Table 4.
Correlation between level of selective pressure dN/dS and level of gene expression
| 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 |
* Spearman correlation P < 0.05, ** P < 0.01, *** P < 0.001, **** P < 0.0001, NS = non significant.
a Gene functional class.
b Number of genes.
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.
d Spearman's correlation between level of gene expression and ω estimated along the two Cardamine lineages.