TABLE 2.

Evidence for expression of Si transporter genes affected by supply of essential and beneficial elements.

Conditions	Plant species	Localization/direction/form/function	Si transporter genes	Expression pattern affected by element supply	References
Low N	Rice	Root/influx/H4SiO4/uptake	OsLsi1	Up-regulated	Wu et al., 2017
		Root/efflux/H4SiO3–/xylem loading	OsLsi2	Up-regulated
High N	Rice	Root/influx/H4SiO4/uptake	OsLsi1	Down-regulated	Wu et al., 2017
		Root/efflux//H4SiO3–/xylem loading	OsLsi2	Down-regulated
Low K	Barley	Root/influx/H4SiO4/uptake	HvLsi1	Up-regulated	Hosseini et al., 2017
		Root/efflux//H4SiO3–/xylem loading	HvLsi2	Up-regulated
		Leaf/influx/H4SiO4/xylem unloading	HvLsi6	Up-regulated
Low Fe	Rice	Root/influx/H4SiO4/uptake	OsLsi1	Up-regulated	Chaiwong et al., 2020
High Cu	Rice	Root/influx/H4SiO4/uptake	OsLsi1	Up-regulated	Kim et al., 2014
		Root/efflux//H4SiO3–/xylem loading	OsLsi2	Up-regulated
High Zn	Maize	Root/influx/H4SiO4/uptake	ZmLsi1	Down-regulated	Bokor et al., 2015
		Root/efflux//H4SiO3–/xylem loading	ZmLsi2	Down-regulated
		Leaf/influx/H4SiO4/xylem unloading	ZmLsi6	Up-regulated
High Al	Rice	Root/influx/H4SiO4/uptake	OsLsi1	Up-regulated	Xiao et al., 2021
		Root/efflux//H4SiO3–/xylem loading	OsLsi2	Up-regulated
	Ryegrass	Root/influx/H4SiO4/uptake	LpLsi1	Up-regulated	Pontigo et al., 2017
		Root/efflux//H4SiO3–/xylem loading	LpLsi2	Up-regulated