Competition, facilitation, and niche differentiation in two foliar pathogens
Competition, facilitation, and niche differentiation in two foliar pathogens
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DOI：
10.1007/s00442-004-1814-x
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发表时间：
2005-04-01
期刊：
影响因子：
2.7
通讯作者：
Bockus, WW
中科院分区：
文献类型：
--
作者：
Al-Naimi, FA;Garrett, KA;Bockus, WW
我们研究了专性生物营养菌小麦锈菌（此处称为锈菌）和兼性腐生菌小麦锈菌（此处称为Pyrenophora）在三种寄主基因型中的竞争，这些寄主基因型被选择为仅对锈菌抗性，仅对Pyrenophora抗性，或两者都不抗性。年龄相关的耐药性对这两种病原体都很重要。兼性腐生菌Pyrenophora通常是比生物营养型Puccinia更强的竞争对手，甚至在Pyrenophora具有早接种优势的情况下，由于Puccinia的存在而受到促进。两种病原菌在竞争种之前引入时产生的孢子最多，同时引入时比在竞争种之后引入时产生的孢子更多。在产孢率较高的环境中，契契菌的作用前生态位大于作用后生态位，其产孢量明显减少。相互作用前的生态位与相互作用后的生态位相似，而且由于相互作用前生态位的种间竞争，相互作用前的孢子减少比例较低。
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.