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Abstract Detail



Mycological Section

Li, Xiujie Susie [1], Yang, Jian [2], Lange, Ralph [3].

Evaluation of the toxicity of the secondary metabolites produced by Leptosphaeria maculans and its levels in Alberta canola.

In this study sirodesmin PL was produced from a L. maculans strain Leroy #127 isolated from canola and its mammalian toxicity was determined. We found that sirodesmin PL has comparable toxicity to gliotoxin. A survey was also conducted throughout Alberta to determine the level of sirodesmin PL in canola. No sirodesmin PL was found in surveyed canola products. This includes canola seeds collected from blackleg infected fields including seeds with very high levels of L. maculans contamination. No sirodesmin PL was detected in canola oil or canola meal obtained from processors or retailers. We conclude that the likely reasons for this include low levels of blackleg contamination in seed from commercial fields, combined with low levels of toxin production by many isolates. Put colloquially, seed contamination levels are low, and even if seed is contaminated, it is not necessarily contaminated with fungal strains that produce appreciable amounts of toxin. We therefore reason that sirodesmin PL contamination does not present a serious risk to the Canadian canola industry. Moreover, we predict that sirodesmin levels in Canadian harvested canola seed is unlikely to increase over time, even though pathogen populations appear to be adapting to the resistance genetics of Canadian B. napus cultivars, possibly leading to more frequent blackleg epidemics in the future. The toxin production of the isolates we examined was not associated with virulence; some of the most virulent isolates (towards recent B. napus cultivars) also produced the lowest levels of toxin.


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1 - Alberta Innovates Technology Futures, Food and Ag, Hwy 16A 75th Street, Vegreville, AB, T9C1t4, Canada
2 - Alberta Innovates - Technology Futures, Food and Ag, Hwy 16A 75th Street, Vegreville, AB, T9C 1T4, Canada
3 - Alberta Innovates Technology Futures, Food and Ag, Hwy 16A 75th Street, Vegreville, AB, T9C 1T4, Canada

Keywords:
none specified

Presentation Type: Oral Paper:Papers for Sections
Session: 74
Location: Salon 1/The Shaw Conference Centre
Date: Wednesday, July 29th, 2015
Time: 5:00 PM
Number: 74006
Abstract ID:1209
Candidate for Awards:None


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