Table 2.

Transcriptional Regulators Implicated in ABA Signaling

Binding Site/Factor Class	Genus	Factor	References
ABA response elements (ABREs)/bZIPs	Arabidopsis	ABI5/AtDPBF1 AtDPBF2 AtDPBF3/AREB3 AtDPBF4 AtDPBF5/ABF3 ABF1 ABF2/AREB1 ABF4/AREB2	Choi et al., 2000; Finkelstein and Lynch, 2000a; Lopez-Molina and Chua, 2000; Uno et al., 2000
		GBF3	Lu et al., 1996
	Helianthus	DPBF1, -2 and -3	Kim et al., 1997; Kim and Thomas, 1998
	Oryza	TRAB1	Hobo et al., 1999
	Phaseolus	PvZIP6	AF369792a
		ROM2 (repressor)	Chern et al., 1996
	Triticum	EmBP-1	Guiltinan et al., 1990
RY/Sph elements/B3 domain proteins	Arabidopsis	ABI3	Giraudat et al., 1992
	Avena	AfVP1	Jones et al., 1997
	Craterostigma	CpVP1	Chandler and Bartels, 1997
	Daucus	C-ABI3	Shiota et al., 1998
	Phaseolus	PvALF	Bobb et al., 1995
	Populus	PtABI3	Rohde et al., 1998
	Oryza	OsVP1	Hattori et al., 1994
	Triticum	TaVP1	Bailey et al., 1999
	Zea mays	VP1	McCarty et al., 1991
MYB	Arabidopsis	AtMYB2	Abe et al., 1997
MYC	Arabidopsis	AtMYC	Abe et al., 1997
Unknown/HD-Zip	Arabidopsis	ATHB6 ATHB7 ATHB12	Söderman et al., 1996; Lee and Chun, 1998; Söderman et al., 1999
Unknown/AP2	Arabidopsis	ABI4	Finkelstein et al., 1998; Söderman et al., 2000

^aMember of the ABI5 homologous subfamily, but no direct evidence for a role in ABA signaling; isolated from ethylene-treated leaf abscission zones of bean.