| Abstract Detail
Host/Plant Pathogen Interactions and Plant Health Management Dalton, Jill [1], Gossen, Bruce [2], McDonald, Mary Ruth [1]. Effect of spore load on growth of clubroot-resistant canola. Clubroot caused by Plasmodiophora brassicae Woronin reduces yield in canola (Brassica napus L.). Genetic resistance is essential for clubroot management. However, studies indicate that high spore loads may reduce growth and delay development in clubroot-resistant canola cultivars. The objective of this research was to compare the growth response of clubroot-resistant canola to P. brassicae resting spore load in soil. In 2014, clubroot-resistant and susceptible canola was planted at two adjacent sites at the Muck Crops Research Station (Holland Marsh, Ontario) with the same soil type and agronomic practices, but differing in spore loads of P. brassicae. Plant height was measured weekly from 4-8 weeks after planting. Clubroot incidence and severity were assessed using a standard 0ΓΆ€‘3 rating scale. Severe clubroot (100 DSI) developed in susceptible canola at both sites. Resistant cultivars had no clubroot symptoms. At 8 weeks after planting, at Site 1 (7x105 spores g1 soil), plant height of resistant cultivars was 124% (±4.5) greater than the susceptible control. The proportion of resistant cultivars at flowering or pod development stage was 30% (±3.2) greater than the susceptible control. At 8 weeks after planting, at Site 2 (7x106 spores g1 soil), plant height of resistant canola was 46% (± 3.9) greater than the susceptible control. The proportion of resistant cultivars at flowering or pod development stage was 20% (±2.8) greater than the susceptible control. These field results support the observations from controlled environment trials that high concentrations of resting spores of P. brassicae cause reduced growth and delayed development of clubroot-resistant canola.
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1 - University of Guelph, Plant Agriculture, 50 Stone Road East, Guelph, Ontario, N1G 2W1, Canada
2 - Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, S7N 0X2, Canada
Keywords:
Clubroot
Brassica napus
Plasmodiophora brassicae.
Presentation Type: Poster:Posters for Topics
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PPA004
Abstract ID:1056
Candidate for Awards:CPS Best Student Presentation Awards |
