. 2012 Jun 3;2012:927436. doi: 10.5402/2012/927436

Table 1.

Plant ion transporters involved in salt tolerance identified by functional analysis.

Name	Source species	Gene product	Function	Identification method	Harbourg species	Reference
			Sodium influx

AtHKT1	A. thaliana	Na⁺ transporter	Na⁺/K⁺ homeostasis	Mutation	Arabidopsis	[13]
HKT1	T. aestivum	Na⁺/K⁺ transporter	K⁺/Na⁺ homeostasis	Overexpression	Wheat	[31]

			Sodium efflux

AtSOS1	A. thaliana	Plasma membrane Na⁺/H⁺ antiporter	Na⁺ detoxification	Mutation	Arabidopsis overexpression	[76]
TaSOS1	T. aestivum	Plasma membrane Na⁺/H⁺ antiporter	Na⁺ detoxification	Mutation	Arabidopsis overexpression	[99]

			Sodium compartmentation

AtNHX1	A. thaliana	Vacuolar Na⁺/H⁺ antiporter	Na⁺ vacuolar sequestration	Overexpression	Arabidopsis,	[11]
AtNHX1	A. thaliana	Vacuolar Na⁺/H⁺ antiporter	Na⁺ vacuolar sequestration	Overexpression	Cabbage, tomato	[93]
TNHX1	T. aestivum	Vacuolar Na⁺/H⁺ antiporter	Na⁺ vacuolar sequestration	Overexpression	Arabidopsis	[96, 114]
AVP1	A. thaliana	Vacuolar H⁺-PPase	H⁺ transport, vacuolar acidification	Overexpression	Arabidopsis	[15]
TVP1	T. aestivum	Vacuolar H⁺-PPase	H⁺ transport, vacuolar acidification	Overexpression	Arabidopsis	[96, 114]

			Regulatory genes

SOS2	A. thaliana	Serine/threonine Protein kinase	SOS1 regulator	Mutation	Arabidopsis	[87]
SOS3	A. thaliana	Ca⁺⁺ binding protein	Ca⁺⁺ sensor/SOS2 activator	Mutation	Arabidopsis	[81]