Abstract
Somatic embryogenesis in Pinus thunbergii was initiated from megagametophytes containing immature zygotic embryos. Embryogenic cultures were maintained and proliferated in medium supplemented with 2,4-dichlorophenoxyacetic acid and 6-benzylaminopurine. High maturation frequencies of somatic embryos were obtained on maturation media containing maltose, activated charcoal, abscisic acid, and polyethylene glycol as osmotic agent. The best result among the cell lines tested was achieved with the cell line T-205-3. More than 900 somatic embryos per petri dish, on average, were obtained after about 8 weeks of culture on maturation medium. Sixty percent of somatic embryos tested germinated after transfer to plant growth regulator-free medium and then 85% of them converted into plantlets.
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