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. 2020 Mar 19;10:4986. doi: 10.1038/s41598-020-61790-w

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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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Effect of intermittent exposures of CO₂ at 375 (ambient), 400, 500 and 600 ppm and S. fuliginea on the photosynthesis rate in cucurbits. The contrasts situated on the left side of the line of no difference show negative interaction (antagonistic), whereas the contrasts located on the right side of the line of no difference represent positive interaction (synergistic). The contrast on the farthest location shows highest interaction effects.