Table 1.

Some important genes or transporters for improved drought tolerance through modulating ABA signaling pathway in plants.

Plant Species	Gene/Transporter	Function	References
Agrostis grass	VuNCED1	Increased 3–4-fold plant biomass	[124]
Arabidopsis thaliana	AtABCG17-18	Stomatal conductance, and increased water use efficiency	[125]
	AtPDR12/ABCG40	ABA uptake transporter	[32]
	AIT1/NRT1.2	ABA importer important for stomatal aperture	[126]
	AtBBD1	Increased expression of ABA and drought-responsive genes	[127]
	AtSAUR32	Highly induced by abscisic acid and drought treatment	[128]
	AtbHLH68	Lateral root elongation in response to drought	[129]
	AtHDA9 and ABI4	Regulate CYP707A1 and CYP707A2 expression under drought	[130]
	AtDTX/MATE	Facilitate ABA efflux and tolerance to drought	[15]
Brachypodium distachyon	BdABCG25	Regulate intercellular ABA transport	[131]
Brassica napus	BnFTA	Improved under drought conditions	[132]
Glycine max	GmCIPK2	ABA signaling and drought tolerance	[133]
Nicotiana tabacum	SgNCED1	Enhanced ABA accumulation increased drought tolerance	[134]
Oryza sativa	Oshox22	Increased ABA content, and enhanced drought tolerance	[135]
	OsbZIP46CA1	Improved drought resistance	[136]
	OsPM1	ABA influx carrier is important in drought responses	[137]
Petunia	LeNCED1	Elevated levels of ABA and proline, increases drought resistance	[138]
Setaria italica	SiARDP target of SiAREB	ABA-dependent signal pathways	[139]
Solanum lycopersicum	SlGRAS42s	ABA signaling	[140]
	PYR/PYL/RCAR	Role in seed germination and basal ABA signaling	[141]
Triticum aestivum	HVA1	Improved growth characteristics under water deficit	[142]
Vigna unguiculata	VuABCG25	Involved in ABA signaling pathway under water stress	[143]
Vitis vinifera	VviNCED1, VviNCED2	ABA synthesis in response to plant water status	[144,145,146]
Xanthoceras sorbifolium	XsWRKY20	Regulate drought tolerance by ABA signaling pathway	[147]
Zea mays	ZmXerico1-2	Improved water use efficiency, yield under drought stress	[148]