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Presence in Leptosphaeria maculans populations of isolates virulent on resistance introgressed into Brassica napus from the B. nigra B genome by H. Brun; D. Ruer; S. Levivier; I. Somda; M. Renard; A. M. Chèvre is a Agricultural and Biological Sciences article available to read on EtoBox.

What is Presence in Leptosphaeria maculans populations of isolates virulent on resistance introgressed into Brassica napus from the B. nigra B genome about?

The resistance carried by chromosome 4 of the __Brassica__ B genome confers on the __Brassica napus–B. nigra__ addition line ‘LA4+’ a high level of resistance to __Leptosphaeria maculans__ isolates at the cotyledon stage under controlled conditions and at all growth stages under field conditions. This resistance has never been used commercially in __B. napus__ varieties. To determine the potential durability of this new resistance, it is necessary to investigate whether it exerts selective pressure on fungus populations. A study of the pathogenicity of 57 single ascospore isolates of __L. maculans__ on this line at the cotyledon stage was carried out to examine possible race specificity of the resistance. Two isolates were clearly virulent and three had intermediate aggressiveness on the ‘LA4+’ line. Two B‐group isolates and 53 A‐group isolates, including isolates from darkening tissue of resistant plants of the ‘LA4+’ line and cv. Junius (__B. nigra__), were virulent on the susceptible isogenic ‘LA–’ line. These results demonstrate that: (i) the resistance of the ‘LA4+’ oilseed rape line, conferred on __B. napus__ by __B. nigra__ chromosome 4, is race specific at the cotyledon sta

Who reads Presence in Leptosphaeria maculans populations of isolates virulent on resistance introgressed into Brassica napus from the B. nigra B genome?

Author

H. Brun; D. Ruer; S. Levivier; I. Somda; M. Renard; A. M. Chèvre

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0032-0862)

Published

2001

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)