Usefulness of winter canola (Brassica napus) race-specific resistance genes against blackleg (causal agent Leptosphaeria maculans) in southern Australian growing conditions
K. A. Light A D , N. N. Gororo B and P. A. Salisbury C
+ Author Affiliations
- Author Affiliations
A Pacific Seeds Pty Ltd, Toowoomba, Qld 4350, Australia.
B Nuseed Pty Ltd, Horsham, Vic. 3400, Australia.
C Melbourne School of Land and Environment, University of Melbourne, Vic. 3010, Australia.
D Corresponding author. Email: kate.light@pacseeds.com.au
Crop and Pasture Science 62(2) 162-168 https://doi.org/10.1071/CP10187
Submitted: 28 May 2010 Accepted: 23 December 2010 Published: 17 February 2011
Abstract
Studies on the blackleg resistance of Brassica lines containing known race-specific, Rlm resistance genes can provide information on the potential use of these genes in the genetic improvement of Australian spring canola lines. Lines of four Brassica species (winter B. napus, B. nigra, B. juncea, B. rapa) containing one or more known specific Rlm genes were assessed for seedling and adult plant survival, on infected stubble derived from crops of both polygenic and B. rapa ssp. sylvestris resistance types, to determine their potential usefulness as sources of blackleg disease resistance in diverse environments in southern Australia. Seedling and adult plant resistance of lines differed depending on the stubble type used. The seedling and adult plant blackleg resistance of several lines containing the resistance genes Rlm1, Rlm1/Rlm3, Rlm7, and Rlm10 was consistently higher than the control line, AV-Sapphire, which carries polygenic resistance. The superior performance of these lines indicates that winter B. napus and B. nigra lines have outstanding potential for improving blackleg disease resistance under Australian conditions.
Additional keywords: adult plant resistance, polygenic, Rlm, seedling resistance, survival.
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