scholarly journals Effects of fungicides on in vitro spore germination and mycelial growth of the phytopathogens Leptosphaeria maculans and L. biglobosa (phoma stem canker of oilseed rape)

2009 ◽  
Vol 66 (4) ◽  
pp. 396-405 ◽  
Author(s):  
Maria R Eckert ◽  
Stephen Rossall ◽  
Andrew Selley ◽  
Bruce DL Fitt
Keyword(s):  
Oilseed Rape ◽  
Spore Germination ◽  
Mycelial Growth ◽  
Leptosphaeria Maculans ◽  
Stem Canker ◽  
Phoma Stem Canker

scholarly journals Effectiveness of Rlm7 resistance against Leptosphaeria maculans (phoma stem canker) in UK winter oilseed rape cultivars

2018 ◽  
Vol 67 (6) ◽  
pp. 1339-1353 ◽  
Author(s):  
G. K. Mitrousia ◽  
Y. J. Huang ◽  
A. Qi ◽  
S. N. M. Sidique ◽  
B. D. L. Fitt
Keyword(s):  
Oilseed Rape ◽  
Leptosphaeria Maculans ◽  
Stem Canker ◽  
Winter Oilseed Rape ◽  
Phoma Stem Canker

scholarly journals Analysis of Leptosphaeria maculans Race Structure in a Worldwide Collection of Isolates

2005 ◽  
Vol 95 (9) ◽  
pp. 1061-1071 ◽  
Author(s):  
M. H. Balesdent ◽  
M. J. Barbetti ◽  
Hua Li ◽  
K. Sivasithamparam ◽  
L. Gout ◽  
...  
Keyword(s):  
Resistance Gene ◽  
Oilseed Rape ◽  
Leptosphaeria Maculans ◽  
Stem Canker ◽  
Allele Frequencies ◽  
Gene Interactions ◽  
Avr Gene ◽  
Avr Genes ◽  
Structure Diversity

Leptosphaeria maculans, the causal agent of stem canker of oilseed rape, develops gene-for-gene interactions with its hosts. To date, eight L. maculans avirulence (Avr) genes, AvrLm1 to AvrLm8, have been genetically characterized. An additional Avr gene, AvrLm9, that interacts with the resistance gene Rlm9, was genetically characterized here following in vitro crosses of the pathogen. A worldwide collection of 63 isolates, including the International Blackleg of Crucifers Network collection, was genotyped at these nine Avr loci. In a first step, isolates were classified into pathogenicity groups (PGs) using two published differential sets. This analysis revealed geographical disparities as regards the proportion of each PG. Genotyping of isolates at all Avr loci confirmed the disparities between continents, in terms of Avr allele frequencies, particularly for AvrLm2, AvrLm3, AvrLm7, AvrLm8, and AvrLm9, or in terms of race structure, diversity, and complexity. Twenty-six distinct races were identified in the collection. A larger number of races (n = 18) was found in Australia than in Europe (n = 8). Mean number of virulence alleles per isolate was also higher in Australia (5.11 virulence alleles) than in Europe (4.33) and Canada (3.46). Due to the diversity of populations of L. maculans evidenced here at the race level, a new, open terminology is proposed for L. maculans race designation, indicating all Avr loci for which the isolate is avirulent.

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