Dear All
I am running an salt stress experiment at germination stage using seawater in barley. When we measured Na and K we found that the Na and K had higher concentration n the tolerant plants compared to susceptible plants (weak germination).
did any one face such issue before?
Dear Gregor Steve,
Many salinity stress-responsive genes control the salt tolerance trait through complex genetic regulatory networks. Salinity affects the growth and yield of plants by challenging plants with both osmotic and ionic stress. Salt Overly Sensitive (SOS) signaling pathway that consists of SOS3, SOS2, and SOS1 has mediated cellular signaling cascades under salt stress. Thus, maintain cellular ion homeostasis by restricting the accumulation of toxic sodium (Na+) concentrations. Overexpression of SOS pathway-related genes showed lower toxic Na+ and greater K+ accumulation, resulting in enhanced salinity stress tolerance in transgenic Arabidopsis thaliana plants.
I agree with Kouadri Mohamed El Amine Mohd Akram Ansari that Na+ and K+ ions are accumulated in tolerant plants as part of tolerance mechanisms. I would suggest checking the concentrations of potassium, magnesium, SO4 and NO3 as well to truly determine the tolerance of plants. A decline in other ionic concentrations would give you a brief insight on how the plant is regulating its ions under saline stress.
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