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Stomatal control during dessication in the resurrection plant Xerophyta humilis
Stomatal apertures on leaves of the resurrection plant Xerophyta humilis were monitored microscopically in order to characterize stomatal regulation during a dehydration time course. In addition, the effect of exogenous application of the stress hormone ABA on stomatal regulation was followed. X hum...
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| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2017
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| _version_ | 1867613222826147840 |
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| access_status_str | Open Access |
| author | Chireshe, Nyaradzo |
| author2 | Farrant, Jill M |
| author_browse | Chireshe, Nyaradzo Farrant, Jill M |
| author_facet | Farrant, Jill M Chireshe, Nyaradzo |
| author_sort | Chireshe, Nyaradzo |
| collection | Thesis |
| description | Stomatal apertures on leaves of the resurrection plant Xerophyta humilis were monitored microscopically in order to characterize stomatal regulation during a dehydration time course. In addition, the effect of exogenous application of the stress hormone ABA on stomatal regulation was followed. X humilis stomatal regulation appears to be initially similar to that typical of desiccation sensitive plants, but differed in that stomata did not all close at once but at a slower rate to control the drying rate of the plant, this gave time for protection mechanisms to be laid down. The signal hormone ABA was found to have strong stomatal control on the adaxial surfaces of leaves but weak control on the abaxial leaf surfaces, thus it is difficult to say that ABA regulates the process until RWC of below 50%, where stomatal apertures open as a result of shrinkage of guard cells due to loss of water. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/24964 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:42.829Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | Department of Biological Sciences |
| publisherStr | Department of Biological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/24964 Stomatal control during dessication in the resurrection plant Xerophyta humilis Chireshe, Nyaradzo Farrant, Jill M Botany Stomatal apertures on leaves of the resurrection plant Xerophyta humilis were monitored microscopically in order to characterize stomatal regulation during a dehydration time course. In addition, the effect of exogenous application of the stress hormone ABA on stomatal regulation was followed. X humilis stomatal regulation appears to be initially similar to that typical of desiccation sensitive plants, but differed in that stomata did not all close at once but at a slower rate to control the drying rate of the plant, this gave time for protection mechanisms to be laid down. The signal hormone ABA was found to have strong stomatal control on the adaxial surfaces of leaves but weak control on the abaxial leaf surfaces, thus it is difficult to say that ABA regulates the process until RWC of below 50%, where stomatal apertures open as a result of shrinkage of guard cells due to loss of water. 2017-08-23T13:12:21Z 2017-08-23T13:12:21Z 2007 2017-02-08T10:47:40Z Bachelor Thesis Honours BSc (Hons) http://hdl.handle.net/11427/24964 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Botany Chireshe, Nyaradzo Stomatal control during dessication in the resurrection plant Xerophyta humilis |
| thesis_degree_str | Bachelor's / Honours |
| title | Stomatal control during dessication in the resurrection plant Xerophyta humilis |
| title_full | Stomatal control during dessication in the resurrection plant Xerophyta humilis |
| title_fullStr | Stomatal control during dessication in the resurrection plant Xerophyta humilis |
| title_full_unstemmed | Stomatal control during dessication in the resurrection plant Xerophyta humilis |
| title_short | Stomatal control during dessication in the resurrection plant Xerophyta humilis |
| title_sort | stomatal control during dessication in the resurrection plant xerophyta humilis |
| topic | Botany |
| url | http://hdl.handle.net/11427/24964 |
| work_keys_str_mv | AT chireshenyaradzo stomatalcontrolduringdessicationintheresurrectionplantxerophytahumilis |