title: High efficiency callus induction and plant regeneration in petiole culture of four poplar genotypes.
abstract: In order to develop a simple and feasible approach to achieve high frequency plant regeneration for protoplast isolation and transformation experiments, a method was elaborated by using a new type of explant (petiole segments) for the four Populus nigra genotypes. Callus initiation from the petioles took place on N6 medium containing 2,4-D (0.1-1 mg/l). The highest rate of callus initiation (100%) was achieved when the basic medium was supplemented with 0.5 mg/l of 2,4-D, in all tested genotypes. For shoot regeneration, calli were transferred to MS and WPM medium supplemented with BA (1.0-2.5 mg/l) and NAA (0.2 mg/l). Multiple shoot regeneration was observed in each shoot induction medium. The highest rate of shoot regeneration (6.83 shoot/callus) was observed on MS medium containing 2.5 mg/l BA and 0.2 mg/l NAA. The results showed highly significant differences between the media. There was no significant difference between the genotypes and genotype x medium interaction.
authors.affiliation: Gödöllõ University of Agricultural Sciences, Department of Genetics and Plant Breeding, Hungary.
authors.forename: M A
authors.initials: MA
authors.lastname: Jafari
authors.forename: J
authors.initials: J
authors.lastname: Kiss
authors.forename: J
authors.initials: J
authors.lastname: Gergácz
authors.forename: L E
authors.initials: LE
authors.lastname: Heszky
mesh_terms: D003470:Culture Media; D005838:Genotype; D018521:Plant Physiological Phenomena; D010944:Plants / Q000235:genetics*; D011523:Protoplasts; D012038:Regeneration / Q000235:genetics; D014170:Transformation, Genetic; D014197:Trees / Q000235:genetics / Q000502:physiology
chemical_list: D003470:Culture Media