Breakdown of a Brassica rapa subsp. sylvestris Single Dominant Blackleg Resistance Gene in B. napus Rapeseed by Leptosphaeria maculans Field Isolates in Australia

Plant Disease
H LiM J Barbetti

Abstract

Blackleg, caused by Leptosphaeria maculans, is a major disease of oilseed rape (Brassica napus) grown in Canada, Europe, and Australia. Cv. Surpass 400 was released in Australia in 2000 as the most resistant cultivar to L. maculans. It carries a single dominant resistance gene from B. rapa subsp. sylvestris. This cultivar usually shows a hypersensitive response to L. maculans characterized by small, dark brown lesions that are necrotic, localized, and without pycnidia on cotyledons, leaves, and stems. However, in 2001 on a Western Australian experimental farm, a small proportion of the lesions on the lower stem and crown region of cv. Surpass 400 were typical of those observed in susceptible cultivars, which were brown, necrotic lesions with a darker margin, but they contained fewer pycnidia. Forty seedlings of cv. Surpass 400 and susceptible cv. Westar were inoculated with pycnidiospore suspensions (106/ml) of each of 18 isolates taken from lesions on cv. Surpass 400. All 18 isolates caused collapse of cotyledons of susceptible cv. Westar. Four of these isolates caused large cotyledon lesions with some pycnidia on cv. Surpass 400. Three of these four isolates were subsequently inoculated onto 60 seedlings per isolate, at each ...Continue Reading

Citations

Mar 22, 2008·Genome Génome / Conseil National De Recherches Canada·Fengqun YuS Roger Rimmer
Mar 29, 2012·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Rosy RamanHarsh Raman
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Jun 27, 2012·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Fengqun YuS Roger Rimmer
Nov 23, 2017·Frontiers in Plant Science·Ting Xiang NeikJacqueline Batley
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Nov 17, 2020·Frontiers in Cellular and Infection Microbiology·Niroshini GunasingheStephen Neate

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