Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Population genetics of the maize foliar pathogen cercospora zeina crous & U. braun in five countries of Sub-Saharan Africa
Thesis (PhD)--University of Pretoria, 2019.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
University of Pretoria
2020
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613660106457088 |
|---|---|
| access_status_str | Open Access |
| author2 | Berger, David Kenneth |
| author_browse | Berger, David Kenneth |
| author_facet | Berger, David Kenneth |
| collection | Thesis |
| dc_rights_str_mv | © 2020 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)--University of Pretoria, 2019. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/77869 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:40.578Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| 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:2263/77869 Population genetics of the maize foliar pathogen cercospora zeina crous & U. braun in five countries of Sub-Saharan Africa Berger, David Kenneth u15286152@tuks.co.za Barnes, Irene Nsibo, David Livingstone UCTD Thesis (PhD)--University of Pretoria, 2019. Cercospora zeina, a causal pathogen of gray leaf spot (GLS) of maize, is responsible for up to 1 % of global yield losses. Previous small-scale population genetics studies have revealed that C. zeina is a highly diverse pathogen. Using microsatellite markers, we set out to determine the genetic diversity and population structure of 835 C. zeina isolates from five countries in Sub-Saharan Africa: Kenya, South Africa, Uganda, Zambia, and Zimbabwe, and to establish their evolutionary potential. Our findings revealed that populations from different farming systems exhibited partial, but significant population differentiation. Also, smallholder populations had a higher genetic diversity, number of private alleles and lower clonality than commercial populations. Country-level populations were highly diverse and structured, with migration occurring among populations. Interestingly, Zambia came out as a distinct population, with a lower genetic diversity, higher clonality and private alleles, indicative of a more recently introduced population. Our findings rejected the existing hypothesis of Durban harbor being the entry point of C. zeina into Africa, thus suggesting that the pathogen has other point(s) of entry. Additionally, signatures of cryptic sexual recombination were observed even though an attempt to induce the sexual stage in laboratory conditions was unsuccessful. We found no evidence for C. zeae-maydis, C. zeina’s sibling species in more than 1000 isolates collected from around Africa, thus confirming that C. zeina is the predominant species in Africa. Overall, this pathogen is a genetically well-established pathogen in Africa with its population structure being influenced by sexual recombination, migration and human activities. This study, therefore, provides a basis for effective monitoring of C. zeina’s dispersal and is a tool for designing more effective regional-specific management strategies to reduce the acquisition and movement of highly virulent strains that overcome host resistance or fungicide control. Plant Production and Soil Science PhD Unrestricted 2020-12-29T11:51:00Z 2020-12-29T11:51:00Z 2020/04/24 2019 Thesis Nsibo, DL 2019, Population genetics of the maize foliar pathogen cercospora zeina crous & U. braun in five countries of Sub-Saharan Africa, PhD Thesis, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/77869> A2020 http://hdl.handle.net/2263/77869 en © 2020 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 | UCTD Population genetics of the maize foliar pathogen cercospora zeina crous & U. braun in five countries of Sub-Saharan Africa |
| title | Population genetics of the maize foliar pathogen cercospora zeina crous & U. braun in five countries of Sub-Saharan Africa |
| title_full | Population genetics of the maize foliar pathogen cercospora zeina crous & U. braun in five countries of Sub-Saharan Africa |
| title_fullStr | Population genetics of the maize foliar pathogen cercospora zeina crous & U. braun in five countries of Sub-Saharan Africa |
| title_full_unstemmed | Population genetics of the maize foliar pathogen cercospora zeina crous & U. braun in five countries of Sub-Saharan Africa |
| title_short | Population genetics of the maize foliar pathogen cercospora zeina crous & U. braun in five countries of Sub-Saharan Africa |
| title_sort | population genetics of the maize foliar pathogen cercospora zeina crous u braun in five countries of sub saharan africa |
| topic | UCTD |
| url | http://hdl.handle.net/2263/77869 |