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Project Abstract: Identify advanced dry bean breeding lines or co-op entries with resistance to common bacterial blight, anthracnose and white mold. Develop new methods for controlling halo blight in dry beans

The primary focus of sub-activity 14 is to assess coop entries, germplasm lines and advanced breeding lines from AAFC Dry Bean Breeding programs for their reactions to anthracnose, common bacterial blight (CBB) and white mould. 

From 2013 to 2016, the incidence and severity of CBB in 24 to 28 entries in the Long Season Wide Row Dry Bean Cooperative trial (LSWRC) were evaluated at four field sites in Manitoba.  Each year, an irrigated site at Morden was set up to screen the entries in the LSWRC for the incidence and severity of white mould.  For the last four years, many controlled environment tests of 71 to 92 entries in three bean coop trials to determine their seedling reactions to races 73 and 105 of the bean anthracnose fungus.  Each year, the results from those studies was submitted to the Prairie Registration Recommending Committee for Pulses and Special Crops of the Prairie Grain Recommending Committee to help determine the second-year coop entries that were suitable for registration as commercial dry bean cultivars in Canada.  The disease data generated from those studies has supported the registration of six dry bean cultivars from AAFC breeding programs.  These new dry bean cultivars included the great northern bean AAC Whitestar, the pinto bean AAC Burdett, the yellow beans AAC Y012 and AAC Y015, the cranberry bean line L12CB004 and the CBB resistant black bean cultivar AAC Black Diamond 2. 

Resistance to CBB is a relatively new trait in dry beans, so it is important to compare different sources of resistance and determine their effectiveness in reducing disease symptoms and in preventing yield losses.  A three-year field study showed that sources of CBB resistance differed in their ability to decrease disease symptoms and yield losses.  Yield losses in susceptible cultivars were as high as 36% and ranged between 0% and 17% in resistant cultivars.

Annual tests of advanced breeding lines for CBB resistance have identified many well adapted, high yielding bean lines with excellent CBB resistance under conditions that were highly conducive for CBB development on susceptible cultivars.  This research led to the registration of the AAC Black Diamond 2 as the first CBB resistant black bean cultivar in western Canada.  This ongoing research continues to identify CBB resistance in elite breeding lines from all the major market classes of dry beans.

Bean anthracnose is a seed-borne disease that has caused severe losses in seed yield and quality in dry beans.  The occurrence of new races can results in widespread outbreaks of anthracnose, so surveys of commercial bean fields are carried out annually to detect new races of the pathogen.  In recent years, five races of the anthracnose fungus have been identified in Canada and those races are being used to assess new sources of resistance for use in breeding programs.  Recently, the screening of 56 black bean germplasm lines for their reactions to multiple races of anthracnose and molecular genetic tests of that germplasm revealed at least five different major resistance genes. 

 

Project lead: Dr. Robert Conner (204) 822-7221 robert.conner@agr.gc.ca

 

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