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. 2020 Jul 27;10:12464. doi: 10.1038/s41598-020-69373-5

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Diterpene resin acids and diterpene methyl esters detected in spruce GT extracts. Shown are total ion chromatograms of metabolite extracts from isolated GT (a), stems after trichomes have been removed (b), and needles (c). GT diterpene profiles contained major peaks of methylated diterpenes (blue shaded areas) including methyl palustrate (peak 1) methyl abietate (peak 4), methyl neoabietate (peak 5). GT also had several peaks of unknown diterpenes with m/z 330 (peaks 2, 3, and 6). Stem diterpene profiles were characterized by major peaks of diterpenes resin acids sandaracopimaric acid (peak 7), palustric acid (peak 8), isopimaric acid (peak 9), levopimaric acid (peak 10), and neoabietic acid (peak 11). Needle metabolite extracts only had trace amounts of diterpenes. Eicosene was used as internal standard (is). Methylated diterpenes and diterpene resin acids were identified with authentic standards.