Halophytes, salt-tolerant plants that grow in soils and waters with high salinity , are spectacular plants that can prove tremendously valuable to both man as well as nature due to their unique physiology , such as to enhance the productivity of crops in salt-affected soils, for land re-vegetation, to develop salt-tolerant crops, and to provide forage for cattle. This new book presents scientific knowledge and expertise on the mechanisms of plant responses to various environmental stresses, providing a systematic review of the physiological responses of halophytes to salinity , discussing adaptive pathways of halophytes and the prospects of increasing plant salinity tolerance.