title: Histological study of embryo-like structures initiated from hypocotyl segments of flax (Linum usitatissimum L.).
abstract: Cultivation of flax hypocotyl segments on MS medium supplemented with auxin (2,4-D, NAA) and combination of auxin (NAA) and cytokinin (BAP, zeatin) resulted in production of callus on the cut ends of segments and prolonged cultivation in globular structures resembling early stages of somatic embryos. Embryo-like structures protruded on the surface directly from the subepidermal layers of hypocotyl segments. Despite these globular structures closely resembling somatic embryos, histological observations did not reveal their embryogenic character-organogenesis was the predominant developmental morphogenic pathway. Based on our experiments, as well as on critical revision of existing reports on flax somatic embryogenesis, we conclude, that there has not yet been convincing histological proof of somatic embyogenesis from flax hypocotyl segments.
authors.affiliation: Institute of Plant Genetics and Biotechnology, Slovak Academy of Sciences, Akademická 2, P.O. Box 39 A, SK-950 07 Nitra 1, Slovak Republic. nrgrsala@savba.sk
authors.forename: J
authors.initials: J
authors.lastname: Salaj
authors.forename: B
authors.initials: B
authors.lastname: Petrovská
authors.forename: B
authors.initials: B
authors.lastname: Obert
authors.forename: A
authors.initials: A
authors.lastname: Pret'ová
mesh_terms: D000383:Agriculture / Q000379:methods; D018929:Cell Culture Techniques / Q000379:methods; D002478:Cells, Cultured; D003583:Cytokinins / Q000494:pharmacology; D047108:Embryonic Development / Q000187:drug effects / Q000502:physiology; D019597:Flax / Q000166:cytology* / Q000187:drug effects / Q000196:embryology*; D018546:Hypocotyl / Q000166:cytology* / Q000187:drug effects / Q000196:embryology*; D007210:Indoleacetic Acids / Q000494:pharmacology; D038081:Organogenesis / Q000187:drug effects / Q000502:physiology; D019441:Plant Epidermis / Q000166:cytology / Q000187:drug effects / Q000196:embryology; D012639:Seeds / Q000166:cytology* / Q000187:drug effects / Q000196:embryology*
chemical_list: D003583:Cytokinins; D007210:Indoleacetic Acids