The book deals with dual role of reactive oxygen species (ROS) which is beneficial and harmful at below and above threshold limits, respectively. To date, the emphasis has been laid only on ROS aspects damaging/ disrupting cellular machinery and inflicting crop productivity loss. The ROS is believed to be a hallmark of both abiotic and biotic stress. However, the recent researches have unambiguously established that the ROS at below threshold confers protection against both abiotic and biotic stress, augmenting crop productivity.  This emphasizes for a proper understanding of ROS based physio-molecular mechanisms and their upgradation in crops to adapt them to stress conditions. As a result, the cultivation area of various economically important crops and their productivity and quality can be enhanced, arresting degradation of sites, improving environment quality and mitigating ill impact of climate change. The book encompasses recent information on positive and negative impact of ROS on stress tolerance mechanisms and their management in augmenting crop performance. The information has been well illustrated and categorized in several chapters crafted lucidly, maintaining connectivity and synergy with each other. The book provides up-to-date comprehensive scientific information dual role of ROS, hitherto neglected, in crop abiotic and biotic stress management that would immensely benefit and educate graduate/ post graduate students, entrepreneurs, researchers, scientists and faculty members alike. 

The book inculcates a holistic approach to improve crop productivity and quality for ensuring food security and nutrition to all. This warrants to identify various stress conditions prevalent globally and tailor crop adaptability and productivity to the maximum accordingly, employing physio-molecular modern tools and techniques with judicious amalgamation with conventional crop husbandry. As a result, the book chapters encompass diverse environmental factors, internal physio-molecular processes and their modulations with a final goal of expanding area under cultivation by utilization of constraint terrains of poor site quality and augmenting sustainable crop productivity and quality on the face of rapidly changing climate. The book includes role of plant hormones, nano-sensors, nanomaterials etc. in stress tolerance responses, capturing recent advancement in the field of stress tolerance, enlarging scope of coverage by gleaning modern literature and providing glimpses of futuristic scenario of agriculture practices that can render 'balance staple food rich in nutrition, vitamins and minerals' to teeming billions of global human populations. Thus, the book provides a comprehensive overview of the role of stress environment and understanding stress physiology for developing stress tolerant crops. The book covers current knowledge and future prospects to achieve enhanced food security under stress environment of crops. The renowned contributors elegantly crafted each chapter, suited alike to both classroom texts for graduate students and reference material for researchers. The language and style are simple and lucid with liberal use of illustrations. This book should be on the shelf of university/ personal libraries for inquisitive students and enlightened researchers.