This depend on plant species,age,ions types,environmental conditions,irrigation water quality ,soil texture .
It can vary alot depending on the plant type's evolution/adaptation. Also, in any study, to be valid in my opinion, the experiment also must be tested on soil. We do use various growth media to visualize roots without soil but often water and mineral, salts relations are not as Normal on medium, compared to soils. We have tested any where from 0 mM to 400 mM different salts (sterile solutions) for abiotic studies for a variety of plant types.
I agree with the previous answers of the colleagues. Plants are classified as halophytes and glycophytes. The first can tolerate very high salinity, but the latter is very sensitive to salinity. Still, some other plants (facultative or habitat-indifferent) can grow very well at both saline and non-saline habitats.
Beside the aforementioned answers it would be more reliable if you use either saline soil from the field or saline water, so you can get reliable results as the lab prepared saline environment would not be the same.
Dear Sethuraj,
I agree with above included answers. It largely depends on your study objectives, selected species for investigation and their supposed or hypothetical salt tolerance. I strongly recommend you to follow a literature survey depending on your research. This could help you to choose the type of salt stress, the concentrations of used treatments, duration of salt exposure etc.
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