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. 2020 Feb 14;10:2654. doi: 10.1038/s41598-020-59638-4

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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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Leaf gas exchanges and chlorophyll a fluorescence in maca plants grown under UV-transmitting and -blocking filters. Parameters of CO₂ assimilation rate (a), intercellular CO₂ concentration (b), stomatal conductance (c), transpiration rate (d) and F_v/F_m (e) were evaluated in 4- and 7-month-old plants grown under mountain ecosystem. Error bars represent the standard error of the mean (n = 3). The P-values indicate the significance of the effects of treatment (UV), plant age (Age) and their interaction (UV*Age), all calculated from a two-way ANOVA. Differences between means are indicated by different letters (P < 0.05). Control, UV-transmitting filter. UV-block, UV-blocking filter.