Observation on chromosome behavior during meiosis of resynthesized Brassica napus

摘要

Four characters of the chromosome behavior during meiosis were observed in the new resynthesized Brassica napus F0 plants: 1 ) One group of chromatin separated into two during interphase; 2) Separation and asynchronous division of two groups of chromosomes, suggesting that the two groups of chromosomes are respectively from A and C genomes, which maintained independent in the PMCs; 3) Chromosome pairing within genomes occurred more frequently than that between A- and C-genome;4) Meiosis at later stages, such as anaphase Ⅰ, telophase Ⅰ and meiosis Ⅱwere generally normal. The study on genome separation and related chromosome behaviorsin new resynthesized B. napus is of importance for phylogenic study, breeding and transgenic risk control of this crop. The factors causing chromosome change in the initial generations were discussed in this paper as well.