Fitness consequences of infection of <Emphasis Type="Italic">Arabidopsis thaliana</Emphasis> with its natural bacterial pathogen <Emphasis Type="Italic">Pseudomonas viridiflava</Emphasis> |
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Authors: | Erica M Goss Joy Bergelson |
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Institution: | (1) Department of Ecology and Evolution, University of Chicago, 1101 E. 57th Street, Chicago, IL 60637, USA;(2) Horticultural Crops Research Laboratory, USDA Agricultural Research Service, 3420 NW Orchard Ave., Corvallis, OR 97330, USA |
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Abstract: | Variation in plant resistance to pathogen infection is commonly observed in interactions between wild plants and their foliar
pathogens. Models of host–pathogen interactions indicate that a large cost of infection is generally necessary to maintain
this variation, yet there is limited evidence that foliar pathogens cause detectable fitness reductions in wild host plants.
Most published work has focused on fungal pathogens. Pseudomonas viridiflava, a common bacterial pathogen of the annual weed Arabidopsis thaliana across its range, comprises two distinct genetic clades that cause disease symptoms of different severity. Here we measured
the extent of infection of wild A. thaliana populations in the Midwest, USA, and examined the effect on seed production, in field and growth-chamber experiments, of
experimental inoculation with isolates from the two clades. We found infection with P. viridiflava varied from 0 to 56% in Midwest A. thaliana populations, with the possibility of several leaves per plant infected later in the growing season. In the growth chambers,
experimental inoculation reduced seed set by averages of 15 and 11% for clades A and B, respectively. In the field experiment,
only clade A affected plant fitness significantly, reducing seed set by an average of 38%. Underlying these average effects
we observed both negative and positive effects of infection, and variation in both fitness among plant genotypes and sensitivity
to environmental conditions. |
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Keywords: | Resistance Susceptibility Virulence Tolerance Plant– pathogen interaction |
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