Resistance investigations to clubroot in di- and tetraploid forms of cabbage, oil radish and radish
Henryk O. Mackiewicz
Genetics and Plant Breeding Department
Research Institute of Vegetable Crops
Reguły, 05-815 Opacz, Poland
Investigations made to obtain 4n forms of cabbage were begun in 1956
(Forma 4n), in 1957 for oil radish (cv. Tetra Poznańska) and in 1960 for
small radish (cv. Tetra Ilowiecka). In 1974 breeding work on developing 2n
and 4n forms non-susceptible to clubroot - Plasmodiophora brassicae
Woronin were started.
The obtained results of the author and B. Nowicki, showed that 4n were more resistant to clubroot in
comparison to 2n forms. The degree of infestation expressed as an index
(I. Pl.) using a 6 point scale was as follows: for cabbage 2n=0.77, 4n=0.36; oil radish 2n=0.05, 4n=0;
small radish 2n=0.19, 4n=0. Also, 2n forms of cabbage with a low degree of infestation I. Pl.=0.12 were
Mackiewicz H.O., 1989. Resistance investigations to clubroot in di- and tetraploid
forms of cabbage, oil radish and radish. Folia Horticulturae I/2: 87-94.