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. 2021 Jan 15;11:609977. doi: 10.3389/fpls.2020.609977

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Copyright © 2021 Jin, Urbina, Heuvelink and Marcelis.

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(s) 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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Specific leaf area (SLA) of lettuce plants grown at three planting densities (23, 37, and 51 plants m^–2), with (52 μmol m^–2 s^–1) and without far-red radiation (FR) at 14 (A), 21 (B), and 28 (C) days after transplanting (DAT). Error bars indicate standard errors of means. For 14 DAT, a significant interaction between FR and planting density was observed (P = 0.027; n = 2). For 21 DAT, no significant interaction (P = 0.70) between effect of planting density (P = 0.59) and effect of FR (P = 0.26) was found. For 28 DAT, there was a significant interaction (P = 0.055; n = 3). Data are means of two (n = 2) or three blocks (n = 3) each with four–six replicate plants.