Arbuscular mycorrhizae from semiarid regions of Namibia

Uhlmann, Elisabeth; Görke, Claudia; Petersen, Andreas; Oberwinkler, Franz

doi:10.1139/b04-039

Cited by 34 publications

(22 citation statements)

References 41 publications

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“…The mean spore density in our study was lower than reports from other ecosystems, like the tropical rain forest of southwest China [43,44] and semiarid regions of Nambia [45] . However, our results are similar to those from other desert ecosystems such as the Mojave [17] and Negev deserts [34] .…”

Section: Discussioncontrasting

confidence: 91%

Arbuscular mycorrhizal associations in the Gurbantunggut Desert

et al. 2006

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The plants in the Gurbantunggut Desert located in Xinjiang, China are drought adapted species and grow in generally nutrient-poor soils. A survey was conducted in the desert to determine the arbuscular mycorrhizal (AM) status associated with the desert plants which belong to 23 species from 11 families of annuals and perennials. Roots from all plants were examined for the presence of internal and external hyphae, vesicles and coils/arbuscules to determine the status and extent of mycorrhizal colonization. Of the plant species surveyed, 14 (61%) were found to form AM associations, 5 (22%) were possible AM colonized species, and 4 were non-mycorrhizal plants. The proportions of annuals and shrubs forming AM were significantly lower than those of perennials and herbs, respectively. Spore density varied from 5 to 21 per 20 g in soil of root zone. 14 AM fungal taxa in 3 genera were isolated and identified, 10 of which belonged to Glomus, 3 to Acaulospora, and 1 to Archaeospora. Glomus was the dominant genus in all genera identified. G. deserticola and G. etunicatum were the most common taxa isolated, with occurrence frequencies of 77.4% and 74.8%, and relative abundances of 14.4% and 15.5%, respectively.

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Section: Discussioncontrasting

confidence: 91%

Arbuscular mycorrhizal associations in the Gurbantunggut Desert

et al. 2006

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“…Hogberg, ; Bakarr & Janos, ). Although we do not have information on the AMF diversity associated with different plant species in the studied habitats, a higher richness of host plants should result in more diverse AMF communities because a certain host‐AMF specificity has been found in different tropical ecosystems (Uhlmann et al ., ; Wubet et al ., ; Mangan et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Arbuscular mycorrhizal fungi communities from tropical Africa reveal strong ecological structure

et al. 2016

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SummaryUnderstanding the distribution and diversity of arbuscular mycorrhizal fungi (AMF) and the rules that govern AMF assemblages has been hampered by a lack of data from natural ecosystems. In addition, the current knowledge on AMF diversity is biased towards temperate ecosystems, whereas little is known about other habitats such as dry tropical ecosystems.We explored the diversity and structure of AMF communities in grasslands, savannas, dry forests and miombo in a protected area under dry tropical climate (Gorongosa National Park, Mozambique) using 454 pyrosequencing.In total, 147 AMF virtual taxa (VT) were detected, including 22 VT new to science. We found a high turnover of AMF with ˂ 12% of VT present in all vegetation types. Forested areas supported more diverse AMF communities than savannas and grassland. Miombo woodlands had the highest AMF richness, number of novel VT, and number of exclusive and indicator taxa.Our data reveal a sharp differentiation of AMF communities between forested areas and periodically flooded savannas and grasslands. This marked ecological structure of AMF communities provides the first comprehensive landscape-scale evidence that, at the background of globally low endemism of AMF, local communities are shaped by regional processes including environmental filtering by edaphic properties and natural disturbance.

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“…Based on spore morphology, 41 AMF species and 5 morphotypes were identified (Table 4). Similarly, 44 and 60 AM fungal species were detected from semiarid grasslands of Namibia (Uhlmann et al, 2004) and sub-Saharan Savannas of Benin, West Africa (Tchabi et al, 2008), respectively. Likewise, 43 species of AMF were isolated from Western Brazilian Amazon (Stürmer and Siqueira, 2011).…”

Section: Discussionmentioning

confidence: 89%

Diversity and abundance of arbuscular mycorrhizal fungi associated with acacia trees from different land use systems in Ethiopia

Belay¹,

Vestberg²,

Assefa³

2013

Afr. J. Microbiol. Res.

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Root samples and rhizosphere soil of nine acacia species (Acacia abyssinica, Faidherbia albida, A. nilotica, A. senegal, A. seyal, A. sieberiana, A. saligna, A. tortilis and A. robusta) were collected from Bishoftu, Zeway and Addis Ababa sites with different land use types to assess their Arbuscular Mycorrhizal Fungal (AMF) diversity, spore density and root colonization. The percentage of root length colonized by AMF was estimated. Spores, spore clusters and sporocarps extracted from soil samples were counted and morphologically identified to species or specific morphotype. Roots of all acacia species were colonized from low to moderate or relatively high levels by AMF with the occurrence of arbuscules, vesicles and hyphae. Arbuscules were however not detected in roots of A. senegal. The highest AM fungal colonization was found in A. seyal (67.3%) from open grazing field (OGF) at Zeway followed by A. nilotica (44%), whereas the lowest AMF colonization of 12% was recorded in A. saligna at Bishoftu. Rhizosphere soils harbored AMF fungal spores ranging from 3.7 spores g -1 soil in A. nilotica to 15.0 spores g -1 in A. seyal from open grazing field (OGF) at Zeway. A total of 41 AMF species in 14 genera and 7 families of the Glomeromycota were identified. Nine species belonged to Acaulospora, 6 to Funneliformis, 4 each to Gigaspora, Glomus, and Rhizophagus, 3 each to Claroideoglomus, and Scutellospora, 2 each to Racocetra and Diversispora, and 1 each to Entrophospora, Sclerocystis, Paraglomus and Pacispora. Moreover, 2 unidentified morphotypes each of Glomus, and Acaulospora and 1 of Archaeospora were isolated. Based on relative abundance and isolation frequency of spores, C. claroideum, C. etunicatum, C. luteum, F. geosporus and G. aggregatum were the dominant species in the study. The study showed that the acacia species were characterized by relatively high AMF colonization and very high AMF diversity. AMF spore density and AM root colonization in acacia roots were influenced by soil factors such as available P and soil texture.

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Arbuscular mycorrhizae from semiarid regions of Namibia

Cited by 34 publications

References 41 publications

Arbuscular mycorrhizal associations in the Gurbantunggut Desert

Arbuscular mycorrhizal associations in the Gurbantunggut Desert

Arbuscular mycorrhizal fungi communities from tropical Africa reveal strong ecological structure

Diversity and abundance of arbuscular mycorrhizal fungi associated with acacia trees from different land use systems in Ethiopia

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