A major threat to agricultural productivity worldwide is undoubtedly due to environments with stressful factors including drought, salinity, waterlogging, extreme temperatures, non-optimal levels of mineral nutrients etc. Based on contributions presented at the International Conference on Biosaline Agriculture and High Salinity Tolerance in November 2006 in Gammarth, Tunisia, this book reviews the current state of knowledge in biosaline agriculture and high salinity tolerance in plants. It mainly focuses on the biotic approach to economically utilize the stress-prone areas by growing resistant.