Journal
PHYTOPATHOLOGY
Volume 94, Issue 6, Pages 578-583Publisher
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/PHYTO.2004.94.6.578
Keywords
blackleg; Phoma lingam
Categories
Ask authors/readers for more resources
Two types of genetic resistance to Leptosphaeria maculans usually are distinguished in Brassico napus: qualitative, total resistance expressed at the seedling stage and quantitative, partial resistance expressed at the adult plant stage. The latter is under the control of many genetic factors that have been mapped through quantitative trait loci (QTL) studies using 'Darmor' resistance. The former usually is ascribed to race-specific resistance controlled by single resistance to L. maculans (Rlm) genes. Three B. napits-originating specific Rln genes (Rlm1. Rlm2. and Rlm4) previously were characterized. Here, we report on the genetic identification of two novel resistance genes, Rlm3 and Rlm7, corresponding to the avirulence genes AvrLm3 and AvrLm7. The identification of a novel L. maculans-B. napus specific interaction allowed the detection of another putative new specific resistance gene, Rlm9. The resistance genes were mapped in two genomic regions on LG10 and LG16 linkage groups. A cluster of five resistance genes (Rlm1, RhO. RhO, Rhn7, and Rhn9) was strongly Suggested on LG10. The relation between all these specific resistance genes and their potential role in adult-plant field resistance is discussed. These two Rlm-carrying regions do not correspond to major QTL for Darmor quantitative resistance.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available