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Author Brun, Hortense ♦ Chèvre, Anne-Marie ♦ Fitt, Bruce D. L. ♦ Powers, Stephen ♦ Besnard, Anne-Laure ♦ Ermel, Magali ♦ Huteau, Virginie ♦ Marquer, Bruno ♦ Eber, Frédérique ♦ Renard, Michel ♦ Andrivon, Didier
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher Wiley
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Life sciences; biology ♦ Physiology & related subjects ♦ Biochemistry ♦ Genetics and evolution ♦ Natural history of organisms ♦ Technology ♦ Medicine & health ♦ Human physiology ♦ Pharmacology and therapeutics
Subject Domain (in MeSH) Eukaryota ♦ Organisms ♦ Amino Acids, Peptides, and Proteins ♦ Chemicals and Drugs ♦ Genetic Phenomena ♦ Plant Physiological Phenomena ♦ Biological Sciences
Subject Keyword Discipline Botany ♦ Ascomycota ♦ Genetics ♦ Pathogenicity ♦ Brassica Napus ♦ Microbiology ♦ Genes, Plant ♦ Plant Diseases ♦ Alleles ♦ Carrier Proteins ♦ Crops, Agricultural ♦ Genotype ♦ Journal Article ♦ Research Support, Non-u.s. Gov't
Abstract It has frequently been hypothesized that quantitative resistance increases the durability of qualitative (R-gene mediated) resistance but supporting experimental evidence is rare. To test this hypothesis, near-isogenic lines with/without the R-gene Rlm6 introduced into two Brassica napus cultivars differing in quantitative resistance to Leptosphaeria maculans were used in a 5-yr field experiment. Recurrent selection of natural fungal populations was done annually on each of the four plant genotypes, using crop residues from each genotype to inoculate separately the four series of field trials for five consecutive cropping seasons. Severity of phoma stem canker was measured on each genotype and frequencies of avirulence alleles in L. maculans populations were estimated. Recurrent selection of virulent isolates by Rlm6 in a susceptible background rendered the resistance ineffective by the third cropping season. By contrast, the resistance was still effective after 5 yr of selection by the genotype combining this gene with quantitative resistance. No significant variation in the performance of quantitative resistance alone was noted over the course of the experiment. We conclude that quantitative resistance can increase the durability of Rlm6. We recommend combining quantitative resistance with R-gene mediated resistance to enhance disease control and crop production.
Description Country affiliation: France
Author Affiliation: Brun H ( INRA, Agrocampus Ouest, Univ. Rennes1, UMR1099 BiO3P (Biology of Organisms and Populations applied to Plant Protection), F-35653 Le Rheu, France. Hortense.Brun@rennes.inra.fr)
ISSN 0028646X
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2010-01-01
Publisher Place Great Britain (UK)
e-ISSN 14698137
Journal New Phytologist
Volume Number 185
Issue Number 1


Source: WHO-Global Index Medicus