Stomatal responses of differently CO2-acclimated plants to natural and experimental CO2 gradients
Fig 5
Stomatal frequency (SF) response to variations in pCO₂.
Stomatal density (SD; A, n = 836) and stomatal index (SI; B, n = 828) were determined for high-altitude taxa (“high”; altitude of origin 2’970 m a.s.l.), i.e., Anthyllis vulneraria subsp. valesiaca and Arabis alpina, and for low-altitude taxa (“low”; 540 m a.s.l.), i.e., Anthyllis vulneraria subsp. carpatica and Arabidopsis thaliana (Col-0). All plants were cultivated under reduced (30 Pa) and ambient pCO₂ (42 Pa). Marginal means along with their 95% confidence intervals are presented. Statistical analysis results are provided in S6 Table. Different letters denote statistically significant differences at p < 0.05, as determined by post hoc tests.