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. 2015 Apr 28;6:256. doi: 10.3389/fpls.2015.00256

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Copyright © 2015 Subramanian, Han, Dutilleul and Smith.

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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Means and SE of corn root system traits measured for optimal (Control) and salt-stress (Salt) treatment groups: (A) fractal dimensions (FD) in Weeks 1–3 (only for lower-root systems; see Table 1); (B) fractal dimension ratios (FDR; i.e., against Week 1); (C) root volumes in Weeks 1–3 (for lower- and upper-root systems); (D) relative growth rates (i.e., relative to the previous week and calculated using volumes of lower and upper roots combined); (E) root lengths in Weeks 1–3 (for lower- and upper-root systems); and (F) length increments (i.e., between successive weeks and calculated using root lengths of lower- and upper-root systems combined).