Table 1.

Numbers of expansin genes in different plants.

Species	EXPA	EXPB	EXLA	EXLB	Total	References
Algae
Micrasterias denticulata					4′EXP’	[22]
Moss
Physcomitrella patens	28	7	0	0	34	[23]
Fern
Selaginella moellendorffi	15	2	0	0	17	[34]
Gymnosperm
Pinus taeda	6	1	1	1	9	[5]
Angiosperms
Monocotyledon
Rice	33	18	4	1	56	[5]
Maize	36	48	4	0	88	[24]
Triticum aestivum	52	42	4	0	98	[35]
Dicotyledon
Cruciferae
Arabidopsis thaliana	26	6	3	1	36	[5]
Brassica rapa	41	10	2	3	56
Brassica oleracea	41	12	2	3	58
Brassica nigra	47	9	2	2	60
Solanaceae
Tobacco	36	6	3	7	52	[26]
Tomato	25	8	1	4	38	[36]
Potato	24	5	1	6	36	[18]
Leguminosae
Soybean	49	9	2	15	75	[25]
Salicaceae
Poplar	27	3	2	4	36	[37]
Amborellaceae
Amborella trichopoda	17	2	1	2	22	[38]
Vitaceae
Grape	20	4	1	4	29	[39]
Rosaceae
Apple	34	1	2	4	41	[27]