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. 2017 Aug 17;7:8542. doi: 10.1038/s41598-017-08428-6

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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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Changes in fluorescence parameters from slow Chl a fluorescence transients of nitrogen-starved P. cruentum. (A) Variation in the maximum photochemical efficiency of PSII (Fv/Fm), activity of PSII reaction centers (Fv/Fo), effective photochemical efficiency (ΦPSII), and light-adapted maximum photochemical efficiency of PSII (Fv’/Fm’) after nitrogen deficiency. (B) Variation in the efficiency of the OEC of PSII (Fo/Fv) after nitrogen deficiency.