Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Effect of elevated CO2 on maize susceptibility to grey leaf spot disease
Dissertation (MSc (Biotechnology))--University of Pretoria, 2023.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
University of Pretoria
2023
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613557720350720 |
|---|---|
| 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 | © 2022 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 (Biotechnology))--University of Pretoria, 2023. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/90345 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:38:02.940Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| 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:2263/90345 Effect of elevated CO2 on maize susceptibility to grey leaf spot disease Berger, David Kenneth u16019522@tuks.co.za Steyn, Martin Taylor, Nicolette Jane Scheepers, Kevin Daniel UCTD Corn Gray leaf spot Cercospora zeina Climate change Gas exchange Dissertation (MSc (Biotechnology))--University of Pretoria, 2023. Atmospheric CO2 concentrations have been rising considerably over the last century and are forecast to reach 800-1000 ppm by 2100. Maize is an important C4 crop that is cultivated around the world; however, its production is subjugated to yield losses due to Cercospora zeina-induced grey leaf spot (GLS) disease. The aim of this study was to investigate the effect of elevated [CO2] on maize susceptibility to GLS across two growing seasons. Maize plants were grown at 415 and 700 ppm CO2 in enclosed growth chambers and there was no difference in plant height-based growth rates of the B73 maize between CO2 regimes in either trial. Gas exchange parameters were assessed, and increased leaf photosynthetic rates were observed for maize grown at elevated CO2 levels in both trials, while greater stomatal conductance was measured on the high CO2-grown plants in the second trial only. Maize leaf stomatal density and in vitro C. zeina growth were shown to be unaffected by elevated [CO2], along with maize leaf sugars, such as glucose and sucrose. However, maltose concentrations were significantly greater at 415 ppm than 700 ppm CO2. Maize leaves were inoculated with C. zeina, and disease development was recorded and quantified, wherein no CO2 effect was documented in the first trial. Significantly greater GLS symptoms were observed on plants grown at elevated [CO2] than ambient in the repeat trial, although this was a consequence of limited GLS development in the ambient CO2-grown maize. Analysis of the environmental data from each chamber suggests that a chamber effect occurred in the second trial due to relatively lowered humidity in the ambient CO2 chamber during the critical period for C. zeina infection following inoculation. Therefore, the conclusion is that maize susceptibility to GLS will not be significantly affected by elevated [CO2], which demonstrates a neutral effect of climate change on one major maize disease. NRF Plant Science MSc (Biotechnology) Unrestricted 2023-04-04T09:44:14Z 2023-04-04T09:44:14Z 2023 2023 Dissertation Scheepers, KD 2023, Effect of elevated CO2 on maize susceptibility to grey leaf spot disease, MSc dissertation, University of Pretoria, Pretoria, viewed 20230330 http://hdl.handle.net/2263/90345 DOI: 10.25403/UPresearchdata.22277812.v1 https://doi.org/10.25403/UPresearchdata.22277812 en © 2022 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 Corn Gray leaf spot Cercospora zeina Climate change Gas exchange Effect of elevated CO2 on maize susceptibility to grey leaf spot disease |
| title | Effect of elevated CO2 on maize susceptibility to grey leaf spot disease |
| title_full | Effect of elevated CO2 on maize susceptibility to grey leaf spot disease |
| title_fullStr | Effect of elevated CO2 on maize susceptibility to grey leaf spot disease |
| title_full_unstemmed | Effect of elevated CO2 on maize susceptibility to grey leaf spot disease |
| title_short | Effect of elevated CO2 on maize susceptibility to grey leaf spot disease |
| title_sort | effect of elevated co2 on maize susceptibility to grey leaf spot disease |
| topic | UCTD Corn Gray leaf spot Cercospora zeina Climate change Gas exchange |
| url | http://hdl.handle.net/2263/90345 https://doi.org/10.25403/UPresearchdata.22277812 |