Genetic behavior of resistance to the beet cyst nematode (Heterodera schachtii Schm) in radish (Raphanus sativus L.)

摘要

The genetic nature of resistance to the beet cyst nematode (BCN) (Heterodera schachtiiSchm) in oil radish was investigated. A segregating population consisted of 245 F2individuals derived from self-pollinated single F1?plant of the radish cross ‘Pegletta X Siletta nova’ was used. Four oil radish populations and one?Brassica napus?cv. “Madora” as susceptible control were examined for the resistance to the BCN. The number of cysts found on the root system of radish plants and the attached soil were used for resistance criteria. The results showed that all F1?plants appeared in the resistance parent classes, which reflected the dominant behavior of the resistant gene(s). A bimodal distribution was observed for the F2?population. The F2?individuals distributed in two discreet phenotype classes, complying with the assumption of monogenic dominant inheritance of the BCN resistance in oil radish.