title: Antiauxin enhanced microshoot initiation and plant regeneration from epicotyl-originated thin-layer explants of sugarbeet (Beta vulgaris L.).
abstract: An in vitro method was developed for microshoot initiation from thin-layer explants prepared from the elongated epicotyls of sugarbeet (Beta vulgaris L.). Intact epicotyls of 14-day-old seedlings were excised from the hypocotyls above the cotyledons and allowed to elongate on De Greef and Jacobs (1979) medium supplemented with 0.2 mg/l 6-benzyladenine, 0.2 mg/l gibberellic acid and 0.1 mg/l indole-3-acetic acid in darkness. After a 21-day-incubation, the elongated epicotyls were halved to obtain apical and basal segments prior to removing the leaves and lateral buds. Subsequently, 5-8 mm long, 2-3 mm wide and 0.8-1.0 mm thick tangential sections were prepared longitudinally from the exterior parts of the halved epicotyls. These thin-layer explants were incubated on microshoot initiating media containing various growth regulators. The combination of 1.0 mg/l 6-benzyladenine and the antiauxin 2,3,5-triiodobenzoic acid (1.0 mg/l) resulted in maximum microshoot development (6.3±0.2 microshoots/thin-layer explant). The final efficiency of our tissue culture system was significantly increased by the NaCl (100 mg/l) initiated in vitro rooting of microshoot originated plantlets.
authors.affiliation: Agricultural Biotechnology Center, Institute for Plant Sciences, P.O. Box 411, H-2101, Gödöllő, Hungary.
authors.forename: O
authors.initials: O
authors.lastname: Toldi
authors.forename: G
authors.initials: G
authors.lastname: Gyulai
authors.forename: J
authors.initials: J
authors.lastname: Kiss
authors.forename: I A
authors.initials: IA
authors.lastname: Tamás
authors.forename: E
authors.initials: E
authors.lastname: Balázs