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Potential impact of weedy Brassicaceae species on oil and meal quality of oilseed rape (canola) in Australia

Salisbury, P A, Potter, T D, Gurung, A M, Mailer, R J, Williams, W M
Weed research 2018 v.58 no.3 pp. 200-209
Brassica napus, canola, crops, erucic acid, flowering, glucosinolates, oils, weeds, Australia
Brassicaceae weeds are a widespread problem in Australian oilseed rape crops. The weeds not only compete for resources during crop growth, but also have the potential to reduce both oil and meal quality of the harvested crop. This study investigated oil and meal quality of weedy species from the Brassicaceae family that were collected throughout cropping regions of Australia. Eighty‐nine lines from 19 species were grown and evaluated in the same environment for their potential to contaminate Australian oilseed rape seed lots. Seed and flowering characteristics of each species were also examined. The glucosinolate concentration of most of the weedy species was greater than 100 μmol g⁻¹ of oil‐free meal, well above the threshold for meeting oilseed rape quality. Erucic acid content of 18 of the 19 weedy species also exceeded the oilseed rape quality standard of less than 2% erucic acid. This study highlights the potential of the weedy species to reduce the quality of Australian oilseed rape crops.