Table 1.

Number of E3 ubiquitin ligase genes, by subfamily, in peach and seven other plant species

	RING	F-box	BTB	U-box	SKP	Cullin	HECT	DDBa	RBXa	Total
Peach	338	267	67	54	16	13	7	3	NI	765
Arabidopsisb	465	654	79	62	21	10	7	5	2	1354
Grapeb	330	153	63	56	10	8	9	NI	NI	677
Riceb	378	702	126	76	27	10	8	3	2	1387
Soybeanb	725	418	77	120	18	24	19	3	2	1519
Poplarb	399	335	81	93	15	13	7	5	3	1027
Medicagob	294	539	41	38	36	12	9	NI	NI	1011
Maizeb	401	325	129	119	31	6	21	NI	NI	1100

^aBlast searches for RBX or DDB families have not found any qualified hits in some species (NI, none identified)

^bThe data were collected from the plantsUPS database (http://bioinformatics.cau.edu.cn) [2]