Upstream regulatory fragments of three monoterpene biosynthesis genes, including PbGDPS, PbTPS5, and PbTPS10, were isolated from P. bellina genomic DNA by use of the Universal GenomeWalker Kit (Clontech, USA) as previously described (Hsu et al. 2014 (link)). In addition, we also isolated 1.5-kb upstream regulatory fragments of the identified six TFs involved in the regulation of floral monoterpene biosynthesis in P. bellina (Chuang et al. unpublished) from P. equestris genomic sequences (Cai et al. 2015 (link)). The cis-elements related to light signaling and circadian clock on the upstream regulatory fragments of both monoterpene biosynthesis genes and TFs were predicted by using PlantPAN (Chow et al. 2015 (link)). The predicted results with 100% similar score were accepted.
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