Abstract:
:The propensity of a fungal pathogen to evolve virulence depends on features of its biology (e.g. mode of reproduction) and of its genome (e.g. amount of repetitive DNA). Populations of Leptosphaeria maculans, a pathogen of Brassica napus (canola), can evolve and overcome disease resistance bred into canola within three years of commercial release of a cultivar. Avirulence effector genes are key fungal genes that are complementary to resistance genes. In L. maculans these genes are embedded within inactivated transposable elements in genomic regions where they are readily mutated or deleted. The risk of resistance breakdown in the field can be minimised by monitoring disease severity of canola cultivars and virulence of fungal populations using high throughput molecular assays and by sowing canola cultivars with different resistance genes in subsequent years. This strategy has been exploited to avert yield losses due to blackleg disease in Australia.
journal_name
Mycologiajournal_title
Mycologiaauthors
Howlett BJ,Lowe RG,Marcroft SJ,van de Wouw APdoi
10.3852/14-317subject
Has Abstractpub_date
2015-05-01 00:00:00pages
441-51issue
3eissn
0027-5514issn
1557-2536pii
14-317journal_volume
107pub_type
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