Tissue-specific expression analysis of Na+ and Cl− transporter genes associated with salt removal ability in rice leaf sheath

Table 1 All candidate genes and the physiological functions used in this study

Ion	Transporter gene	Candidate gene	Function	Reference
Na⁺	HKT High-affinity K⁺ transport (Plasma membrane)	OsHKT1;1 OsHKT1;3 OsHKT1;4 OsHKT1;5 OsHKT2;1 OsHKT2;3 OsHKT2;4	Control root-to-shoot transfer of Na⁺ by unloading of Na⁺ from the xylem into xylem parenchyma cells, and reduce Na⁺ and increasing K⁺ levels in shoots during salt stress	[2, 7, 10,11,12,13, 18, 19]
	NHX Na⁺/H⁺ Exchanger (Tonoplast)	OsNHX1 OsNHX2 OsNHX3 OsNHX4 OsNHX5	Maintain low Na⁺ in the cytosol under salt stress by vacuolar Na⁺ sequestration	[24]
	SOS Salt Overly Sensitive (Plasma membrane)	OsSOS1	Mediate Na⁺ loading into the xylem	[27, 34]
Cl⁻	NPF Nitrate Transporter 1/Peptide Trasnport Family (Plasma membrane)	OsNPF2;4	Mediate Cl⁻ loading to the root xylem	[35]
	CLC Chloride Channel (Tonoplast)	OsCLC1 OsCLC2 OsCLC5 OsCLC6	Function in compartmentalizing Cl⁻ ions into the vacuole in rice	[39]
	CCC Cation-Chloride Cotransporter (Plasma membrane)	OsCCC1	Mediate Cl⁻ loading and unloading between xylem parenchyma cells and xylem vessels	[38]
	SLAH Slow-Type Anion Channel-Associated Homolog (Plasma membrane)	OsSLAH1 OsSLAH7	Mediate Cl⁻ loading to the root xylem	[36]

ISSN: 1471-2229