TABLE 1.
Evidence for Si-mediated expression of genes encoding transporters for essential and beneficial elements in plants.
| Conditions | Plant species | Localization/direction/form/function | Transporter genes | Expression pattern by Si | References |
| Low N | Rapeseed | Root/influx/nitrate/uptake | BnNRT1.1, | Up-regulated | Haddad et al., 2018 |
| BnNRT2.1 | |||||
| High N | Rice | Root/influx/ammonium/uptake | OsAMT1;1 | Down-regulated | Wu et al., 2017 |
| Root/influx/nitrate/uptake | OsNTR1.1 | ||||
| Low P | Wheat | Root/influx/phosphate/uptake | TaPHT1;1, | Up-regulated | Kostic et al., 2017 |
| TaPHT1;2 | |||||
| High P | Rice | Root/influx/phosphate/uptake | OsPHT1;6 | Down-regulated | Hu et al., 2018 |
| Low K | Sorghum | Root cortex/influx/K+/xylem unloading | SbHAK5, SbAKT1 | Down-regulated | Chen et al., 2016b |
| Root cortex/efflux/K+/xylem loading | SbSKOR1, | Up-regulated | |||
| SbSKOR2 | |||||
| Low S | Rice | Root/influx/sulfate/uptake | OsSULTR1;1 | Down-regulated (up to 3 d of S deficiency) | Réthoré et al., 2020 |
| OsSULTR1;2 | Down-regulated | ||||
| OsSULTR2;1 | Down-regulated (from 1 to 3 d of S deficiency) | ||||
| OsSULTR2;2 | Down-regulated (15 d of S deficiency) | ||||
| Low Fe | Cucumber | Root/influx/Fe2+/uptake | CsIRT1 | Up-regulated (3 d of Si supply) | Pavlovic et al., 2013 |
| Leaf/efflux/Fe(II)-complex/phloem mobilization | CsYSL1 | Up-regulated | Pavlovic et al., 2016 | ||
| Barley | Root/influx/Fe(III)-complex/uptake | HvYS1 | Up-regulated (5 h of Si supply) | Nikolic et al., 2019 | |
| High Mn | Rice | Root/influx/Mn2+/uptake | OsNramp5 | Down-regulated | Che et al., 2016 |
| High Cu | Arabidopsis | Root/influx/Cu2+/uptake | AtCOPT1, | Down-regulated | Li J. et al., 2008 |
| AtHMA5 | |||||
| Rice | Root/influx/metal ions/translocation | OsHMA2 | Down-regulated | Kim et al., 2014 | |
| Root/efflux/metal ions/sequestration | OsHMA3 | Down-regulated | |||
| Tobacco | Root/influx/Cu2+/uptake | NtCOPT1 | Down-regulated | Flora et al., 2019 | |
| High Zn | Rice | Root/influx/Zn2+/uptake | OsZIP1 | Down-regulated | Huang and Ma, 2020 |
| High B | Barley | Leaf/efflux/H3BO3/export out of symplast | HvBOR2 | Up-regulated | Akcay and Erkan, 2016 |
| High Na | Maize | Root/efflux/Na+/export and xylem loading | ZmSOS1, ZmSOS2 | Up-regulated | Bosnic et al., 2018 |
| Root/influx/Na+/uptake | ZmHKT1 | Down-regulated | |||
| Leaf/influx/Na+/vacuolar sequestration | ZmNHX | Up-regulated |