BMC Ecology and Evolution

Table 4 Correlation between level of selective pressure d_N/d_S 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 FC^a	n ^b	mean (SE)^c		ρ^d	P ^d	ρ^d	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.

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