Researches have made tremendous progress in the area of Plant Physiology, greatly increasing our understanding of living processes, necessary for biotechnological research. Different volumes of the treatise ``Advances in Plant Physiology'' covers the entire spectrum of Plant Physiology including the Plant Molecular Biology in order to encourage meaningful research in the coming twenty-first century. The true endeavor in this direction is the result of comprehensive, authoritative and timely publication of this valuable treatise, provides the reader with the most recent information, views and references focused on individual topics through a rich collection of reviews contributed by pioneer workers and of those actively engaged in the studies of various specific areas in different parts of the world with extensive experience, established record of eminence and noted authorities. In fact, this treatise is a treasure for interdisciplinary exchange of information and the approach to topic ranges from theoretical to applied molecular to organismic and single to multivariable systems. Apart from fulfilling the need of this treatise for research teams and scientists actively working in the areas of plant physiology biochemistry and plant molecular biology in universities institutes and research laboratories throughout the world, it would be extremely a useful book and a voluminous reference material for acquiring advanced knowledge by students in response to innovative courses in Plant Physiology, Plant Biochemistry, Agronomy, Genetics and Plant Breeding, Genetic Engineering, Microbiology, Plant Biotechnology and Botany. Over eighteen (18) chapters of Vol. 1 extensively elucidate the needful topics of Biological Nitrogen Fixation, Plant Cell and Tissue Culture, Plant Metabolism , certain rare Techniques in Plant Physiology, Herbicides Physiology, Plant Growth Regulators, Physiology of Rooting, Tree Physiology, Stress Physiology (in part) and Growth and Development Hopefully, Vol. II will comprise other important topics.