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. 2022 Mar 9;3:e6. doi: 10.1017/qpb.2021.19

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© The Author(s) 2022

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

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Figure 5. — Morphometric analysis of graminoid B. distachyon stomata significantly improves anatomical g _smax predictions. (a) Arabidopsis-like stoma and ellipse pore shape. (b) B. distachyon stomatal morphology traits measured; guard cell length (GCL), pore length (PL), pore width (PW), guard-cell width at the centre of the stomata (GCW_C), stomatal width at the apex (W _A) and pore depth (l). Pore area hand-traced (red) or geometrically defined as an ellipse (orange) or a rectangle (blue). (c) Linear relation between hand-traced pore area and ellipse pore area. (d) Linear relation between hand-traced pore area and rectangle multiplied by 0.9. (e) Linear relation of anatomical g _smax calculated with hand-traced pore area and with ellipse pore. (f) Linear relation of anatomical g _smax calculated with hand-traced pore area and with rectangle pore multiplied by 0.9. (g) Anatomical parameters measured using light microscopy; stomatal width at the apex (W _A) and GCL. (h) Anatomical maximum stomatal conductance (anatomical g _smax) equation as defined by Franks and Farquhar (2001) and B. distachyon adjustments to calculate a _max (0.9*PL*PW), PL (0.44*GCL), PW (0.13*GCL) and l (W _A*0.5). (i) Comparison between physiological g _smax, anatomical g _smax (light microscopy, LM) and anatomical g _smax (confocal microscopy, CM). (j) Comparison of anatomical g _smax calculated for summer, autumn and winter plants with stomatal anatomical traits represented in Supplementary Figure S3B,C. R ² and p values are indicated.