Research article

Micropropagation of an endangered species Pinus armandii var. Amamiana

Katsuaki Ishii , Yoshihisa Hosoi, Emilio Maruyama, Sei-ichi Kanetan

Katsuaki Ishii
Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba, Ibaraki 305-8687, Japan. Email: katsuaki@ffpri.affrc.go.jp
Yoshihisa Hosoi
Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba, Ibaraki 305-8687, Japan
Emilio Maruyama
Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba, Ibaraki 305-8687, Japan
Sei-ichi Kanetan
Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba, Ibaraki 305-8687, Japan

Online First: May 16, 2007
Ishii, K., Hosoi, Y., Maruyama, E., Kanetan, S. 2007. Micropropagation of an endangered species Pinus armandii var. Amamiana. Annals of Forest Research 51(1): 5-10.


For micropropagation via organ culture, mature embryos were excised from the seeds of Pinus armandii. Franch. var. amamiana (Koidz.) Hatusima, an endangered species only inhabiting the south west islands of Japan. Adventitious buds were induced on the surface of the embryo on 1/2 DCR medium containing BAP, and they grew shoots after subculturing to medium containing activated charcoal or a low concentration of thidiazuron. From the elongated shoots, root primordia and roots were induced in medium containing IBA as an auxine. We found that a low concentration of zeatin or BAP added to the medium was beneficial for plant regeneration of mature embryos of this species. For micropropagation via somatic embryogenesis, embryogenic cell suspensions were induced from a mature and immature seed of P. armandii var. amamiana on MS liquid medium supplemented with 1 ľM 2, 4-D and 3 ľM BAP. The suspensions were incubated in the dark at 250. Induced suspension cells were transferred to ammonium free MS liquid medium supplemented with 1 ľM 2, 4-D, 3 ľM BAP and 30m M L-glutamine and subcultured every 2 weeks. In the other set of the experiment, the induction rate of somatic embryogenesis was high with ammonium free half strength MS medium. In order to develop somatic embryos, the suspension cells were transferred to ammonium free MS medium supplemented with 10 ľM ABA, 0.2% activated charcoal, 10% PEG (MW6000), 30m M L-glutamine and 6% maltose. The cultures were incubated under a 16h light/8h dark photoperiod. After 1-2 months of culture, differentiation of embryos progressed and cotyledonary embryos were obtained. These embryos were transferred on ammonium free MS solid medium under 16 h photoperiod. After 2-3 weeks plantlets with roots and green cotyledons were obtained. Plantlets were transplanted to vermiculite containing modified MS liquid medium in 200 ml culture flasks, then out planted after habituation procedure.

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  • Katsuaki Ishii
  • Yoshihisa Hosoi
  • Emilio Maruyama
  • Sei-ichi Kanetan
  • Katsuaki Ishii
  • Yoshihisa Hosoi
  • Emilio Maruyama
  • Sei-ichi Kanetan