From a human perspective, seeds are storage structures that supply most of the calories in form of food and feed.
Seeds represent complex biological systems in which compartments with different genotypes interact. The maternal seed integuments surround the two products of fertilization, embryo and endosperm. While the embryo represents the next generation, the endosperm is a triploid tissue that nourishes the embryo during development. Depending on the species, seeds have a persistent endosperm, or the endosperm is adsorbed during maturation, and this feature strongly affects the seed qualitative properties. Molecular data clearly show that seed compartments cannot be considered as isolated units but that the final seed structure is the result of an extremely complicated cross-talk between the various tissues. ExpoSEED aims to describe this intricate network in model and crop species to highlight common and different pathways and to put the basis for the manipulation of seed size and quality.