The reinforcement of Volume 18 of the Advances in Plant Physiology Series has been entirely due to commendable contributions by Scientists of Eminence in explicit fields. The enterprise of publishing the International Treatise Series on Plant Physiology has to genuinely sort out the scantiness of consequential researches, which are sincerely required for rising productivity, prosperity and sustainability of agriculture through prominently emerging technologies for reformation in metabolic boundaries necessitates mainly for abiotic stress factors. Unquestionably, our thought is to be familiar with ground-breaking science of value across the broad punitive range of the treatise. The aspiration is to make stronger the vital outcome of conscientious research in some of the very responsive areas of Plant Physiology-Plant Molecular Physiology/Biology that broadly focus upon the advancements coupled with underlying mechanisms of plant tolerance under changing environments. The Volume 18, with innovative applied research, brings jointly much needed nineteen review articles by over fifty committed contributors for this volume. The Volume 18 exclusively deals with challenges of continuing worldwide concern over the stress physiology research. Conversely, this volume also highlights trace elements; plant functional research; physiological basis of yield variation; medicinal and aromatic plants.