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- W1987187311 abstract "ABSTRACT The Brassica napus-B. juncea recombinant line (MX), resistant to Leptosphaeria maculans, was produced by interspecific crosses and bears one gene (Jlm1) from the B. juncea B genome. We investigated whether this new resistance was race specific by characterizing protection against a large sample of L. maculans isolates. The pathogenicity of 119 isolates of L. maculans comprising 105 A-group isolates and 14 B-group isolates was studied at the cotyledon stage under controlled conditions using the MX line, the susceptible B. napus cultivar Westar, and the resistant B. juncea cultivar Picra. All but one of the isolates were pathogenic on 'Westar'. Only 3 of the 105 A-group isolates caused very mild symptoms on 'Picra'. Two of these strains were isolated from the MX line and the other from Sinapis arvensis. The other 102 strains caused hypersensitive-type responses. Most B-group isolates were pathogenic on 'Picra'. There were differences in pathogenicity among A-group isolates tested on the MX line, whereas all B-group isolates were pathogenic on this line. A-group isolates obtained from the MX line were more frequently pathogenic on the MX line than those obtained from B. napus cultivars. One isolate from S. arvensis infected the MX line. These results suggest that the resistance of the MX line is unlikely to be durable. Thus, the new resistance gene Jlm1 should probably be used in association with other sources of resistance, in plant breeding schemes, to prevent the breakdown of this resistance." @default.
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- W1987187311 date "1999-02-01" @default.
- W1987187311 modified "2023-09-29" @default.
- W1987187311 title "Pathogenicity of Leptosphaeria maculans Isolates on a Brassica napus-B. juncea Recombinant Line" @default.
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- W1987187311 doi "https://doi.org/10.1094/phyto.1999.89.2.169" @default.
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