Identification of K+/H+ antiporter homolog in barley: Expression in cultivars with different tolerance to NaCl

Atmospheric CO2 concentration influences the contributions of osmolyte accumulation and cell wall elasticity to salt tolerance in barley cultivars

“…2) and were similar to the concentrations observed in other studies on H. vulgare (Garthwaite et al, 2005). Since concentrations higher than 11.5 mg g À1 DW in the cytosol cannot be tolerated by most enzymes (Munns et al, 2006), it is possible that these potentially toxic ions were accumulated in the apoplast, accelerating tissue DH, and/or compartmentalized in vacuoles through the activation of V-ATPases and Na + /H + transporters, as observed by Ershov et al (2007) in barley. Thus, increases in Na + and Cl À would contribute to OA, thereby protecting the cytosol from ion toxicity.…”

“…However, current knowledge about interaction between rising CO 2 and salinity remains insufficient (Melgar et al, 2008). It has been reported that barley can accumulate Na + in vacuoles (Ershov et al, 2007), differentially distribute ions between epidermal and mesophyll cells (Fricke et al, 1996), and accumulate glycine-betaine and polyols (Chen et al, 2007), thereby enabling it to grow under soil salt concentrations of 8-16 dS m À1 . However, there are cultivarspecific differences in these processes (Royo and Aragües, 1999).…”