Rocky Mountain Research Station Publications
RMRS Online Publication - Journal
Articles, External Publications, and Special Reports
A mutualistic interaction between a fungivorous nematode and a fungus within the endophytic community of Bromus tectorum
Baynes, Melissa A.; Russell, Danelle M.; Newcombe, George; Carta, Lynn K.; Rossman, Amy Y.; Ismaiel, Adnan. 2012. A mutualistic interaction between a fungivorous nematode and a fungus within the endophytic community of Bromus tectorum. Fungal Ecology. 5: 610-623.
In its invaded range in western North America, Bromus tectorum (cheatgrass) can host more than 100 sequence-based, operational taxonomic units of endophytic fungi, of which an individual plant hosts a subset. Research suggests that the specific subset is determined by plant genotype, environment, dispersal of locally available endophytes, and mycorrhizal associates. But, interactions among members of the endophyte community could also be important. In a sampling of 63 sites throughout the invaded range of B. tectorum, a fungivorous nematode, Paraphelenchus acontioides, and an endophyte, Fusarium cf. torulosum, were found together in two sites. This positive co-occurrence in the field led to an experimental investigation of their interaction and its effects on relative abundances within the endophyte community. In greenhouse and laboratory experiments, we determined first that P. acontioides preferred F. cf. torulosum to other endophytes, and secondly that the relative abundance of F. cf. torulosum within the endophyte community was increased by the nematode in experimental plants. Taken together our results suggest that the fungivorous P. acontioides uses living plants to cultivate or increase the relative abundance of its preferred fungus. Surprisingly, host plant growth was unaffected by this endophytic, cultivation-based mutualism between a nematode and a fungus.
Keywords: cheatgrass, Curvularia inaequalis, fungi, Fusarium cf. torulosum, invasive species, Paraphelenchus acontioides, Penicillium olsonii, preference, suitability
About PDFs: For best results, do not open the PDF in your Web browser. Right-click on the PDF link to download the PDF file directly to your computer. Click here for more PDF help.
PDF File Size: 510 K
Title: RMRS Other
Publications: A mutualistic interaction between a fungivorous
nematode and a fungus within the endophytic community of Bromus
Electronic Publish Date: September 12, 2012
Last Update: September 12, 2012
RMRS Publications | Order a publication | Contact Us