The negative effect of non-living factors on various living organisms in a particular environment is known as abiotic stress. It can affect the growth and productivity of crops. Salt stress, drought stress, phosphate starvation in plants and serpentine soils are some of the sources of abiotic stress in plants. Chemical priming is one of the methods used to increase the tolerance of abiotic stress in crop plants. In this method, stress-inducing chemical vaccinations are given to plants to help them prepare defense mechanisms to fight when the actual abiotic stress occurs. This book provides comprehensive insights into the field of abiotic stress tolerance in plants. It discusses the fundamentals as well as modern approaches of this discipline. Through this book, we attempt to further enlighten the readers about the new concepts in this field.