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. 2018 Sep 13;8:13746. doi: 10.1038/s41598-018-31700-2

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© The Author(s) 2018

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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Principal component analysis (PCA) of terpene leaf volatiles in the selected carrot genotypes, (A) PCA of the accumulation of monoterpenes. (B) PCA of the accumulation of sesquiterpenes. Carrot leaves were analyzed by GC-MS across the three years and environmental conditions (2014 Angers (Tunnel), 2015 Blagon (Field) and 2016 Ychoux (Field)). Codes correspond to genotype followed by the year of the experiment, for example “H14” corresponds to genotype H1 grown in summer 2014 in Angers under tunnel conditions. Confidence ellipses are designed with the “plotellipse” function of the factominer package of Rstudio.