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Life-history strategy defends against disease and may select against physiological resistance

Artikel i vetenskaplig tidskrift
Författare A. K. Gibson
E. Petit
J. Mena-Ali
Bengt Oxelman
M. E. Hood
Publicerad i Ecology and Evolution
Volym 3
Nummer/häfte 6
Sidor 1741-1750
ISSN 2045-7758
Publiceringsår 2013
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 1741-1750
Språk en
Länkar dx.doi.org/10.1002/ece3.583
Ämnesord Annual, disease resistance, Microbotryum, perennial, Silene, anther-smut fungus, violacea microbotryum violaceum, parasite species, richness, ustilago-violacea, silene-alba, infectious-diseases, genotypic, variation, plant-disease, host shift, population, arnov el, 1973, american naturalist, v107, p791
Ämneskategorier Biologiska vetenskaper, Biologisk systematik

Sammanfattning

Host ecological traits may limit exposure to infectious disease, thereby generating the wide variation in disease incidence observed between host populations or species. The exclusion of disease by ecological traits may then allow selection to act against physiological defenses when they are costly to maintain in the absence of disease. This study investigates ecological resistance in the Silene-Microbotryum pathosystem. An estimated 80% of perennial Silene species host the anther-smut disease while no annuals harbor the disease in nature. Artificial inoculations of annual and perennial Silene plants, obtained from both natural and horticultural populations, demonstrate that the absence of disease in annuals is not explained by elevated physiological resistance. The annual habit is thus a powerful form of ecological defense against anther smut. Moreover, the higher susceptibility of annual species to anther smut relative to perennials supports the hypothesis of a loss of costly physiological resistance under ecological protection. The observation in annuals that physiological susceptibility is correlated with lower rates of flowering (i.e., lower fitness) suggests that variation in physiological resistance is costly in the absence of disease, even in a naїve Silene species. The absence of disease in natural populations of annuals combined with their high physiological susceptibility attest to the strength of host ecology in shaping the distribution of disease and to the dynamic nature of disease resistance.

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