Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
The effect of smoke teatment on the germination on four species of Mesembryanthemum: some preliminary observations
The effect of plant derived smoke on germination, extent of eosine dye penetration and amount of abscisic acid (ABA) in the seeds of two Karoo non-fire-prone species: Ruschia caroli and Drosanthemum speciosum, and two fynbos fire-prone species: R. macowanii and D. stokoei, of Mesembryanthemum were i...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Biological Sciences
2020
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613315921870848 |
|---|---|
| access_status_str | Open Access |
| author | Janse van Rensburg, Sue |
| author2 | Farrant, J M |
| author_browse | Farrant, J M Janse van Rensburg, Sue |
| author_facet | Farrant, J M Janse van Rensburg, Sue |
| author_sort | Janse van Rensburg, Sue |
| collection | Thesis |
| description | The effect of plant derived smoke on germination, extent of eosine dye penetration and amount of abscisic acid (ABA) in the seeds of two Karoo non-fire-prone species: Ruschia caroli and Drosanthemum speciosum, and two fynbos fire-prone species: R. macowanii and D. stokoei, of Mesembryanthemum were investigated. The seed coat characteristics of each species were also investigated. Pierce et al. (1995) found that smoke promotes seed germination in the Karoo species R. caroli (scarified) and D. speciosum, whereas smoke has no effect on the germination of R. macowanii and D. stokoei (fynboss species). Results presented in this investigation support those of Pierce et al. (1995). The extent of dye penetration in smoke treated seeds if D. speciosum was significantly greater then that in untreated seeds of this species. This was due to the breakdown of some barrier, apparently in the membrane between the endosperm and the seed coat, by smoke. Seed ABA levels were reduced by smoke treatment in all four species, however this reduction was more pronounced in the smoke responsive species. Seeds coat studies revealed that the least responsive species was the only one to be covered by a waxy cuticle. Seed dormancy was a feature of the species in which seed was improved by germination, whereas the seeds of the unresponsive species, R. macowanii and D. stokoei were non-dormant. Hence, smoke appears to act as a dormancy release cue, having no, or little effect, on the seed germination of non-dormant species. Results from this study indicate that the mechanism of smoke triggered dormancy release involves the chemical alteration of the membrane bounding the endosperm and the reduction in the ABA concentration in the species investigated. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/32419 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:10.861Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| 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:11427/32419 The effect of smoke teatment on the germination on four species of Mesembryanthemum: some preliminary observations Janse van Rensburg, Sue Farrant, J M Mesembryanthemum The effect of plant derived smoke on germination, extent of eosine dye penetration and amount of abscisic acid (ABA) in the seeds of two Karoo non-fire-prone species: Ruschia caroli and Drosanthemum speciosum, and two fynbos fire-prone species: R. macowanii and D. stokoei, of Mesembryanthemum were investigated. The seed coat characteristics of each species were also investigated. Pierce et al. (1995) found that smoke promotes seed germination in the Karoo species R. caroli (scarified) and D. speciosum, whereas smoke has no effect on the germination of R. macowanii and D. stokoei (fynboss species). Results presented in this investigation support those of Pierce et al. (1995). The extent of dye penetration in smoke treated seeds if D. speciosum was significantly greater then that in untreated seeds of this species. This was due to the breakdown of some barrier, apparently in the membrane between the endosperm and the seed coat, by smoke. Seed ABA levels were reduced by smoke treatment in all four species, however this reduction was more pronounced in the smoke responsive species. Seeds coat studies revealed that the least responsive species was the only one to be covered by a waxy cuticle. Seed dormancy was a feature of the species in which seed was improved by germination, whereas the seeds of the unresponsive species, R. macowanii and D. stokoei were non-dormant. Hence, smoke appears to act as a dormancy release cue, having no, or little effect, on the seed germination of non-dormant species. Results from this study indicate that the mechanism of smoke triggered dormancy release involves the chemical alteration of the membrane bounding the endosperm and the reduction in the ABA concentration in the species investigated. 2020-12-01T07:15:54Z 2020-12-01T07:15:54Z 1995 2020-12-01T07:14:53Z Bachelor Thesis Honours BSc (Hons) http://hdl.handle.net/11427/32419 eng application/pdf Department of Biological Sciences Faculty of Science |
| spellingShingle | Mesembryanthemum Janse van Rensburg, Sue The effect of smoke teatment on the germination on four species of Mesembryanthemum: some preliminary observations |
| thesis_degree_str | Bachelor's / Honours |
| title | The effect of smoke teatment on the germination on four species of Mesembryanthemum: some preliminary observations |
| title_full | The effect of smoke teatment on the germination on four species of Mesembryanthemum: some preliminary observations |
| title_fullStr | The effect of smoke teatment on the germination on four species of Mesembryanthemum: some preliminary observations |
| title_full_unstemmed | The effect of smoke teatment on the germination on four species of Mesembryanthemum: some preliminary observations |
| title_short | The effect of smoke teatment on the germination on four species of Mesembryanthemum: some preliminary observations |
| title_sort | effect of smoke teatment on the germination on four species of mesembryanthemum some preliminary observations |
| topic | Mesembryanthemum |
| url | http://hdl.handle.net/11427/32419 |
| work_keys_str_mv | AT jansevanrensburgsue theeffectofsmoketeatmentonthegerminationonfourspeciesofmesembryanthemumsomepreliminaryobservations AT jansevanrensburgsue effectofsmoketeatmentonthegerminationonfourspeciesofmesembryanthemumsomepreliminaryobservations |