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. 2018 Jun 5;9:748. doi: 10.3389/fpls.2018.00748

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Copyright © 2018 Legner, Meinen and Rauber.

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) and the copyright owner 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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Root sampling scheme for all experiments. From every root, five root segments of 1 cm length were taken at the root basis (0%), the root tip (100%), the middle of the root (50%) and further two in between (25 and 75%). The FTIR-ATR spectra of the corresponding root position of one cultivar or provenience was used to calculate an arithmetic average (Av) which are labeled “Av_Cn_0%” in the figures. In the text, the abbreviation “Av-spectra” is used. Cn means cultivar number. See Table 2 for the number of roots used for the averages.