Genome structure of the parental species is a crucial factor directly influencing crossing success. This project will apply state-of-the-art technologies such as optical mapping (BioNano Genomics) and synthetic reads (10x Chromium, PacBio, Sequel) aiming to disclose crossover frequency within haplotypes, genome structure and structural variation in parental lines and offspring of crops such as tomato, potato, melon, and lettuce and offspring generations. This knowledge is essential for the selection of compatible breeding parents. Sequence features influencing recombination in these various crops will be obtained using state-of-the-art machine learning approaches. The link between structural diversity, genetic diversity and haplotype meiotic crossover frequency with functional characteristics (QTL) for particular agronomic important traits will be assessed. Plant breeding would have to increase crop yield and crop resilience to biotic and abiotic stresses during the next decades to ensure Food Security. Crop improvement by plant breeders in Europe is exceedingly reliant on harnessing the natural genetic variation and recombination that arises during the meiotic process. The formation of genetic crossovers create new combinations of alleles that could confer new phenotypes/traits on the next generations. This genetic variation can be exploited by plant breeders to produce new crop varieties. Nevertheless, in most plant species, remarkably important crops, recombination is limited to some regions of the chromosomes. For instance, in cereals has been estimated that 30-50% of their genes very rarely recombine. This is a serious problem for plant breeders as they are unable to access all the potential genetic variation within the species. MEICOM is designed to achieve an understanding of the factors that influence the transitions from DSB formation to CO product in crops and evaluate the most effective approaches to manipulating this outcome by capitalizing on our expert knowledge of meiotic recombination in plants combined with cutting-edge methodological developments. To achieve this important and ambitious goal we have assembled a network of leading European plant meiosis research groups that possess a wide range of complementary research skills plus an excellent track record of synergistic interactions through collaborative research and training networks such as MEIOSYS, RECBREED and COMREC. The training of ESRs involves the commitment of stakeholder breeding companies who are providing first-hand insight into the major challenges that confront the industry over the next decade, thus ensuring a strong intersectorial component that can be consolidated and further developed.