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AuthorAl-Naimi, F.A.
AuthorGarrett, K.A.
AuthorBockus, William W.
Available date2009-12-29T08:35:51Z
Publication Date2004-12-15
Publication NameOecologia
CitationAl-Naimi, F. A., Garrett, K. A., & Bockus, W. W. (2005). Competition, facilitation, and niche differentiation in two foliar pathogens. Oecologia, 143(3), 449–457
ISSN0029-8549 (Print)
ISSN1432-1939 (Online)
URI 10.1007/s00442-004-1814-x
AbstractWe studied competition between the obligate biotroph Puccinia triticina (designated here as Puccinia) and the facultative saprophyte Pyrenophora tritici-repentis (designated here as Pyrenophora) in older and younger leaves in a set of three host genotypes selected to be resistant to Puccinia only, Pyrenophora only, or neither. Age-related resistance is important for both of these pathogens. The facultative saprophyte Pyrenophora was generally a stronger competitor than the biotrophic Puccinia, even experiencing facilitation from the presence of Puccinia when Pyrenophora had the advantage of earlier inoculation. Both pathogen species produced the most spores when they were introduced before the competing species and more spores when introduced simultaneously compared to after the competitor. The pre-interactive niche of Puccinia was larger than the post-interactive niche and sporulation by Puccinia was substantially reduced in environments in which Pyrenophora had high sporulation rates. The pre-interactive niche of Pyrenophora was similar to the post-interactive niche and Pyrenophora had proportionally lower reductions in sporulation due to interspecific competition in the pre-interactive niche.
PublisherSpringer Berlin / Heidelberg
SubjectFacultative saprophytes
SubjectImpact niche
SubjectObligate parasites
SubjectRequirement niche
SubjectRust fungi
TitleCompetition, facilitation, and niche differentiation in two foliar pathogens

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