Selaginella moellendorffiihas a reduced and highly conserved expansin superfamily with genes more closely related to angiosperms than to bryophytes

Table 1 Expansin and other selected plant gene family compositions

	*Arabidopsis thaliana*	*Oryza sativa*	*Populus trichocarpa*	*Selaginella moellendorffii*	*Physcomitrella patens*
EXPA	26	33	27	15	28
EXPB	6	18	3	2	7
EXLA	3	4	2	0	0
EXLB	1	1	4	0	0
MIP	35	33	55	19	23
XTH	33	30	41	19	31
Callose synthase	12	10	19	7	12
sequence available	complete genome	complete genome	473.1 Mbp^†	212.5 Mbp	480 Mbp^Δ
			22, 136 scaffolds	759 scaffolds	2,106 scaffolds
			7.5X coverage	7.0X coverage	8.1X coverage

Numbers and type of genes found in a sampling of plant species with completed or nearly completed genome sequences [17, 18, 25–28].
^† at time of search (Sampedro, Carey, & Cosgrove, 2006).
^Δ at time of search (Carey & Cosgrove, 2007).

ISSN: 1471-2229