Differential phylogenetic expansions in BAHD acyltransferases across five angiosperm taxa and evidence of divergent expression among Populus paralogues

Table 1 Summary of Gene Duplication Events Among Populus BAHD Acyltransferases

Clade	Ia	Ib	II	IIIa	IIIb	Va	Vb	Genome
Total genes in clade	18	11	5	24	2	31	9	100
Recent duplication	6 (33%)	11 (100%)	0 (0%)	14 (58%)	0 (0%)	21^a (68%)	8 (89%)	60 (60%)
Salicoid duplication	0	6	0	6	0	10	4	26
Local duplication	6^b	5^c	0	8	0	13^d	4	36
Retrotransposon association	7 (39%)	4 (36%)	1 (20%)	4 (17%)	1 (50%)	16 (52%)	2 (22%)	35 (35%)
Both 5' and 3' of gene	5	1	1	2	0	3	1	13
Either 5' or 3' of gene	2	3	0	2	1	13	1	22

^a Two members in Clade Va are associated with both salicoid and local duplications (21 = 10+13-2); ^b Includes two triplets; ^c Includes one triplet; ^d Includes one triplet and one quadruplet.

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