Molecular Diversity and Morphology of Plant Associated Protists of the Atacama Desert
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| Title: | Main Title: Molecular Diversity and Morphology of Plant Associated Protists of the Atacama Desert |
| Description: | Abstract: The hyperarid Atacama Desert represents one of the most extreme biotopes on Earth. Prevailing harsh environmental conditions lead to low dispersal abilities of plants, resulting in emergence of a spontaneous spatial arrangement of endemic plant species. This supposes to affect plant associated microbial distribution simultaneously and may result in co-evolutionary patterns within geographically restricted areas and species boundaries. Recent studies in plant–microbe interactions research revealed, that plants are able to shape their associated microbial commu nity, also referred to as their “second genome”. One main part within this community of micro organisms is represented by the paraphyletic group of heterotrophic protists. Protists have short generation times, fostering mutations and thus speciation, which in turn may lead to endemism of new species due to restricted distribution abilities and adaptive radiation. The first part of this study is focused on isolation and identification of plant associated protist species within the Atacama Desert. During investigations, potential signs of endemic plant-pro tist associations could be detected, with a special attention to the ciliophoran genus Colpoda, for which seven new sequences were obtained from cultivation-based approaches of endemic plant species. Thus, same strains could not be isolated among different plant species. The results of phylogenetic analysis revealed, that the genus Colpoda proved to be paraphyletic in SSU rDNA gene sequences. In contrast, apparent cosmopolitan species could be observed, which were up to now only been known from marine environments. The second part of this investigation initially considered the rhizosphere associated protist com munities of respective plant species. The results of former studies already showed significant difficulties in obtaining microbial DNA from Atacama Desert soils, which led to the assumption, that the dry limit for microbial life may have been exceeded within the soils of the Atacama Desert. Nevertheless, the effort during this study has been worthwhile, since very first results from metagenomic analysis of protist diversity within the rhizosphere of different plant species from the Atacama Desert were revealed. The findings of this study provide an indication, that intensified research is still required to shed light on protist diversity, especially in remote areas of geographical isolation. |
Responsible Party
| Creator: | Susanne Walden (Author) |
| Publisher: | CRC1211 Database (CRC1211DB) |
| Publication Year: | 2019 |
Topic
| CRC1211 Topic: | Biology |
| Related Subproject: | B3 |
| Subject: | Keyword: Biodiversity |
| Geogr. Information Topic: | Biota |
File Details
| Filename: | WaldenMA.pdf |
| Data Type: | Text - Text |
| File Size: | 575 KB |
| Date: | Available: 24.05.2018 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Own Subproject |
| General Access and Use Conditions: | According to the CRC1211DB data policy agreement. |
| Access Limitations: | According to the CRC1211DB data policy agreement. |
| Licence: | None |
Geographic
Specific Information - Report
| Report Date: | 24th of April, 2018 |
| Report Type: | Master Thesis |
| Report City: | Cologne |
| Report Institution: | University of Cologne |
Metadata Details
| Metadata Creator: | Frank Nitsche |
| Metadata Created: | 24.10.2019 |
| Metadata Last Updated: | 24.10.2019 |
| Subproject: | B3 |
| Funding Phase: | 1 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 69 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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