Genetic Control of Five Isozyme Systems in Sugar Beet (Beta vulgaris L.)

Genetic markers are most useful in plant breeding but so far only a few morphological and isozyme markers are known in Beta vulgaris. In this paper, the isozyme systems aconitase (AGO), NADH‐:dihydrolipoamiddehydrogenase (DIA), esterase (EST), fructose‐1,6‐bisphosphatase (FDP), and hexokinase (HK) were genetically analysed. Isoelectric focussing (IEF), vertical polyacrylamide gel electrophoresis (PAGE) and starch gel electrophoresis (SGE) were used to separate the isozymes. A total of eight loci could be identified. The allelic forms of Aco‐1, Dia‐1, Est‐1, Est‐5 and Hk‐1 are active monomers. The gene products of Est‐3 and Fdp‐2 are active as dimers. Est‐2 also showed allelic forms without activity; null‐alleles.