Plants experience stress due to environmental changes, either in biotic or abiotic form, during their life cycle. Non-heritable modifications in morphological, physiological or biochemical characteristics tend to reduce or decrease growth and productivity, and sometimes lead to death. This book presents an exhaustive overview of the specific effects and modifications that could occur in this regard, and will serve to consolidate the ideas to promote standardization of plant adaptation to these changes in the environment. This book returns to the facts of both biotic and abiotic stress, detailing an essential aspect of plant life in the context of stress response. The text is a comprehensive, current reference that effectively addresses issues and concerns related to plant stress in natural environments. Although many reference books about abiotic stress and other environmental stresses have been published, they all exist in relative isolation from one another, covering only one specific topic. This book is, rather, a comprehensive review of all aspects of the responses of plants to changes in the environment.