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Table 4 Correlation between level of selective pressure dN/dS and level of gene expression

From: Rates of evolution in stress-related genes are associated with habitat preference in two Cardamine lineages

     C. impatiens C. resedifolia
Gene FCa n b mean (SE)c ρd P d ρd P d
Mean Expression        
   All genes 2922 8.72 (0.03) -- -0.249 **** -0.297 ****
   Cold response (CRG) 55 8.49 (0.21) NS -0.363 ** -0.310 *
   Cold (CGO) 56 10.16 (0.22) **** -0.199 NS -0.251 NS
   Photosynthesis (PGO) 67 10.29 (0.21) **** -0.203 NS -0.365 **
   Stress (SGO) 332 9.69 (0.09) **** -0.221 **** -0.209 ***
Maximum Expression        
   All genes 2922 11.02 (0.03) -- -0.185 **** -0.246 ****
   Cold response (CRG) 55 12.51 (0.20) **** -0.126 NS -0.190 NS
   Cold (CGO) 56 13.06 (0.24) **** -0.184 NS -0.097 NS
   Photosynthesis (PGO) 67 12.97 (0.21) **** -0.198 NS -0.367 **
   Stress (SGO) 332 12.26 (0.10) **** -0.083 NS -0.100 NS
  1. * Spearman correlation P < 0.05, ** P < 0.01, *** P < 0.001, **** P < 0.0001, NS = non significant.
  2. a Gene functional class.
  3. b Number of genes.
  4. c Mean/maximum expression was estimated for all genes and genes included in each functional class and tested (Wilcoxon test) against mean for genes not in that functional class.
  5. d Spearman's correlation between level of gene expression and ω estimated along the two Cardamine lineages.