The researchers studied how adding extra proline to melon plants helps them cope with salt stress. They measured proline levels and enzyme activities in the leaves of melon seedlings under different conditions. They found that proline levels increased significantly under salt stress, and adding extra proline boosted this even more. The enzymes involved in proline metabolism were affected differently by salt stress and extra proline. Overall, the study showed that adding proline can help melon plants tolerate salt stress by changing how proline is made and broken down in the plant.