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. Author manuscript; available in PMC: 2013 Aug 7.
Published in final edited form as: Plant J. 2011 Nov 23;69(4):655–666. doi: 10.1111/j.1365-313X.2011.04820.x

Figure 6. Genetic mapping of α- and δ-amyrin synthesis.

Figure 6

(a) Relative contribution of triterpenoid isomers to the total cuticular triterpenoids for 51 S. habrochaites introgression lines in a S. lycopersicum background. LA3917 (indicated by *) had no detectable α- or δ-amyrin. (b) The genetic architecture of LA3917. The introgressed segments surrounding the markers TG59 and TG180 are uniquely represented in this line (shaded in red). The latter segment contains the tandem loci SlTTS1 and SlTTS2 that encode the two triterpene synthases of S. lycopersicum. (c) The isomer specificity of the two triterpene synthases of S. lycopersicum, SlTTS1 and SlTTS2. SlTTS1 synthesizes β-amyrin exclusively while SlTTS2 synthesizes primarily δ-amyrin and lesser amounts of α- and β-amyrin.