Table I.

Overrepresentation of stress-responsive genes in OGs that expanded in the Arabidopsis lineage and the major contributing duplication mechanisms

Statistical TestUp-RegulationDown-Regulation
Abiotic stress conditionsc
Biotic stress conditionsc
    P. infestans+T+T+T
  • a A + sign indicates that the ratio of stress-responsive genes in expanded OGs versus nonexpanded OGs is significantly higher (P ≤ 0.05) than for nonresponsive genes.

  • b T/N, Tandem versus nontandem; T, the genes responsive for a given stress condition are significantly enriched in tandem relative to nontandem genes; N, significant enrichment of nontandem genes (q < 0.05).

  • c Condition names follow those from AtGenExpress.