Factors affecting the local distribution of Polystigma rubrum stromata on Prunus spinosa
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Supplementary Files

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Keywords

Ascomycete taxonomy
endophyte
fungal conservation
leaf pathogen
Xylariales
biotrophs
Polystigma rubrum

How to Cite

Roberts, H., Pidcock, S., Redhead, S., Richards, E., O’Shaughnessy, K., Douglas, B. and Griffith, G. (2018) “Factors affecting the local distribution of Polystigma rubrum stromata on Prunus spinosa”, Plant Ecology and Evolution, 151(2), pp. 278-283. doi: 10.5091/plecevo.2018.1442.

Abstract

Background and aimsPolystigma rubrum forms orange-red stromata on the surface of living leaves of Prunus spinosa and P. domestica. Records suggests that this fungus now has a much more limited distribution in Britain than recorded in the 19th and early 20th century.
Methods – We studied the local distribution of the fungus in the Burren Hills of western Ireland where it remains very common.
Key results – Assessment of the local distribution of the fungus over two years found stromata to occur more frequently on P. spinosa leaves in hedgerows than woodlands. On individual trees in areas of open limestone pavement, the frequency of stromata was ten times higher in 2016 than 2015, possibly related to interannual rainfall differences. On hedgerow trees subjected to winter flooding, stromata were much less abundant, whereas stromata were more abundant on leaves also infected by the gall mite Eriophyes prunispinosae. The identity of Po. rubrum was confirmed by ITS sequencing.
Conclusion – At a field location where Po. rubrum stromata are present in unusually high abundance, the distribution of stromata on trees in different habitats showed high levels of variation linked to both habitat and the presence of gall mites. Further work is required to determine whether variation in leaf surface and soil moisture are the key determinants of the observed distribution. Such investigations may reveal why Po. rubrum, once common in northern Europe is now restricted mainly to westerly, coastal locations.

https://doi.org/10.5091/plecevo.2018.1442
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