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Infection and colonisation of onion seedlings by Pantoea ananatis and Pantoea allii
Dissertation (MSc (Microbiology))--University of Pretoria, 2015.
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| Format: | Thesis |
| Language: | English |
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2026
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| _version_ | 1867613545740369920 |
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| access_status_str | Open Access |
| author2 | Coutinho, Teresa A. |
| author_browse | Coutinho, Teresa A. |
| author_facet | Coutinho, Teresa A. |
| collection | Thesis |
| description | Dissertation (MSc (Microbiology))--University of Pretoria, 2015. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/110012 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:51.329Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2026 |
| publishDateRange | 2026 |
| publishDateSort | 2026 |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/110012 Infection and colonisation of onion seedlings by Pantoea ananatis and Pantoea allii Coutinho, Teresa A. vanessacronje@yahoo.com Van den Berg, N. Cronje, Vanessa Charmeine Infection Onion Microscopy Pantoe ananatis Dissertation (MSc (Microbiology))--University of Pretoria, 2015. Plant pathogenic bacteria are responsible for significant economic losses in the agricultural and forest sectors each year. They associate with their plant hosts in two ways; epiphytically, on the plant surface or endophytically, within the intercellular spaces. They gain entry to host tissue through natural openings and/or wounds. If the host defense is overcome, they rapidly multiply and colonize the tissue eventually causing a range of symptoms. Depending on the host and pathogen, these symptoms can vary from blights, wilts, tumour development to decay. This study focused on two species within the genus Pantoea, namely, P. ananatis and P. allii. Both bacteria are reported to cause central rot of onion. The symptoms associated with this disease include leaf blight which begins as water-soaked lesions that eventually coalesce leading to death of the infected leaf. The inner bulb scales may also become discoloured, although the tissue does not become macerated as is the case with bacterial soft rot caused by Pectobacterium spp. It has been hypothesised that the bacteria move down towards the bulb through the leaves. The purpose of the current study was thus to monitor the strategy used by these two bacteria to colonize the leaves of onion seedlings and bulbs using different microscopy techniques. Microbiology and Plant Pathology MSc (Microbiology) 2026-05-15T17:26:04Z 2026-05-15T17:26:04Z 16/02/12 2015 Dissertation http://hdl.handle.net/2263/110012 en application/pdf |
| spellingShingle | Infection Onion Microscopy Pantoe ananatis Infection and colonisation of onion seedlings by Pantoea ananatis and Pantoea allii |
| title | Infection and colonisation of onion seedlings by Pantoea ananatis and Pantoea allii |
| title_full | Infection and colonisation of onion seedlings by Pantoea ananatis and Pantoea allii |
| title_fullStr | Infection and colonisation of onion seedlings by Pantoea ananatis and Pantoea allii |
| title_full_unstemmed | Infection and colonisation of onion seedlings by Pantoea ananatis and Pantoea allii |
| title_short | Infection and colonisation of onion seedlings by Pantoea ananatis and Pantoea allii |
| title_sort | infection and colonisation of onion seedlings by pantoea ananatis and pantoea allii |
| topic | Infection Onion Microscopy Pantoe ananatis |
| url | http://hdl.handle.net/2263/110012 |