Abstract
A gel electrophoretic study has been carried out on the seed isoenzymes of n = 10 members of the genus Brassica. Eleven isoenzyme systems have been studied and the distribution of the isoenzymes used to indicate a possible relationship between the major recognized taxa. Three basic centres of the complex have been indicated: Indo-European, China and Mediterranean as exemplified by B. campestris (turnip/turnip-rape), B. chinensis and B. tournefortii (wild turnip) respectively.