title: Production of marker-free transgenic Nierembergia caerulea using MAT vector system.
abstract: Agrobacterium tumefaciens strain EHA105 harboring an ipt-type MAT vector, pNPI132, was used to produce morphologically normal transgenic Nierembergia caerulea cv. Mont Blanc employing ipt gene as the selectable marker gene. beta-glucuronidase (GUS) gene was used as model gene of interest. The MAT vector system is a positive selection system that gives the advantage of regeneration to the transgenic cells without killing the non-transgenic cells. Infected explants were cultured on hormone- and antibiotic-free MS medium, and 65% of the regenerated shoots developed ipt shooty phenotype-morphologically abnormal shoots, within approximately 3 months after co-cultivation. Twenty morphologically normal shoots were produced from 12 transgenic ipt shoots 7 months after co-cultivation. The normal shoots rooted well on hormone-free MS medium. Ninety percent of the normal shoots were ipt (-), GUS(+) and excision(+) as determined by PCR and Southern blot analyses. These results indicate that ipt-type MAT vector system can be used successfully in Nierembergia to produce marker-free transgenic plants without using phytohormones and selective chemical agents.
authors.affiliation: Laboratory of Plant Cell Technology, Faculty of Horticulture, Chiba University, 648 Matsudo, Matsudo City, Chiba 271-8510, Japan.
authors.forename: Raham Sher
authors.initials: RS
authors.lastname: Khan
authors.forename: Dong Poh
authors.initials: DP
authors.lastname: Chin
authors.forename: Ikuo
authors.initials: I
authors.lastname: Nakamura
authors.forename: Masahiro
authors.initials: M
authors.lastname: Mii
mesh_terms: D016960:Agrobacterium tumefaciens; D005819:Genetic Markers / Q000235:genetics; D005822:Genetic Vectors / Q000235:genetics*; D030821:Plants, Genetically Modified; D019657:Solanaceae / Q000235:genetics* / Q000502:physiology; D014170:Transformation, Genetic
chemical_list: D005819:Genetic Markers