A full set of monosomic addition lines in Beta vulgaris from Beta webbiana: morphology and isozyme markers.
Nine different monosomic additions in Beta vulgaris from B. webbiana were characterized through morphological characters and isozyme markers. The effect of the alien chromosome on the morphology of the recipient species is chromosome specific, and nine morphotypes could be distinguished. The added chromosome caused a growth reduction in the recipient plants. Eleven isozyme systems were used as marker systems. A glucose-6-phosphate dehydrogenase (6PGDH) band was found as a marker for chromosome 7, which contains a resistance gene for the beet cyst nematode (Heterodera schachtii) in monosomic additions from B. procumbens and B. webbiana. A difference in the 6PGDH zymogram pattern between the two species with respect to this chromosome has been noted.