Competition, facilitation, and niche differentiation in two foliar pathogens

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Author Al-Naimi, F.A. en_US
Author Garrett, K.A. en_US
Author Bockus, William W. en_US
Available date 2009-12-29T08:35:51Z en_US
Publication Date 2004-12-15 en_US
Publication Name Oecologia
Citation Al-Naimi, F. A., Garrett, K. A., & Bockus, W. W. (2005). Competition, facilitation, and niche differentiation in two foliar pathogens. Oecologia, 143(3), 449–457 en_US
ISSN 0029-8549 (Print) en_US
ISSN 1432-1939 (Online) en_US
URI 10.1007/s00442-004-1814-x en_US
Abstract We 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. en_US
Language en en_US
Publisher Springer Berlin / Heidelberg en_US
Subject Facultative saprophytes en_US
Subject Impact niche en_US
Subject Obligate parasites en_US
Subject Requirement niche en_US
Subject Rust fungi en_US
Title Competition, facilitation, and niche differentiation in two foliar pathogens en_US
Type Article en_US

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