Fig. 2From: Effect of explant type (leaf, stem) and 2,4-D concentration on callus induction: influence of elicitor type (biotic, abiotic), elicitor concentration and elicitation time on biomass growth rate and costunolide biosynthesis in gazania (Gazania rigens) cell suspension culturesCallus obtained from Gazania rigens explants after 4 weeks of incubation: a callus from stem explant with 1.5Â mg/L 2,4-D, b callus from leaf explant with 1.0Â mg/L 2,4-D, and c callus from control treatment (2,4-D-free)Back to article page