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Independent Inheritance of Avirulence and Dodine Resistance in Nectria haematococca var. cucurbitae. A. Kappas, Nuclear Research Center “Democritus”, Athens, Greece; S. G. Georgopoulos, Nuclear Research Center “Democritus”, Athens, Greece. Phytopathology 61:1093-1094. Accepted for publication 7 April 1971. DOI: 10.1094/Phyto-61-1093.

Of six dodine-resistant mutants of Nectria haematococca var. cucurbitae obtained in the laboratory, four were found less pathogenic to squash seedlings than the original wild-type strains. However, no definite effect of dodine resistance genes on pathogenicity could be concluded. In one case, appropriate genetic analysis showed the presence of a gene for reduced virulence which segregated independently of the gene for resistance to dodine present in the mutant strain.

Additional keywords: pathogenicity, squash root rot.