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Ecotype screen for change in stomatal density (A) and mean guard cell length (B) of 17 ecotypes of A. thaliana (7 resistant and 10 susceptible to E. cichoracearum) grown under ambient (400 ppm) and elevated (800 ppm) CO2 concentrations: (A) arrow indicates Col-0 SD response to elevated CO2, n=70. (B) Student's t test of mean guard cell length, n=50, *P <0.05, NS, not significant between ambient and elevated CO2 concentration, bar, SEmean.
