DOI: 10.5061/dryad.7p5s7
title: Data from: Planting exotic relatives has increased the threat posed by Dothistroma septosporum to the Caledonian pine populations of Scotland

description: To manage emerging forest diseases and prevent their occurrence in the
 future, it is essential to determine the origin(s) of the pathogens
 involved and identify the management practices that have ultimately caused
 disease problems. One such practice is the widespread planting of exotic
 tree species within the range of related native taxa. This can lead to
 emerging forest disease both by facilitating introduction of exotic
 pathogens, and by providing susceptible hosts on which epidemics of native
 pathogens can develop. We used microsatellite markers to determine the
 origins of the pathogen Dothistroma septosporum responsible for the
 current outbreak of Dothistroma needle blight (DNB) on native Caledonian
 Scots pine (Pinus sylvestris) populations in Scotland, and evaluated the
 role played by widespread planting of two exotic pine species in the
 development of the disease outbreak. We distinguished three races of D.
 septosporum in Scotland, one of low genetic diversity associated with
 introduced lodgepole pine (Pinus contorta), one of high diversity probably
 derived from the DNB epidemic on introduced Corsican pine (Pinus nigra
 subsp. laricio) in England, and a third of intermediate diversity
 apparently endemic on Caledonian Scots pine. These races differed for both
 growth rate and exudate production in culture. Planting of exotic pine
 stands in the UK appears to have facilitated the introduction of two
 exotic races of D. septosporum into Scotland which now pose a threat to
 native Caledonian pines both directly and through potential hybridisation
 and introgression with the endemic race. Our results indicate that both
 removal of exotic species from the vicinity of Caledonian pine
 populations, and restriction of movement of planting material are required
 to minimise the impact of the current DNB outbreak. They also demonstrate
 that planting exotic species that are related to native species reduces
 rather than enhances the resilience of forests to pathogens.
description: Exudate production and
 Growth rates for Dothistroma septosporumThis excel file has four
 pages. The first page lists the 45 isolates from the three races used in
 the experiment. The isolates come from three races - LPR green, SR orange
 and NPR blue - and within each race 5 isolates are sampled from each of
 three populations. The second, third and fourth pages give the exudate
 (here referred to as toxin) production scores for each isolate (no toxin,
 l=low, m=medium, h=high) together with the growth in mm after 8 weeks at
 temperatures 10, 17.5 and 22.5 degrees centigrade respectively. For each
 isolate the values in replicates I and II for a particular temperature are
 given.Scores-week8.xlsxSSR no missing data points- used for analysisThis excel file contains microsatellite allele sizes and mating types for each of 338 Dothistroma septosporum isolates scored at 11 microsatellite loci. The first column gives the individual isolate number, the second gives the code ascribed to each individual, and the third the code for the tree from which the isolate was derived. The fourth column gives the race to which the isolate was assigned (1 = SR, 2 = LPR, 3 = NPR). Columns 5 to 15 give the allele size for each individual at each of 11 microsatellite loci (E, F, G, I, J, K, L, M, O, DS1, DS2). Column 16 gives the mating type of the isolate (1 or 2).