I recently wrote a paper on salt-tolerant plants (halophytes). Mangroves can grow in 0%-150% seawater (red mangroves at least), but they grow MUCH slower in fresh water. Why this happens isn't completely understood, but it's the case with most halophytes.
Some scientists believe that the osmotic gradient produced between the vacuoles and the cytoplasm (in the leaf cells) is used in the plant's metabolic processes.
Some scientists believe that the osmotic gradient produced between the vacuoles and the cytoplasm (in the leaf cells) is used in the plant's metabolic processes.
