This new volume offers a valuable introduction to plant ecology from a genomics point of view, presenting a thorough foundation and summary of modern approaches, methodologies, research goals, and evidence of plant ecology in the modern genomic era. The book also presents important updated information on the most recent knowledge of the different aspects of plant populations. The volume gives an overview of the approaches to unravelling the genetic basis underlying fundamental responses of plants to their natural environments, describing in detail the concepts, aims, and approaches of plant ecological genomics along with the genomic tools embraced by ecologists for mining various ecological problems. Recent advances and breakthroughs made in molecular markers along with their applications in plant ecogenomic studies are shared, and specific applications, techniques, and tools are described as well, such advanced molecular techniques, next-generation sequencing, eDNA metabarcoding, among others.