Efficient In Vitro Callus Induction and Plant Regeneration Protocol for Different Polish Tomato Cultivars

The major goal of this research was to establish a stable regeneration system for tomato cultivars in order to lay the foundations for the future genetic transformation of the tomato. The regeneration ability of two kinds of explants (cotyledons and hypocotyl segments) was compared for three Polish cultivars of the tomato (Solanum lycopersicum). Explants were cultured on 10 different regeneration media (basal mediums MS or B5, and with a combination of 6-benzylaminopurine (BAP) and indole-3-acetic acid (IAA). It was found that the ability to regenerate was substantially dependent on the cultivars, as well as on the kind of explant. The best explants for inducing shoot regeneration were cotyledons, followed by hypocotyls. It was noticed that the best formulation of the medium for this regeneration from the two types of explants used in this study, is MS with 2 mg/L BA and 0.1 mg/L IAA. Tomato shoots were transferred to a ½ MS medium and ½ MS complemented with 0.1 mg/L IAA for rooting and all of them responded positively to the rooting medium.