GENETIC VARIATION IN REACTION TO SCLEROTINIA STEM ROT IN Brassica SPECIES

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Abstract
Twenty-five cultivars and strains representing five Brassica species [B. campestris, B. juncea, B. nigra, B. carinata, B. napus] were tested under controlled conditions for their reaction to infection by Sclerotinia sclerotiorum, the causal agent of sclerotinia stem rot. Using the rate of stem lesion expansion as an indicator of the resistance of stem tissue to the pathogen, significant differences were present between species and among cultivars/strains within species. Although S0 parent-S1 progeny heritability of stem lesion expansion was low, S0 plants of Brassica campestris and B. juncea with increased sclerotinia stem rot resistance could be selected.