title: Wheat archive links long-term fungal pathogen population dynamics to air pollution.
abstract: We used the PCR to study the presence of two plant pathogens in archived wheat samples from a long-term experiment started in 1843. The data were used to construct a unique 160-yr time-series of the abundance of Phaeosphaeria nodorum and Mycosphaerella graminicola, two important pathogens of wheat. During the period since 1970, the relative abundance of DNA of these two pathogens in the samples has reflected the relative importance of the two wheat diseases they cause in U.K. disease surveys. Unexpectedly, changes in the ratio of the pathogens over the 160-yr period were very strongly correlated with changes in atmospheric pollution, as measured by SO(2) emissions. This finding suggests that long-term, economically important, changes in pathogen populations can be influenced by anthropogenically induced environmental changes.
authors.affiliation: School of Plant Sciences, University of Reading, Whiteknights, Reading, Berkshire RG6 6AS, United Kingdom.
authors.forename: Sarah J
authors.initials: SJ
authors.lastname: Bearchell
authors.forename: Bart A
authors.initials: BA
authors.lastname: Fraaije
authors.forename: Michael W
authors.initials: MW
authors.lastname: Shaw
authors.forename: Bruce D L
authors.initials: BD
authors.lastname: Fitt
mesh_terms: D000397:Air Pollution; D018070:Biological Specimen Banks; D004271:DNA, Fungal / Q000032:analysis / Q000235:genetics; D004739:England; D005658:Fungi / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology*; D010935:Plant Diseases / Q000382:microbiology* / Q000706:statistics & numerical data*; D016133:Polymerase Chain Reaction; D011157:Population Dynamics; D015203:Reproducibility of Results; D014908:Triticum / Q000382:microbiology*
chemical_list: D004271:DNA, Fungal