Genotype, environment, and genotype by environment interactions determine quantitative resistance to leaf rust (Coleosporium asterum) in Euthamia graminifolia (Asteraceae)

•  The strength and consistency of genotypic differences in disease resistance determine the potential for resistance evolution in host populations that rely on vegetative reproduction. Here we surveyed infection intensity of host genotypes across space and time to estimate genotypic and environment...

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Veröffentlicht in:The New phytologist. - 1979. - 162(2004), 3 vom: 20. Juni, Seite 729-743
1. Verfasser: Price, Jason S (VerfasserIn)
Weitere Verfasser: Bever, James D, Clay, Keith
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2004
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Coleosporium asterum Euthamia graminifolia (=Solidago graminifolia (Goldenrod)) clonal plant environmental variation fungal pathogen genotypic basis logistic analysis quantitative disease resistance
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245 1 0 |a Genotype, environment, and genotype by environment interactions determine quantitative resistance to leaf rust (Coleosporium asterum) in Euthamia graminifolia (Asteraceae) 
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520 |a •  The strength and consistency of genotypic differences in disease resistance determine the potential for resistance evolution in host populations that rely on vegetative reproduction. Here we surveyed infection intensity of host genotypes across space and time to estimate genotypic and environmental effects on quantitative disease resistance. •  Cloned fragments of 12 Euthamia graminifolia genotypes were grown in unweeded experimental fields and outdoor pots. Infection intensity was surveyed during 2 yr of natural infection by the non-systemic rust pathogen, Coleosporium asterum. •  Five of six surveys detected infection intensity differences among genotypes, despite substantial variation in mean infection intensity across surveys. When resistance was defined relative to local pathogen density, 10-40% of resistance variation was due to host genotype. Although two genotypes exhibited greater resistance across environments, G × E interactions in resistance were common. Furthermore, infection intensity was unrelated to host size. •  We conclude that quantitative resistance level can evolve in this system and show how logistic analysis (relative to local pathogen density) can provide insight into the mechanism(s) responsible for G × E interactions in infection intensity 
650 4 |a Journal Article 
650 4 |a Coleosporium asterum 
650 4 |a Euthamia graminifolia (=Solidago graminifolia (Goldenrod)) 
650 4 |a clonal plant 
650 4 |a environmental variation 
650 4 |a fungal pathogen 
650 4 |a genotypic basis 
650 4 |a logistic analysis 
650 4 |a quantitative disease resistance 
700 1 |a Bever, James D  |e verfasserin  |4 aut 
700 1 |a Clay, Keith  |e verfasserin  |4 aut 
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