WRKY Proteins: Signaling and Regulation of Expression during Abiotic Stress Responses

Table 1

Major families of WRKY proteins with associated characteristics.

Gene family name	Gene family subclass	Protein associated	Protein type	References
Group I	—	AtWRKY1, AtWRKY2, AtWRKY1, AtWRKY2, AtWRKY3, AtWRKY4, AtWRKY10, AtWRKY19, AtWRKY20, AtWRKY25, AtWRKY26, AtWRKY32, AtWRKY33, AtWRKY34, AtWRKY44, AtWRKY45, AtWRKY58, AtWRKY73, OsWRKY24, OSWRKY70, OsWRKY78, OsWRKY30, OsWRKY4, OsWRKY63, OsWRKY61, OsWRKY81	The proteins contain two WRKY domains
Group II (Arabidopsis)	IIa	AtWRKY18, AtWRKY40, AtWRKY60	Single WRKY domain with the same Cys2-His2 Zn finger motif
	IIb	AtWRKY6, AtWRKY9, AtWRKY31, AtWRKY36, AtWRKY42, AtWRKY47, AtWRKY61, AtWRKY72
	IIc	AtWRKY8, AtWRKY12, AtWRKY13, AtWRKY23, AtWRKY24, AtWRKY28, AtWRKY43, AtWRKY48, AtWRKY49, AtWRKY50, AtWRKY51, AtWRKY56, AtWRKY57, AtWRKY59, AtWRKY68, AtWRKY71, AtWRKY75
	IId	AtWRKY7, AtWRKY11, AtWRKY15, AtWRKY17, AtWRKY21, AtWRKY39, AtWRKY74		[13, 14, 20–22, 117, 118]
	IIe	AtWRKY14, AtWRKY16, AtWRKY22, AtWRKY27, AtWRKY29, AtWRKY35, AtWRKY65, AtWRKY69
	IIIa	AtWRKY38, AtWRKY62, AtWRKY63, AtWRKY64, AtWRKY66, AtWRKY67
Group II (rice)	—	OsWRKY51, OsWRKY42, OsWRKY25, OsWRKY44, OsWRKY68, OsWRKY6, OsWRKY37, OsWRKY66, OsWRKY2, OsWRKY13
Group III (Arabidopsis)	IIIb	AtWRKY30, AtWRKY41, AtWRKY46, AtWRKY53, AtWRKY54, AtWRKY55, AtWRKY70	Single WRKY domain with different Cys2-His/Cys Cys2-His2 Zn finger motif
Group III (rice)	—	OsWRKY22, OsWRKY20, OsWRKY69, OsWRKY74, OsWRKY15, OsWRKY19, OsWRKY45, OsWRKY75
Group IV	IVa	OsWRKY33, OsWRKY38	Presence of partial Zn finger motif
	IVb	VvWRKY02, VvWRKY29, OsWRKY56, OsWRKY58, OsWRKY52	Loss of Zn finger motif

“At” refers to Arabidopsis thaliana, “Os” to Oryza sativa, and “Vv” to Vitis vinifera.