The present edited book is an attempt to update the state of art of the knowledge on metabolism of ROS and antioxidants and their relationship in plant adaptation to abiotic stresses involving physiological, biochemical and molecular processes. The chapters are much focused on the current climate issues and how ROS metabolism can manipulate with antioxidant system to accelerate detoxification mechanism. It will enhance the mechanistic understanding on ROS and antioxidants system and will pave the path for agricultural scientists in developing tolerant crops to achieve sustainability under the changing environmental conditions. The increase in abiotic stress factors has become a major threat to sustainability of crop production. This situation has led to think ways which can help to come out with potential measures; for which it is necessary to understand the influence of abiotic stress factors on crops performance and the mechanisms by which these factors impact plants. It has now become evident that abiotic stress impacts negatively on plant growth and development at every stage of plant's life. Plants adapt to the changing environment with the adjustment at physiological, biochemical and molecular levels. The possible mechanisms involved in the negative effects of abiotic stress factors are excess production of reactive oxygen species (ROS). They alter physiological and molecular mechanisms leading to poor performance of plants. Plants however, are able to cope with these adverse effects by inducing antioxidant systems as the priority. Nevertheless, the dual role of ROS has now been ascertained which provides an evidence for regulation of plant metabolism positively on a concentration-dependent manner. Under conditions of high ROS production, the antioxidant system plays a major role in diminishing the effects of ROS. Thus, ROS production and antioxidant system are interwoven with abiotic stress conditions. The antioxidants have the capacity to hold the stability in metabolism in order to avoid disruption due to environmental disturbances.

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Dr. M. Iqbal R. Khan is a post-doctoral fellow at International Rice Research Institute, Philippines. He completed his BSc, MSc and PhD from Department of Botany, Aligarh Muslim University. His current research interests are elucidation mechanisms involves in flooding tolerance and looking for any additional donor for breeding purpose. He has published over 35 peer-reviewed research articles, contributed 6 book chapters to various book editions published by Springer, CABI etc. He has been awarded by various research fellowships during PhD and post PhD tenure such as, UGC-MANF, DBT-RA, SERB-DST Young scientist, SERB-NPDF and IRRI-PDF. He has been awarded by Young Scientist of the Year Award 2014 from Scientific and Environmental Research Institute, India. Professor Nafees A. Khan is working as plant physiologist at Department of Botany, Aligarh Muslim University, Aligarh, India. The current research interest of Prof. Khan is mainly on understanding the mechanisms of hormonal and nutritional regulation of plant growth with special emphasis on abiotic stress vis-a-vis photosynthetic efficiency and abiotic stress tolerance. He has supervised 15 Ph.D. and 05 M.Phil. students and has edited 14 books, including this, published more than 170 peer-reviewed research articles in journals of international and national repute. He has won various prestigious awards. He is Vice President of the National Environmental Science Academy (NESA), India.