Plant are highly adaptable, and can handle small changes in salinity. Large changes, either way, higher or lower, could drastically affect the growth rate or even the survivability of the plant. Salt in the water, affects the plant more than salt in the air, so don't pour salt water on your house plants. A good case study, if you live by a coast, is to check the local water plant life in river tributaries. These plants survive in a tidal mix that can go from fresh water to sea water. I could go on and on, but you get the idea, salt in the air ok, salt in the water might be bad.