This book collates a wide spectrum of topics relevant to contemporary research achievement in sustainable utilization of plant genetic resources and conservation of plant genetic diversity within the framework of different crop systems. It introduces the status of crop genetic diversity and provides prospects for conservation of crop genetic diversity for sustainable agriculture. Plant genetic diversity is crucial for food security and agro-ecosystem maintenance paving ways to achieve sustainable agriculture development. This necessitates, consciously and judiciously, the conservation of all existing plant genetic resources for sustainable use in a variety of applications for human welfare. The wild and traditional landraces have generated an increased interest as a repertoire of valuable traits for breeding and improvement of cultivated germplasm. Internationally, concerted actions and policies toward for the conservation and management of plant genetic diversity are mounting, fromthe organization levels to national policies as deemed appropriate for the sustainable development goals. This needs an understanding of genetic diversity of different crops, ecological drivers and the structural changes within genetic diversity due to climate change. It is also equally important to evolve knowledge on what, how and where to conserve the existing plant genetic resources for present and future use. Assessment of the genetic diversity presents in a wild and traditional agro-ecosystem is another step towards effective utilization.  In the past few years, advanced breeding tools have been developed which have offered great promise for efficient modification of targeted traits. This book consolidates current knowledge in the above core areas of plant genetic diversity and conservation. It is an essential reference for professionals, researchers, policy makers and commercial entrepreneurs concerned with plant genetic diversity and breeding to achieve enhanced agricultural productivity and sustainability of food resources to ensure food security. The book is also invaluable for graduate students involved in agriculture research.