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Among abiotic stresses, soil salinity and sodality are major problems limiting plant growth and productivity. These problems are of great concern for countries whose economies rely on agriculture. Currently more than 100 countries are adversely affected by salinity and sodality and in many of these regions salinization is caused due to irrigation. . The production of crop is low in saline soil due to salt toxicity which interferes with nutrient uptake. The responses to salt stress comprise of wide range of changes at the molecular, biochemical and physiological levels. Plants withstand these stresses by modulating certain biochemical pathways. Tolerance mechanism of plants towards salinity is still a debated question. Biotechnological approaches have improved a lot in understanding the mechanisms of salt tolerance in plants. Omic approach is one of the recent tools that help us in understanding the physiology and biochemistry of the cells under salinity stress. Signalling is also an important way to understand the salinity tolerance. This volume has been compiled with the help a galaxy of researchers all over the world encompassing plant biologists and soil scientists. This book will be useful for those who are interested in stress biology of plants and would provide information about the role of omics and signalling in plants under salinity.