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Twenty oilseed Brassica breeding populations derived from mass selection or inter-specific hybridization were field screened for resistance to three separate isolates of Sclerotinia sclerotiorum,the cause of Sclerotinia stem rot (SSR).Variation due to S.sclerotiorum isolates and host populations were highly significant,as were populations x isolate interactions.Isolates MBRS1 and MBRS5 were the most pathogenic and almost similar in terms of population reactions,with WW3 clearly being distinct and having a much smaller range in disease severity across populations.