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- W2172233264 abstract "• We investigated the nutritional dynamics of Phaeocryptopus gaeumannii and the impact of nitrogen (N) fertilization of Douglas-fir (Pseudotsuga menziesii) on the production of P. gaeumannii fungal fruiting bodies. Emergence of P. gaeumannii fungal fruiting bodies (pseudothecia) in Douglas-fir stomata has been directly linked to premature needle loss, a symptom of Swiss needle cast disease. • Douglas-fir trees (10-yr-old) naturally infected with P. gaeumannii were treated with soil applications of N fertilizer isotopically enriched with 15N to increase foliar N and track the movement of N from the host to the fungus. Foliar N, free amino acids, percent of stomata occluded by pseudothecia, N isotope and carbon (C) isotope levels were assessed on treated and control trees. • Higher foliar N resulted in increased %N and %C in P. gaeumannii, as well as increased fungal fruiting and thus disease severity. Comparisons of δ15N levels between P. gaeumannii pseudothecia and associated needles indicated an increase in δ15N of needles and a simultaneous decline in δ15N of pseudothecia coupled with increased levels of foliar and fungal percentage N. • These findings confirm that P. gaeumannii responds to host nutrient status and that increased N availability inside Douglas-fir needles is linked to increased severity of Swiss needle cast disease." @default.
- W2172233264 created "2016-06-24" @default.
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- W2172233264 date "2004-06-09" @default.
- W2172233264 modified "2023-09-23" @default.
- W2172233264 title "Nitrogen and carbon dynamics of a foliar biotrophic fungal parasite in fertilized Douglas‐fir" @default.
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- W2172233264 doi "https://doi.org/10.1111/j.1469-8137.2004.01102.x" @default.
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