ABSTRACT
Despite relatively tiny and numerous chromosomes, cytogenetic studies on Brassica species have a very long history. The fi rst chromosome analyses in the genus are from the beginning of the 20th century (Takamine 1916; Karpechenko 1922; Morinaga 1928, 1933, 1934; U 1935). Takamine (1916), Karpechenko, (1922) and Morinaga (1933, 1934) reported the chromosome numbers of the economically important species within the Brassica genus. Since that time, chromosome numbers have been determined for more than 1,500 different Brassicaceae taxa (summarized in Warwick and AlShehbaz 2006). Chromosome numbers for vegetable Brassicas are shown in Table 6-1.
