Differentiation of Closely Related Genomes and Chromosome Identification in Brassica napus L. by Simultaneous Fluorescence in situ Hybridization and Genomic in situ Hybridization

摘要

Comparative analysis of genome structure of modern polyploids and their ancestors is important for our understanding of the process of speciation as polyp-loidy and interspecific hybridization are considered to be the factors underlying plant evolution. Rapeseed (Brassica napus L. AACC, 2n = 38) is a valuable crop and a natural allopolyploid species. The genome of natural B. napus formed by spontaneous hybridization of Brassica oleracea L. (CC, 2n = 18) and Brassica rapa L. (AA, 2n = 20) followed by dip-loidization. A and C subgenomes of B. napus are closely related.