Fig. 1.

Microarray analysis of the number of genes whose expression are affected in P. patens gametophytes following a 7-day exposure to sub-ambient O₂ (13%), elevated CO₂ (1500 ppmV), and low O₂–high CO₂ compared to ambient CO₂ and O₂ level. (A) The number of transcripts exhibiting significant changes, relative to control ambient conditions (fold change ≥ 2; P ≤ 0.05, red and green indicates number of up- or down-regulated genes respectively) are indicated. (B) Numbers of P. patens transcripts homologous to Arabidopsis genes are indicated. (C) Venn diagram showing the number of P. patens genes commonly or exclusively up-regulated and (D) down-regulated in response to elevated CO₂ (1500 ppmV), sub-ambient O₂ (13%), and low O₂–high CO₂ compared to control ambient environment.