Table 4.

Overall numbers (±SE) of substitutions per site (K_o) for six plant mitochondrial exons and introns

Gene*	Sites for introns, n†	Numbers of substitutions per site
		Within monocots		Within dicots		Between monocots and dicots
		Exons	Intron	Exons	Intron	Exons	Intron
coxII	771	0.006  ± 0.003	0.010  ± 0.003	0.042  ± 0.008	0.042  ± 0.008	0.073  ± 0.011	0.086  ± 0.011
nad1	721	NA	NA	0.007  ± 0.005	0.051  ± 0.009	0.009  ± 0.005	0.069  ± 0.010
nad4	972	0.005  ± 0.003	0.018  ± 0.004	0.017  ± 0.005	0.051  ± 0.007	0.044  ± 0.008	0.067  ± 0.009
nad5-1, 2	796	NA	NA	0.016  ± 0.003	0.054  ± 0.008	0.031  ± 0.005	0.098  ± 0.012
nad5-4, 5	862	0.006  ± 0.004	0.009  ± 0.003	0.011  ± 0.005	0.060  ± 0.009	0.031  ± 0.008	0.120  ± 0.013
rps3	1352	0.011  ± 0.003	0.019  ± 0.004	0.040  ± 0.007	0.091  ± 0.009	0.066  ± 0.009	0.142  ± 0.011
Weighted average§		0.007  ± 0.003	0.015  ± 0.004	0.024  ± 0.005	0.060  ± 0.008	0.046  ± 0.007	0.101  ± 0.011

^*Taxa used for each gene (see Table 1 for taxon abbreviations): cox2: Z, T, Or, Be, Pe, D; nad1: T, Oe, C, Pe, A; nad4: Z, T, Or, La, Br; nad5-1, 2: T, Oe, Be, A; nad5-4, 5: Z, T, Oe, A; and rps3: Z, Or, Oe, Pe. 

^†See Table 1 for number of sites for exons except nad4 for which only exons 1 and 2 were used here for a total of 648 sites. 

^§SE were calculated according to described methods (1). 

NA, not available.