Ninety two genotypes of oilseed Brassica juncea and Brassica napus were evaluated over three environments for analysis of stability parameters in relation to Sclerotinia rot resistance with responsible characters viz: plant age at the time of inoculation, stem diameter, stem lesion length and percent plant wilted/dead. The analysis of variance for stability revealed the presence of genetic variability in studied material for all the characters. The linear component of Genotype X Environment interactions was significant for all the characters, which indicates that the major portion of interaction was linear in nature and prediction of stable genotype for Sclerotinia-rot resistance over the environments was possible. Therefore, genotypes AG Spectrum, RQ011, RH13 and Ringot were found stable for Sclerotinia-rot resistance under normal environmental conditions. However, under congenial environmental conditions only six genotypes namely JM018, Ag Outback, Monty, Brassica juncea 1, Brassica juncea 2 and Brassica juncea 3 were most stable for resistance, which may be utilized for further improving genetic base for Sclerotinia-rot resistance in oilseed Brassica.
Key words: Brassica juncea, Brassica napus, Sclerotinia-rot, stability.
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