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Interaction between Colletotrichum dematium and cowpea
Thesis (PhD (Botany))--University of Pretoria, 2003.
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University of Pretoria
2013
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| _version_ | 1867613679389769729 |
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| access_status_str | Open Access |
| author2 | Aveling, Terry A.S. |
| author_browse | Aveling, Terry A.S. |
| author_facet | Aveling, Terry A.S. |
| collection | Thesis |
| dc_rights_str_mv | © 2003, 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 | Thesis (PhD (Botany))--University of Pretoria, 2003. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/27686 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:39:58.958Z |
| 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:2263/27686 Interaction between Colletotrichum dematium and cowpea Aveling, Terry A.S. upetd@up.ac.za Coutinho, Teresa A. Pakela, Yolisa Patronella Fungal diseases of plants Cowpea diseases and pests Collectotrichum UCTD Thesis (PhD (Botany))--University of Pretoria, 2003. Anthracnose of cowpea (Vigna unguiculata (L.) Walp) caused by Colletotrichum dematium (Pers. ex Fr) Grove has serious socio-economic implications. Subsistence farmers rely heavily on cowpea for protein and fodder; therefore, C. dematium poses a threat to production of this crop. The purpose of this study was to investigate the interaction between cowpea and C. dematium. Investigations involved characterising C. dematium field isolates using morphological and molecular techniques, infection studies, biochemical and histochemical analysis and determining factors that influence the severity of the fungus on the host. Random amplified microsatellite profiles of C. dematium grouped the isolates into eleven groups linked to morphological characteristics, pathogenicity and geographic origin. Infection studies indicated that C. dematium is a subcuticular intramural coloniser, that switches to destructive necrotrophy. Pulvinate acervuli were produced at 72 hours post inoculation over water-soaked lesions and complete necrosis of the host tissue occurred at 120 hours. The infection process was favoured by prolonged periods of high humidity and high temperatures, especially in cowpea plants between the ages six to nine-weeks-old. Investigations on the location and patterns of polyphenols in the cowpea seed coats indicated that brown coloured cowpea cultivars contained more soluble phenolic compounds than cream coloured cultivars and they were more resistant to C. dematium. Plant Science unrestricted 2013-09-07T12:03:58Z 2005-09-05 2013-09-07T12:03:58Z 2003-04-12 2003 2005-09-02 Thesis Pakela, YP 2003, Interaction between Colletotrichum dematium and cowpea, PhD thesis, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/27686 > H535/ag http://hdl.handle.net/2263/27686 http://upetd.up.ac.za/thesis/available/etd-09022005-102127/ © 2003, 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 application/pdf application/pdf University of Pretoria |
| spellingShingle | Fungal diseases of plants Cowpea diseases and pests Collectotrichum UCTD Interaction between Colletotrichum dematium and cowpea |
| title | Interaction between Colletotrichum dematium and cowpea |
| title_full | Interaction between Colletotrichum dematium and cowpea |
| title_fullStr | Interaction between Colletotrichum dematium and cowpea |
| title_full_unstemmed | Interaction between Colletotrichum dematium and cowpea |
| title_short | Interaction between Colletotrichum dematium and cowpea |
| title_sort | interaction between colletotrichum dematium and cowpea |
| topic | Fungal diseases of plants Cowpea diseases and pests Collectotrichum UCTD |
| url | http://hdl.handle.net/2263/27686 http://upetd.up.ac.za/thesis/available/etd-09022005-102127/ |