Homoeologous shuffling and chromosome compensation maintain genome balance in resynthesized allopolyploid Brassica napus.

ABSTRACT: Polyploidy has contributed to the evolution of eukaryotes, particularly flowering plants. The genomic consequences of polyploidy have been extensively studied, but the mechanisms for chromosome stability and diploidization in polyploids remain largely unknown. By using new cytogenetic tools to identify all of the homoeologous chromosomes, we conducted a cytological investigation of 50 resynthesized Brassica napus allopolyploids across generations S(0:1) to S(5:6) and in the S(10:11) generation. Changes in copy number of individual chromosomes were detected in the S(0:1) generation and increased in subsequent generations, despite the fact that the mean chromosome number among lines was approximately 38. The chromosome complement of individual plants (segregants) ranged from 36 to 42, with a

SUBMITTER: Xiong Z 

PROVIDER: S-EPMC3093481 | biostudies-literature | 2011 May

REPOSITORIES: biostudies-literature