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. 2018 Dec 18;8:17936. doi: 10.1038/s41598-018-36302-6

Figure 2.

Figure 2

Biochemical characterization of the newly identified poplar root terpene synthases PnTPS4 (A), PtTPS16 (B), and PtTPS21 (C). The genes were heterologously expressed in E. coli and partially purified proteins were incubated with GPP as substrate. Enzyme products were analyzed using GC-MS. 1, α-thujene; 2, α-pinene*; 3, camphene*; 4, sabinene; 5, β-pinene*; 6, myrcene; 7, α-phellandrene; 8, α-terpinene*; 9, β-phellandrene; 10, limonene*; 11, ocimene; 12, γ-terpinene*; 13, terpinolene; 14, 1.8-cineole; 15, fenchyl alcohol. Compounds marked with * were identified by comparison of retention time and mass spectrum to those of authentic standards. Others were identified by database comparisons.