots per explant) than apicalsegments during establishment of in vitro culture. The best rooting rate (40%) was achieved byinduction of roots in water-agar (WA) culture medium supplemented with 2.69 µM NAA and 0.44 µMBAP, for 9 days, followed by transfer into GDm/2 medium. Adventitious roots can be derived from thecambium cells, from adventitious meristem, or from a callus developed at the base of the shoots. Whenformed indirectly, roots can be derived from peripheral cells of the callus. In treatment resulting in thebest rooting rate, 58.3% of the roots were formed directly. The callus formation at stem basis did notprevent rooting and did not impair acclimatization. The plantlets were successfully acclimatized with90% survival.Key words: Loblolly pine, apical segment
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