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Epiphytic and endophytic members of the Enterobacteriaceae associated with healthy Eucalyptus trees
Dissertation (MSc (Microbiology))--University of Pretoria, 2009.
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University of Pretoria
2013
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| _version_ | 1867613632763789312 |
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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 |
| dc_rights_str_mv | © 2006 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc (Microbiology))--University of Pretoria, 2009. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/26148 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:39:14.512Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/26148 Epiphytic and endophytic members of the Enterobacteriaceae associated with healthy Eucalyptus trees Coutinho, Teresa A. upetd@up.ac.za Venter, S.N. (Stephanus Nicolaas) Makhado, Ndivhuho Agnes Healthy eucalyptus trees Enterobacteriaceae UCTD Dissertation (MSc (Microbiology))--University of Pretoria, 2009. Studies presented in this thesis, highlights the importance of determining whether members of the Enterobacteriaceae can be associated with plants as epi- and endophytes. In particular, whether the causal agent of blight and die-back of Eucalyptus can survive both epi- and endophytically onlin its host as well as in weeds grown in close proximity to these hosts. This knowledge allows one a better understanding of the etiology and epidemiology of this disease. Appropriate management strategies can now be provided and the impact of the disease lessened in the nursery environment Chapter One presents an evaluation of the potential importance of Enterobacteriaceae as epi- and endophytes on/in plants. Some information is known about the epi- and endophytes associated with economically important agricultural crops. This information is largely lacking for tree species, especially those grown for commercial forestry purposes. Many Enterobacteriaceae occur both epi- and endophytically onlin plants including Pantoea ananatis. This pathogen is known to occur epiphytically on weeds as well as on its hosts where under ideal environmental conditions it is capable of causing disease symptoms. As an endophyte, P. ananatis occurs in dune grass where it fixes nitrogen and in sweet potato where it is believed to protect the plant against fungal pathogens. Chapter Two analyses healthy leaves, both young and mature, removed from various clones of the hydrid, E. grandis x E. nitens, for the presence of bacterial epi- and endophytes. Enterobacteriaceae were also isolated and these included Pantoea spp. and Enterobacter spp. P. ananatis was isolated both epi- and endophytically onlin healthy Eucalyptus tissue as well as from leaves removed from weeds growing in close proximity to the diseased plants. This thesis clearly indicates that P. ananatis can occur both epi- and endophytically in healthy Eucalyptus tissue. The movement of planting material into new environments where bacterial blight and die-back does not occur should be restricted. Irrigation practices in nurseries should be reviewed to prevent the accumulation of water on the plant surface which will allow for entry of the pathogen into the host through natural openings. Another management strategy that must also be recommended is that stringent weed control be implemented in the nursery environment. Microbiology and Plant Pathology unrestricted 2013-09-07T02:51:40Z 2008-08-13 2013-09-07T02:51:40Z 2007-04-20 2009-08-13 2008-07-09 Dissertation Makhado, NA 2006, Epiphytic and endophytic members of the Enterobacteriaceae associated with healthy Eucalyptus trees, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/26148 > E556/ag http://hdl.handle.net/2263/26148 http://upetd.up.ac.za/thesis/available/etd-07092008-102232/ © 2006 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Healthy eucalyptus trees Enterobacteriaceae UCTD Epiphytic and endophytic members of the Enterobacteriaceae associated with healthy Eucalyptus trees |
| title | Epiphytic and endophytic members of the Enterobacteriaceae associated with healthy Eucalyptus trees |
| title_full | Epiphytic and endophytic members of the Enterobacteriaceae associated with healthy Eucalyptus trees |
| title_fullStr | Epiphytic and endophytic members of the Enterobacteriaceae associated with healthy Eucalyptus trees |
| title_full_unstemmed | Epiphytic and endophytic members of the Enterobacteriaceae associated with healthy Eucalyptus trees |
| title_short | Epiphytic and endophytic members of the Enterobacteriaceae associated with healthy Eucalyptus trees |
| title_sort | epiphytic and endophytic members of the enterobacteriaceae associated with healthy eucalyptus trees |
| topic | Healthy eucalyptus trees Enterobacteriaceae UCTD |
| url | http://hdl.handle.net/2263/26148 http://upetd.up.ac.za/thesis/available/etd-07092008-102232/ |