Effects of Ca2+, K+ and cGMP on Na+ uptake in pepper plants

By F. Rubio, P. Flores, J. Navarro, V. Martínez. 2003

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Genotypic variation in the response of pepper to salinity (2006, background): “By reducing Na uptake and promoting K uptake, Ca greatly contributes to maintenance of higher K/Na ratios in plant as shown in pepper plants (Rubio et al., 2003).”
Salinity stress alleviation using arbuscular mycorrhizal fungi. A review (2011, unknown): “Interestingly, improved salt tolerance correlated with cNMP-dependent decrease of channel open probability and reduced influx of Na + (Maathuis and Sanders 2001; Rubio et al. 2003).”
Mechanisms of sodium uptake by roots of higher plants (2009, background): “…Ca2+ concentrations, could lead to a breakdown in the K+/Na+ selectivity, enabling Na+ influx and inducing the leakage of cytosolic K+ from the cell (Cramer et al. 1985; Horie et al. 2006; Kloareg et al. 1987; Rubio et al. 2003; Stassart et al. 1981; Tuna et al. 2007; Zhong and Läuchli 1993a, b).”
Plant Salinity Stress: Many Unanswered Questions Remain (2019, background): “Furthermore, cGMP inhibits Na+ influx in several plant species (Maathuis and Sanders, 2001; Essah et al., 2003; Rubio et al., 2003) while it can regulate transcription of various genes related to salinity stress and promote K+ uptake (Maathuis, 2006, 2014; Isner and Maathuis, 2016).”