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Abstract Detail

Host/Plant Pathogen Interactions and Plant Health Management

Martinez, Paulina Cholango [1], Hucl, P [2], Kutcher, R [3].

Variation for virulence of Septoria triseti on genotypes of canary seed.

An understanding of virulence within pathogen populations is important for the development of durable disease resistance in crops. Leaf mottle caused by Septoria triseti, is the most common disease of canary seed (Phalaris canariensis) in Saskatchewan. To date, there has been little genetic characterization of this pathogen. The objective of this project was to quantify the variation for virulence in the S. triseti population from Saskatchewan on 24 canary seed genotypes under controlled environmental conditions. A total of 14 isolates of S. triseti were collected during 2007 and 2013. At the three leaf stage, seedlings were inoculated with a conidial suspension of each isolate in replicated experiments. At 10 days after inoculation, leaf mottle infection type were measured using a 0-5 scale; 0 denoting no symptoms and 5 being highly susceptible as defined by large lesions with profuse pynidia production. Infection types of ≤2 were classified as a resistant reaction and >2 as susceptible. Eleven pathotypes were identified among the 14 isolates evaluated: four isolates were identical and ten unique. Among the 24 canary seed genotypes, there were two and seven genotypes which had identical reactions to Septoria triseti. The differential interactions observed between pathogen isolates and host plant genotypes suggest gene-for-gene interactions.

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1 - University of Saskatchewan, Plant Science, 51 Campus Dr, Saskatoon, Saskatchewan, S7N 5A8, Canada
2 - University of Saskatchewan, Plant Science, 51 Campus Drive, Saskatoon, Saskatchewan, S7N 5A8, Canada
3 - University of Saskatchewan , Plant Science, Campus Drive, Saskatoon, S7N 5A8, Canada

Septoria triseti
Canary seed.

Presentation Type: Oral Paper:Papers for Topics
Session: 46
Location: Salon 2/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 3:00 PM
Number: 46007
Abstract ID:953
Candidate for Awards:CPS Best Student Presentation Awards

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