Table 1. Levels of nucleotide polymorphism in genes from five conifer species.

Gene set	Parameter	Nucleotide sites
		All	Non-coding	Coding
				All	Synonymous	Non-synonymous
105 genes from Picea glaucaa
	Number of sites	72 905	36 781	36 124	8459	27 665
	Number of segregating sites	1443	912	531	354	177
	Mean Watterson's θ	0.0051	0.0065	0.0035	0.0087	0.0012
	s.d. of Watterson's θ	0.0032	0.0050	0.0032	0.0094	0.0018
	Mean nucleotide diversity π	0.0043	0.0057	0.0030	0.0088	0.0013
	s.d. of nucleotide diversity π	0.0032	0.0055	0.0031	0.0099	0.0020
18 genes from Picea abiesb
	Number of sites	13 997	4887	9110	2089	7021
	Number of segregating sites	190	103	87	54	33
	Mean Watterson's θ	0.0032	0.0023	0.0027	0.0079	0.0013
	s.d. of Watterson's θ	0.0020	0.0028	0.0019	0.0068	0.0010
	Mean nucleotide diversity π	0.0021	0.0018	0.0017	0.0054	0.0009
	s.d. of nucleotide diversity π	0.0016	0.0018	0.0016	0.0056	0.0009
18 genes from Pinus taedac
	Number of sites	9836	4107	5729	1337	4392
	Number of segregating sites	198	109	89	49	40
	Mean Watterson's θ	0.0054	0.0069	0.0039	0.0078	0.0024
	s.d. of Watterson's θ	0.0035	0.0046	0.0031	0.0082	0.0021
	Mean nucleotide diversity π	0.0051	0.0068	0.0035	0.0077	0.0021
	s.d. of nucleotide diversity π	0.0036	0.0056	0.0033	0.0087	0.0023
14 genes from Pinus sylvestrisd
	Number of sites	12 288	3 921	8 367	1 887	6 480
	Number of segregating sites	147	77	70	44	26
	Mean Watterson's θ	0.0061	0.0060	0.0032	0.0087	0.0015
	s.d. of Watterson's θ	0.0070	0.0070	0.0028	0.0095	0.0015
	Mean nucleotide diversity π	0.0034	0.0066	0.0024	0.0076	0.0007
	s.d. of nucleotide diversity π	0.0040	0.0100	0.0029	0.0092	0.0008
121 genes from Pseudotsuga menziesii var. menziesiie
	Number of sites	59 173	—	—	—	—
	Number of segregating sites	933	478	455	254	201
	Mean Watterson's θ	0.0045	—	—	0.0079	0.0021
	s.d. of Watterson's θ	0.0033	—	—	0.0082	0.0028
	Mean nucleotide diversity π	0.0043	—	—	0.0076	0.0020
	s.d. of nucleotide diversity π	0.0036	—	—	0.0090	0.0030

^aData from this study.

^bSequence data from Heuertz et al. (2006). Four genes previously reported could not be included in the analysis because information on coding regions was not available.

^cSequence data from González-Martínez et al. (2006b).

^dSequence data from Pyhäjärvi et al. (2007). Two genes previously reported could not be included in the analysis because information on coding regions was not available.

^eSequence data from Eckert et al. (2009a).