FIGURE 1.

Contrasting responses of plant Na⁺ fluxes to Si. In pre-labeled roots of intact rice seedlings, ²⁴Na⁺ efflux shows no difference in plants grown with or without Si in the presence of high salinity (main panel; redrawn from Malagoli et al., 2008). By contrast, Na⁺ fluxes from root to shoot are highly sensitive to Si supply (inset; redrawn from Gong et al., 2006).