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Root morphology (a), and root length, number of root tips, root surface area, and root/shoot ratio (b) of 5-week-old wild-type Arabidopsis grown for 7 d in P-deficient nutrition solutions containing NO3 − or NH4 + exposed to ambient CO2 (350±50 µl l–1) or elevated CO2 (800±50 µl l–1). Data are means ±SD (n=8) of two independent experiments. Asterisks indicate that the mean values are significantly different between the ambient and elevated CO2 treatments (P <0.05).
