Variation in rDNA ITS sequences in Glomus mosseae and Gigaspora margarita spores from a permanent pasture

Antoniolli, Z. I.; Schachtman, Daniel P.; Ophel-Keller, K.; Smith, Sally E.

doi:10.1017/s0953756299001860

Cited by 50 publications

(35 citation statements)

References 29 publications

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“…A possible explanation for the fungal OTU number detected by ARISA technique is the higher variation in the 18S-28S rRNA intergenic spacer region in eukaryotes [32] which must have led to this apparent higher diversity of the fungi. Archaeal and bacterial OTU richness detected by ARISA were higher in soil samples collected in January 2009, whereas, for fungi, it was higher in the soil samples collected in March 2008.…”

Section: Model I Of Amazonian Agricultural System: the "Slash-and-burmentioning

confidence: 99%

A Molecular Survey of the Diversity of Microbial Communities in Different Amazonian Agricultural Model Systems

et al. 2010

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Abstract:The processes of land conversion and agricultural intensification are a significant cause of biodiversity loss, with consequent negative effects both on the environment and the sustainability of food production. The anthrosols associated with pre-Colombian settlements in the Amazonian region are examples of how anthropogenic activities may sustain the native populations against harsh tropical environments for human establishment, even without a previous intentionality of anthropic soil formation. In a case study (Model I-"Slash-andBurn") the community structures detected by automated ribosomal intergenic spacer analysis (ARISA) revealed that soil archaeal, bacterial and fungal communities are heterogeneous and each capable of responding differently to environmental characteristics. ARISA data evidenced considerable difference in structure existing between microbial communities in forest and agricultural soils. In a second study (Model II-"Anthropogenic Soil"), the bacterial community structures revealed by terminal restriction fragment length polymorphism (T-RFLP) differed among an Amazonian Dark Earth (ADE), black carbon (BC) and its adjacent non-anthropogenic oxisoil. The bacterial 16S rRNA gene (OTU) richness estimated by pyrosequencing was higher in ADE than BC. The most abundant bacterial phyla in ADE soils and BC were Proteobacteria-24% ADE, 15% BC; Acidobacteria-10% ADE, 21% BC; Actinobacteria-7% ADE, 12% BC; Verrucomicrobia, 8% ADE; 9% BC; Firmicutes-3% ADE, 8% BC. Overall, unclassified bacteria corresponded to 36% ADE, and 26% BC. Regardless of current land uses, our data suggest OPEN ACCESSDiversity 2010, 2 788 that soil microbial community structures may be strongly influenced by the historical soil management and that anthrosols in Amazonia, of anthropogenic origins, in addition to their capacity of enhancing crop yields, may also improve microbial diversity, with the support of the black carbon, which may sustain a particular and unique habitat for the microbes.

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Section: Model I Of Amazonian Agricultural System: the "Slash-and-burmentioning

confidence: 99%

A Molecular Survey of the Diversity of Microbial Communities in Different Amazonian Agricultural Model Systems

et al. 2010

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“…Based on the lack of sexual reproduction in AMF, it has been suggested that applying the species concept could be difficult and that it would be more appropriate to base the description of biodiversity on genetic diversity (Sanders et al 1996). However, even for interpretation of the most recent molecular ecological studies, genetic variation within one population and among different isolates of one species can be quite high (Antoniolli et al 2000;Clapp et al 2001;Redecker et al 2003). Morphospecies are units of classical taxonomy and units of experimental manipulation when linking organismal and molecular scales.…”

Section: Species Richness and Community Diversity Across Chinamentioning

confidence: 99%

Twenty years of research on community composition and species distribution of arbuscular mycorrhizal fungi in China: a review

et al. 2006

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The biodiversity and distribution of arbuscular mycorrhizal fungi (AMF) in different ecosystems and plant communities in China has received increasing interest over the past decades. This has led to a steady increase in the number of scientific papers published on this topic. Studies have surveyed AMF-colonizing rhizospheres of most families of angiosperms, bryophytes, pteridophytes, and gymnosperms. China has about 30,000 plant species (one eighth of the plant species worldwide). A total of 104 AMF species within nine genera, including 12 new species, have been reported in environments such as croplands, grasslands, forests, and numerous disturbed environments. In this paper, we review data published over the past 20 years on AMF community composition and species distribution, the mycorrhizal status of plants, AMF spore communities in different habitats, and germplasm collections in China. Possible future trends in the study of the biodiversity of AMF are also briefly discussed. In particular, the aim of our review is to make some of the recent work published in the Chinese literature accessible to a wider international audience.

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“…The regions used in this study -the nuclear rDNA spacer (ITS) and the mtDNA SSU rDNA, thus showed different resolutions, with only the nuclear rDNA ITS region able to distinguish the SDS pathogen from the remaining taxa. Despite the high evolution rate of the mtDNA, the ribosomal small subunit encompasses only one conserved gene, in contrast to the nuclear rDNA region which, with noncoding spacer regions, is considered to be more variable (Moricca & Ragazzi, 1998;Antoniolli et al, 2000).…”

Section: Ppa_1116mentioning

confidence: 99%

Morphological and molecular characterization of the sudden‐death syndrome pathogen of soybean in Brazil

et al. 2005

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Brazilian Fusarium isolates causing soybean sudden death syndrome (SDS) were characterized by comparing them with other Fusarium isolates associated with soybean root rot, as well as F. solani f.sp. glycines isolates associated with the disease in the USA, using molecular (mitochondrial and nuclear rDNA), morphological, cultural and pathogenic characteristics. On the basis of pathogenicity data, and restriction fragment length polymorphism and sequence analysis of the rDNA internal transcribed spacer (ITS) regions, isolates formed a group distinct from nonSDS F. solani isolates, as well as other Fusarium species. ITS sequence analysis also revealed that Brazilian isolates were distinct from the majority of SDS pathogens from the USA ( Fusarium virguliforme ) and conformed to Fusarium tucumaniae .

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Variation in rDNA ITS sequences in Glomus mosseae and Gigaspora margarita spores from a permanent pasture

Cited by 50 publications

References 29 publications

A Molecular Survey of the Diversity of Microbial Communities in Different Amazonian Agricultural Model Systems

A Molecular Survey of the Diversity of Microbial Communities in Different Amazonian Agricultural Model Systems

Twenty years of research on community composition and species distribution of arbuscular mycorrhizal fungi in China: a review

Morphological and molecular characterization of the sudden‐death syndrome pathogen of soybean in Brazil

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