Table 4

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

C. impatiens

C. resedifolia



Gene FCa

nb

mean (SE)c

ρd

Pd

ρd

Pd


    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.

Ometto et al. BMC Evolutionary Biology 2012 12:7   doi:10.1186/1471-2148-12-7

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