Abstract
Nine different monosomic additions in Beta vulgaris from Beta 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 6PGDH band was found as a marker for chromosome 7, which contains a resistance gene for the beet cyst nematode in monosomic additions from Beta procumbens and Beta webbiana. A difference in the 6PGDH zymogram pattern between the two species with respect to this chromosome has been noted.
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