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. 2020 May 4;10:7405. doi: 10.1038/s41598-020-64108-y

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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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The length increment of H. vernicosus shoots grown under artificial light without FR light addition (FR−) and added FR light (L1 FR+, L2 FR+) in cultivation units (Fig. 1) for 30 days (L2 FR+ had more blue light than L1 FR+, see methods for details). The shoots were exposed to VOCs produced by surrounding H. vernicosus individuals and to VOCs from S. flexuosum chamber (Sphagnum) or chamber without S. flexuosum (Control). The box and whiskers depict ± s.e. and minimum/maximum values, the numbers above depict number of inducer chamber/responder chamber/H. vernicosus replicates. The H. vernicosus growth increment increased significantly when the shoots were exposed to S. flexuosum VOCs (F_1,5 = 8.8, p = 0.031, tested across all light treatments; the experimental design and number of replicates did not allow to test the light treatments individually).