Allelic variation within the S-adenosyl-L-homocysteine hydrolase gene family is associated with wood properties in Chinese white poplar (Populus tomentosa)

Table 2 Summary of nucleotide polymorphisms within PtoSAHHA and PtoSAHHB

Locus	Region	Length (bp)	No. of polymorphic sites	Frequency (bp^-1)	Nucleotide diversity
					π_T	θ_w
PtoSAHHA	5'-UTR	229	18	13	0.01766	0.01798
	Exon 1	711	45	16	0.00710	0.01447
	Synonymous	163.01	17	10	0.02308	0.02385
	Nonsynonymous	547.99	28	20	0.00235	0.01169
	Intron 1	510	43	12	0.01401	0.02033
	Exon 2	747	44	17	0.00758	0.01378
	Synonymous	172.01	19	9	0.02524	0.02503
	Nonsynonymous	571.99	25	23	0.00231	0.01056
	3'-UTR	248	16	16	0.01640	0.01493
	Total silent^a	1307.03	113	12	0.01767	0.02001
	Synonymous	335.03	36	9	0.02418	0.02498
	Nonsynonymous	1,119.97	53	21	0.00233	0.01104
	Total^b	2,445	166	15	0.01059	0.01574
PtoSAHHB	5'-UTR	129	9	14	0.01094	0.01612
	Exon 1	711	44	16	0.00919	0.01430
	Synonymous	163.29	17	10	0.02590	0.02406
	Nonsynonymous	547.71	27	20	0.00421	0.01139
	Intron 1	673	59	11	0.01772	0.02051
	Exon 2	747	35	21	0.00248	0.01083
	Synonymous	174.08	9	19	0.00291	0.01195
	Nonsynonymous	569.92	26	22	0.00236	0.01054
	3'-UTR	181	13	14	0.00568	0.01707
	Total silent^a	1310.38	107	12	0.01444	0.01887
	Synonymous	337.38	26	13	0.01404	0.01781
	Nonsynonymous	1,117.62	53	21	0.00326	0.01096
	Total^b	2,441	160	15	0.00930	0.01523

Regions containing indels were excluded from the calculation; the standard deviations (SD) of π_T was not shown in this table; ^aTotal silent = synonymous plus noncoding sites; ^bTotal = silent sites plus nonsynonymous sites.

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