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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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Experimental setup of (A) One of the Cultivation units inside the cultivation chamber (Fig. S1) and (B) VOCs sampling design. (A) Cultivation unit: The air was drawn through the inducer (Sphagnum flexuosum) or control (without S. flexuosum chamber to the four responder (Hamatocaulis vernicosus) chambers and pumped out of the cultivation chamber. H. vernicosus grew on floating mat bearing 15 holes, each accommodating three shoots of H. vernicosus. The four white circles in H. vernicosus plate indicate shoot triplets used for growth measurements. (B) VOCs sampling: The air was pumped through a charcoal filter over the moss carpet. Air enriched by VOCs was drawn through an adsorbent (Porapak tube) and then vented outside the cultivation chamber.