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Biochemical mechanisms for tolerance of citrus rootstocks against Phytophthora nicotianae
Dissertation (MSc (Microbiology and Plant Pathology))--University of Pretoria, 2006.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613698782134272 |
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| access_status_str | Open Access |
| author2 | Labuschagne, Nico |
| author_browse | Labuschagne, Nico |
| author_facet | Labuschagne, Nico |
| collection | Thesis |
| dc_rights_str_mv | © 2004, 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 and Plant Pathology))--University of Pretoria, 2006. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/26373 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:40:17.184Z |
| 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:2263/26373 Biochemical mechanisms for tolerance of citrus rootstocks against Phytophthora nicotianae Labuschagne, Nico Apostolides, Zeno upetd@ais.up.ac.za Fourie, Andries No keywords available UCTD Dissertation (MSc (Microbiology and Plant Pathology))--University of Pretoria, 2006. It was established that although the phytoalexin scoparone is associated with resistance/tolerance of citrus rootstocks to stem cancer caused by Phytophthora citrophthora, it does not dictate tolerance to root rot caused by P. nicotianae. It can therefore not be used as an indicator for tolerance to root rot. Results of the current study show that increase in total soluble phenolic concentrations in citrus roots after inoculation plays a key role in tolerance of citrus rootstocks against P. nicotianae root rot. Elevation of the levels of total phenolic compounds is therefore a part of the mechanism involved in rootstock resistance. As far as could be established, this finding has not been reported before in citrus. Determination of total soluble phenolics in citrus roots can therefore be used as a parameter in the screening of rootstocks for tolerance to P. nicotianae. Application of the systemic fungicide fosetyl-Al increased the total soluble phenolic concentrations in the roots more than infection with the pathogen alone. This provides evidence that the elevation of phenolic levels is involved in the mechanism of action of fosetyl-Al in control of Phytophthora root rot, therefore supporting an indirect antifungal mode of action. A unique chemical compound (U82) has been discovered that is associated only with tolerant rootstocks. If this yellow compound is a viable marker for resistance, it will certainly be a breakthrough in rootstock resistance research. Such a unique compound that is only associated with tolerant rootstocks could potentially be used in developing a more reliable high throughput screening technique for citrus rootstock resistance. Microbiology and Plant Pathology unrestricted 2013-09-07T04:53:56Z 2005-02-01 2013-09-07T04:53:56Z 2004-05-08 2006-02-01 2005-02-01 Dissertation Fourie, A 2004, Biochemical mechanisms for tolerance of citrus rootstocks against Phytophthora nicotianae, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/26373 > http://hdl.handle.net/2263/26373 http://upetd.up.ac.za/thesis/available/etd-02012005-085111/ © 2004, 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 | No keywords available UCTD Biochemical mechanisms for tolerance of citrus rootstocks against Phytophthora nicotianae |
| title | Biochemical mechanisms for tolerance of citrus rootstocks against Phytophthora nicotianae |
| title_full | Biochemical mechanisms for tolerance of citrus rootstocks against Phytophthora nicotianae |
| title_fullStr | Biochemical mechanisms for tolerance of citrus rootstocks against Phytophthora nicotianae |
| title_full_unstemmed | Biochemical mechanisms for tolerance of citrus rootstocks against Phytophthora nicotianae |
| title_short | Biochemical mechanisms for tolerance of citrus rootstocks against Phytophthora nicotianae |
| title_sort | biochemical mechanisms for tolerance of citrus rootstocks against phytophthora nicotianae |
| topic | No keywords available UCTD |
| url | http://hdl.handle.net/2263/26373 http://upetd.up.ac.za/thesis/available/etd-02012005-085111/ |