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. 2020 Dec 14;72(5):1962–1977. doi: 10.1093/jxb/eraa584

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© The Author(s) 2020. Published by Oxford University Press on behalf of the Society for Experimental Biology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 3. — Relationships between A_op and DW values. (A) Mixed model-derived relationships (lines) and 95% confidence levels (shaded bands) between aboveground dry biomass productivity (DW) and operational photosynthetic rate at average incident light intensity (A_op) under current ambient (black line, y=15.26 + 0.54x, P=0.006, marginal R²=0.04) and high CO₂ (grey line, y=11.57 + 1.22x, P<0.001, marginal R²=0.05) conditions. Black and grey filled circles represent measured values from individual plants grown under current ambient and high CO₂, respectively. (B) Relationship (solid line) and 95% confidence levels (shaded band) between mean changes in DW and A_op across genotypes under high CO₂ relative to current ambient CO₂ values (y=6.73 + 1.11x, P=0.070, R²=0.09). Dashed reference lines denote zero change in either A_op or DW. Data points are means ±SE per genotype, and different colours represent different accession status or species. Correlations between ranked mean DW (C) and A_op (D) data under current ambient and high CO₂ conditions (pooled DW data, black solid line, R²=0.63, Spearman’s rank correlation coefficient=0.80; pooled A_op data, black solid line, R²=0.09, Spearman’s rank correlation coefficient=0.29). Data points in (C) and (D) represent current ambient and high CO₂ rankings based on mean values per genotype, and different colours denote different accession status or species. Relationships for each group of genotypes are also shown. All relationships in (C) are significant (cultivars, P=0.004; wild, P<0.001; semi-natural, P=0.04; pooled data, P<0.001), while all relationships in (D) are non-significant (cultivars, P=0.22; wild, P=0.35; semi-natural, P=0.48; pooled data, P=0.12). The dashed 1:1 line is added for reference.