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. 2021 Apr 29;12:596927. doi: 10.3389/fpls.2021.596927

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Copyright © 2021 Appolloni, Orsini, Pennisi, Gabarrell Durany, Paucek and Gianquinto.

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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Forest plot showing the combined effect sizes and main meta-analysis parameters of the investigated response ratios (Yield, Yield; TSS, soluble solid content; Asc, ascorbic acid content; Chl, chlorophyll content; PN, photosynthetic capacity; g_s, stomatal conductance; LA, leaf area). Numbers within brackets refer to k response ratios. The meta-analysis parameters are the effect size value (Hedges'g), low and high confidence intervals (CI), and tests of the null hypothesis (one-tailed p-value and z-value) (Hak et al., 2016).