01757nas a2200205   4500008004100000245014500041210006900186300001300255490000700268520099200275653002601267653002401293653001801317653002201335100001801357700001901375700001801394700001801412856012101430       2005                        eng d00aNitrogen enrichment causes minimal changes in arbuscular mycorrhizal colonization but shifts community composition - evidence from rDNA data0 aNitrogen enrichment causes minimal changes in arbuscular mycorrh  a217 -2240 v413 aIntracellular arbuscular mycorrhizal (AM) colonization was compared between nitrogen (NH4NO3) fertilized (10 g N m−2) and nonfertilized tallgrass prairie plots. In the microscopic analyses of host roots, only intracellular coils showed an increasing trend as a result of N fertilization, whereas intracellular colonization by arbuscules, hyphae, or vesicles did not differ between the N treatments. Clone libraries established from pooled PCR products of AM fungi contained exclusively species of Glomus; no other genera were detected indicating that Glomus spp. dominated the host roots. Comparisons between observed and random topologies indicated that cloned sequence placement covaried with N treatment: unique clades within Glomus originated exclusively from N-fertilized or nonfertilized treatments. We conclude that the communities of dominant and most commonly occurring AM fungi changed in response to N amendment, although the root colonization showed minimal or no response.10aArbuscular mycorrhiza10aNitrogen deposition10aRibosomal DNA10atallgrass prairie1 aJumpponen, A.1 aTrowbridge, J.1 aMandyam, K.G.1 aJohnson, L.C.  uhttp://knz.lternet.edu/content/nitrogen-enrichment-causes-minimal-changes-arbuscular-mycorrhizal-colonization-shifts