Genetic control and host range of avirulence toward Brassica napus cultivars quinta and jet neuf in Leptosphaeria maculans

• Published in: Phytopathology Vol. 91; no. 1; pp. 70 - 76
• Main Authors: BALESDENT, M. H, ATTARD, A, ANSAN-MELAYAH, D, DELOURME, R, RENARD, M, ROUXEL, T
• Format: Journal Article
• Language: English
• Published: St. Paul, MN American Phytopathological Society 2001
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Fundamental and applied biological sciences. Psychology; Genetics and breeding of economic plants; Life Sciences; Pest resistance; Phytopathology and phytopharmacy; Plant pathogens; Varietal selection. Specialized plant breeding, plant breeding aims; Vegetal Biology; Plant pathogen; Gene interaction; Variety trial; Oil plant(vegetal); Fungus resistance; Fungi; Leptosphaeria maculans; Cruciferae; Dicotyledones; Angiospermae; Brassica napus; Host range; Ascomycetes; Spermatophyta; Avirulence; Thallophyta; Cultivar; POUVOIR PATHOGENE
• ISSN: 0031-949X; 1943-7684; 0031-949X
• DOI: 10.1094/PHYTO.2001.91.1.70

ABSTRACT Leptosphaeria maculans causes blackleg of oilseed rape. Gene-for-gene interactions between race PG3 and Brassica napus cv. Quinta were related to interaction between the fungal avirulence (Avr) gene AvrLm1 and the corresponding resistance gene Rlm1. AvrLm1 isolates were aviru-lent on cvs. Doublol, Vivol, Columbus, and Capitol, and no recombinant phenotypes were observed in the progeny of two AvrLm1 x avrLm1 crosses, suggesting that all of these cultivars may possess Rlm1 or genes displaying the same recognition spectrum, or that a cluster of Avr genes is present at the Avrlm1 locus. In one cross, segregation distortion was observed at the AvrLm1 locus that could be explained by interaction between AvrLm1 and one unlinked deleterious gene, termed Del1. Incompatibility toward cvs. Jet Neuf and Darmor.bzh was governed by a single gene, unlinked to AvrLm1 or Del1. This avirulence gene was termed AvrLm4. Preliminary plant genetic analysis suggested the occurrence of a corresponding dominant resistance gene, termed Rlm4, present in the Quinta line analyzed and linked to Rlm1.