Abstract
Allopolyploidy species oilseed rapa (AnAnCnCn; Brassica napus L.) were formed in a relatively short time (less than 10,000 years) by hybridization between Brassica rapa (Ar) and Brassica oleracea (Co). The Brassica species provide an opportunity to study the evolution of genome organization over a short timescales. It has been proved that progenitor A and C genomes are highly intact in B. napus. Based on the previous study, small-scale chromosomal changes, like homeologous exchanges (HEs), were found to be happened between two subgenomes using BAC sequencing or physical mapping methods. With the development of sequencing technology, the comparative analysis of the genome-wide level becomes feasible. Recently, the genome assemblies of two parental species Ar and Co were both completed. Therefore, in this chapter, we mainly discuss the assembly and annotation of the genome of a winter phonotype of ‘Darmor-bz’ and a semi-winter phonotype ‘ZS11’, and also investigate the subtle changes of genomic structures, including segmental and microstructure (gene order and content) changes, between the B. napus and its parental species.
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Sun, F., Chalhoub, B., Liu, S., Hua, W. (2018). Deciphering Genome Organization of the Polyploid Brassica napus. In: Liu, S., Snowdon, R., Chalhoub, B. (eds) The Brassica napus Genome. Compendium of Plant Genomes. Springer, Cham. https://doi.org/10.1007/978-3-319-43694-4_4
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