The openings offered by functional genomics reconciles organism biology and molecular biology, in order to define an integrative biology that should allow new insights about how a phenotype is built up from a genotype in interaction with its environment. This book covers a wide area of concepts and methods in genomics. This range from international genome sequencing projects to invaluable bioinformatics tools, analytical methods of gene expression, including final metabolic products, and their specific tissue to cellular compartmentalization. This new knowledge enables readers to understand the integration of basic physiological functions, and developmental programs. Also, the establishment of tight relationships between genomics, and genetics and plant breeding reveals synergies for exploiting molecular markers, for analysing genetic variation, or for studying quantitative traits. The integration that is now feasible by these new approaches also effects ecophysiology, and opens up new perspectives for the us