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. 2015 Dec 21;6:1130. doi: 10.3389/fpls.2015.01130

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Copyright © 2015 Kahlen and Chen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Measured climatic data of photosynthetic active radiation, PAR (μmol m⁻² s⁻¹) and mean daily temperature (°C, 24 h) inside the greenhouse in Experiment E1 (A). The vertical dashed line indicates the day, when the internodes at rank 5 had a length of ca. 3 cm. PAR4d (μmol m⁻² s⁻¹) is the mean PAR of 4 days starting 6 days before the internode has reached its maximum growth rate (B). T4d (°C) is the corresponding temperature data (C).