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Figure 3 | Rice

Figure 3

From: Insights into genomics of salt stress response in rice

Figure 3

Schematic diagram of a plant cell showing regulation of ion homeostasis by various ion transporters. The salinity stress signal is perceived by receptor(s) or salt sensor(s) probably present at the plasma membrane of the cell. The signal is responsible for activating the SOS pathway, the component of which helps in regulating some of these transporters. The transporters are K+ inward-rectifying channel (OsAKT1), K+/Na+ symporter (OsHKT1), nonselective cation channel (NCC), K+ outward-rectifying channel (OsKCO1), Na+/H+ antiporters (OsSOS1), vacuolar Na+/H+ exchangers (OsNHX1-4), endosomal Na+/H+ exchanger (OsNHX5), H+/Ca+ antiporter (OsCAX1) and vacuolar chloride channel (OsCLC1). Na+ extrusion from plant cells is powered by the electrochemical gradient generated by H+-ATPases, which permits the Na+/H+ antiporters to couple the passive movement of H+ inside along the electrochemical gradient and extrusion of Na+ out of cytosol. ER, endoplasmic reticulum; TGN/EE, trans-Golgi network/early endosome; LE/PVC/MVB, late endosome/pre-vacuolar compartment/multivesicular body; RE, recycling endosome. The stress signal sensed by SOS3 activates SOS2, which activates SOS1, details is given in the text.

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