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

Author:
Li, Tao, Li, Lingfei, Sha, Tao, Zhang, Hanbo, Zhao, Zhiwei
Source:
Applied soil ecology 2010 v.44 no.1 pp. 61-66
ISSN:
0929-1393
Subject:
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
Abstract:
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.
Agid:
772699