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 cytokinin and gibberellin on potato tuber dormancy
Dissertation (MSc(Agric))--University of Pretoria, 2008.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Published: |
University of Pretoria
2013
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613469969219584 |
|---|---|
| access_status_str | Open Access |
| author2 | Hammes, Pieter Snyman, 1941- |
| author_browse | Hammes, Pieter Snyman, 1941- |
| author_facet | Hammes, Pieter Snyman, 1941- |
| collection | Thesis |
| dc_rights_str_mv | © University of Pretoria 2008 E1019 |
| description | Dissertation (MSc(Agric))--University of Pretoria, 2008. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/26858 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:39.169Z |
| 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:2263/26858 Effect of cytokinin and gibberellin on potato tuber dormancy Hammes, Pieter Snyman, 1941- riaan.rossouw@monsato.co Rossouw, Jan Adriaan Growth rate Plasmodesmata Sprout growth Cell cycle Gibberellin Cytokinin Solanum tuberosum UCTD Dissertation (MSc(Agric))--University of Pretoria, 2008. The effect of cytokinin and gibberellin, and in particular a combination of the two, on termination of dormant potato tubers was investigated. The objective was to effectively terminate dormancy through the external application of a combination of cytokinin and gibberellin. Freshly harvested tubers were treated and either cut at the stolon end with the apical portions placed on moist cotton wool, or left intact and dry. Tuber segments treated with a high concentration of cytokinin (0.1g.Lˉ¹) or a combination of cytokinin and gibberellin sprouted within 5 days, whereas high gibberellin concentrations (0.1g.Lˉ¹) stimulated sprouting within 9 days. Untreated tuber segments supplied only with moisture terminated dormancy later than hormonal treated tubers, but much earlier than segments that were kept dry. Tuber segments treated with a combination of cytokinin and gibberellin, or a high concentration of gibberellin (0.1g.Lˉ¹), produced more and longer sprouts than tubers treated with only cytokinin (0.1g.Lˉ¹) or a low concentration of gibberellin (0.005g.Lˉ¹). Sprouts on tuber segments treated with a combination of cytokinin and gibberellin attained maximum sprout growth rate nine days after treatment, but thereafter the growth rate decreased. This decrease may be a consequence of closed plasmodesmata although membrane permeability and its affect on assimilate availability may play a role. This phenomenon deserves further research attention. Removal of wound periderm did not reactivate sprout growth. The wounding of tubers by removing a portion at the stolon end and supplying moisture greatly enhanced the termination of dormancy and subsequent sprout growth, indicating that the availability of water may be a factor in initiation of sprouts. The results are compatible with the hypothesis that cells in dormant buds are arrested in the G1 phase of the cell cycle. Cytokinin is needed to initiate cell cycling, but gibberellin is also needed to initiate and maintain cell growth. These two growth regulators are also involved in the opening of the plasmodesmata as well as the creation of new plasmodesmata witch would establish communication between the apical meristem and the rest of the tuber. Plant Production and Soil Science unrestricted 2013-09-07T08:23:14Z 2008-08-08 2013-09-07T08:23:14Z 2008-04-15 2008-08-08 2008-07-30 Dissertation a 2008 E1019 gm http://hdl.handle.net/2263/26858 http://upetd.up.ac.za/thesis/available/etd-07302008-164519/ © University of Pretoria 2008 E1019 application/pdf University of Pretoria |
| spellingShingle | Growth rate Plasmodesmata Sprout growth Cell cycle Gibberellin Cytokinin Solanum tuberosum UCTD Effect of cytokinin and gibberellin on potato tuber dormancy |
| title | Effect of cytokinin and gibberellin on potato tuber dormancy |
| title_full | Effect of cytokinin and gibberellin on potato tuber dormancy |
| title_fullStr | Effect of cytokinin and gibberellin on potato tuber dormancy |
| title_full_unstemmed | Effect of cytokinin and gibberellin on potato tuber dormancy |
| title_short | Effect of cytokinin and gibberellin on potato tuber dormancy |
| title_sort | effect of cytokinin and gibberellin on potato tuber dormancy |
| topic | Growth rate Plasmodesmata Sprout growth Cell cycle Gibberellin Cytokinin Solanum tuberosum UCTD |
| url | http://hdl.handle.net/2263/26858 http://upetd.up.ac.za/thesis/available/etd-07302008-164519/ |