Abstract Detail

Host/Plant Pathogen Interactions and Plant Health Management

Rashid, Khalid Y. [1].

Host-Pathogen interactions between flax and Septoria linicola causing pasmo disease in flax.

Pasmo is a major disease affecting flax, and is prevalent in most flax growing areas worldwide. The incidence and severity of this disease have been on the rise in Canada and the USA in the last two decades causing major reductions in yield and quality of the seed and fibre. Efforts to screen for sources of genetic resistance to this pathogen in commercial flax cultivars and world collection of flax accessions resulted in identifying several flax genotypes with moderate field resistance. Selections with field resistance were challenged with several single-spore isolate of S. linicola under growth room controlled conditions. The results showed specific interactions between certain flax genotypes and the single-spore isolates of this pathogen with some flax genotypes conferring resistance to one, two or three isolates indicating the potential for race-specific genetic resistance in flax to this pathogen. The results also demonstrated the differentiation in virulence among the single-spore isolates. Some flax genotypes showed reduced level of infection on leaves and stems which may be due to partial resistance to either leaf or stem infections. Pyramiding such race-specific genes for resistance to pasmo in flax genotypes with partial field resistance will improve the field resistance to this pathogen and reduce the losses in yield and quality.

1 - Agriculture and Agri-Food Canada (AAFC), Science and Technology Branch, Cereal Research Centre, Morden, 101 Route 100, Morden, Manitoba, R6M 1Y5, Canada

Keywords:
Flax
pasmo
Septoria linicola
Linum usitatissimum
Plant-Pathogen Interaction
Genetic resistance
Pathogen variability.

Presentation Type: Oral Paper:Papers for Topics
Session: 46
Location: Salon 2/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 2:30 PM
Number: 46005
Abstract ID:145
Candidate for Awards:None