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Abstract Detail

Host/Plant Pathogen Interactions and Plant Health Management

McCallum, Brent [1], Thomas, Julian [1].

Wheat leaf rustresistance gene Lr34 appears to have an effect on Fusarium head blight in wheat.

The wheat leaf rust (Puccinia triticina Eriks.) resistance gene Lr34 conditions adult plant, slow rusting, race non-specific resistance that has been durable in wheat over many years. It also provides resistance to stem rust, stripe rust and other biotrophic diseases. Lr34 has been used extensively in Canadian wheat germplasm because of these positive effects on a number of different diseases. Fusarium head blight (FHB) is one of the most important diseases in wheat in Canada and other countries. It causes yield losses but also mycotoxins can accumulate in the infected grain which make it unfit for consumption. We investigated the effect of Lr34 on FHB using pairs of near isogenic sister lines from the cross Sumai*6/Thatcher. One member of each pair of sister lines contained Lr34 while the other member did not, otherwise the sister lines were very similar to the recurrent parent Sumai 3. Sumai 3 was chosen as a parent because of its high level of resistance to FHB. There were approximately 20 pairs of sister lines evaluated during 2012, 2013 and 2014 for FHB in field nurseries, inoculated with Fusarium graminearum Schwabe and irrigated regularly, which resulted in high levels of FHB. In most pairs of lines, in most years, the sister line with Lr34 was more resistant to FHB than the sister line without Lr34.

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1 - Cereal Research Centre, Agriculture and Agri-Food Canada, 101 Route 100, Morden, MB, R6M 1Y5, Canada

leaf rust

Presentation Type: Oral Paper:Papers for Topics
Session: 46
Location: Salon 2/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 2:45 PM
Number: 46006
Abstract ID:324
Candidate for Awards:None

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