Plant Breeding (2003) 122, 485-488

C.-X. Li and W.A. Cowling (2003)
Identification of a single dominant allele for resistance to blackleg in Brassica napus 'Surpass 400'
Plant Breeding 122 (6), 485-488
Abstract: The inheritance of resistance to blackleg (caused by Leptosphaeria maculans) was examined in the F₁ and F₂ of a cross between highly resistant canola 'Surpass 400' and susceptible 'Westar' in the field. Blackleg-infected canola straw was collected from the field and scattered among plants to increase disease development with the aid of natural rainfall. Disease severity on seedlings was assessed as the average number of lesions on leaves 1 and 2, and on adult plants as the percentage necrosis on a cross-section of stems immediately above the crown. All 'Westar' plants were susceptible (S) and all 'Surpass 400' and F₁ plants were resistant (R) at both growth stages. Disease severity on F₂ plants segregated 3 : 1 (R : S) as expected for a single dominant resistance allele in both the seedling and adult plant stages. There was a high proportion (91.1%) of matching reactions (R-R and S-S) between seedling and adult plants. 'Surpass 400' is the source of a single dominant allele for blackleg resistance in Brassica napus that is expressed strongly in both seedlings and adult plants.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Caixia Li

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Plenodomus lingam	Rape/canola (Brassica napus)