Figure 3.

Effects of high CO₂ on Arabidopsis resistance to Pto and Botrytis cinerea. Col-0 was grown from seed in 16-h days at an irradiance of 200 µmol m⁻² s⁻¹ for 3 weeks either in air (400 µL L⁻¹; black symbols) or at high CO₂ (3,000 µL L⁻¹; white symbols) and then infected with Pto DC3000 or B. cinerea B05.10. A, Growth of Pto DC3000 in Col-0 leaves (left) and bacterial doubling time (right). cfu, Colony-forming units. B, Quantification of B. cinerea ACTIN A transcripts and photographs of infected leaves (left) and Arabidopsis PAD3 transcripts in control and treated plants in air (black triangles) and high CO₂ (hCO₂; white triangles). Data are means ± se of four (bacterial growth) or three (transcripts) biological replicates. Significant differences between the conditions at P < 0.05 are indicated by asterisks.