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. 2016 Nov 4;132(1):13–66. doi: 10.1007/s11120-016-0318-y

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 3 — Factors affecting the relationship between the electron transport rate (ETR) and net photosynthesis (P _n) in apple. a P _n as a function of ETR for 21 apple (C3 plant) genotypes exposed to different drought stress conditions. The relation is nonlinear; b P _n as a function of a parameter (I _PL) based on ETR, leaf temperature and the leaf-to-air temperature difference and derived by a multivariate approach. This yielded a strongly linearly correlated relationship with a slope of nearly 1. (Figures a and b are adapted from Figs. 1d and 3 in Losciale et al. 2015)