Folia Horticulturae

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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 obtained.

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.