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. 2017 Aug 11;7:7937. doi: 10.1038/s41598-017-08465-1

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© The Author(s) 2017

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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Photosynthetic response of tea plants to elevated CO₂. (A) Net photosynthetic rate (Pn), (B) the quantum efficiency of photosystem II (Φ_PSII), false colour code depicted in the image ranges from 0 (black) to 1(purple), (C) maximum carboxylation rate of RuBisCO (V _cmax), (D) maximum rates of RuBP regeneration (J _max). Tea seedlings were exposed to either ambient (380 µmol mol⁻¹) or elevated CO₂ concentration (800 µmol mol⁻¹) for 24 days. Measurements were taken at different time-points as mentioned in the respective figures. The results are expressed as the mean values ± SD, n = 6.