Tobacco plants were studied to see how they respond to being exposed to salt for a long time. The researchers looked at how the plants grew, how much proline they made, and how their sugar and enzyme levels changed. They found that salt stress caused the roots to lose more weight than the leaves, and the plants had less chlorophyll. The salt also made the plants accumulate more potassium, sodium, and chloride in their shoots. The sugar levels in the plants increased, as did the production of proline and certain enzymes. These changes help the plants deal with the stress caused by the salt.