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Molecular diversity of arbuscular mycorrhizal fungi associated with two dominant xerophytes in a valley-type savanna, southwest China

Li, Tao, Li, Lingfei, Sha, Tao, Zhang, Hanbo, Zhao, Zhiwei
Applied soil ecology 2010 v.44 no.1 pp. 61-66
Heteropogon contortus, Dodonaea viscosa, xerophytes, rhizosphere, roots, Glomus, vesicular arbuscular mycorrhizae, mycorrhizal fungi, genetic variation, ribosomal RNA, nucleotide sequences, phylogeny, host plants, root systems, China
The diversity of arbuscular mycorrhizal fungi (AMF) colonizing the roots and rhizosphere soils of Heteropogon contortus and Dodonaea viscose growing in a valley-type savanna, southwest China, were analyzed by the large subunit ribosomal RNA genes (LSU). A total of 547 AMF sequences were screened for establishment of four clone libraries. Phylogenetic analysis revealed that the sequences clustered in at least 8 discrete sequence groups, all belonging to the genus Glomus. Among the Glomus spp., Glo 1 (GlGr A) and Glo 7 (GlGr B) were the most common in all root and soil samples of the two xerophytes, accounting for 42% and 33% of all screened clones, respectively. The ∫-LIBSHUFF analysis revealed that the composition of AMF communities associated with the two xerophytic hosts varied greatly both in roots and their rhizosphere soils.