Changes in hormone concentrations during dormancy release of oil palm (Elaeis guineensis) seeds
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| Nhiều tác giả: | , , , , |
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| Định dạng: | artículo original |
| Ngày xuất bản: | 2008 |
| Miêu tả: | Oil palm (Elaeis guineensis) seeds are highly dormant immediately after harvest. In practical horticulture this dormancy has been traditionally overcome by a dry-heat treatment and, more recently, through the application of hydrogen cyanamide (HC). Initiation and release of dormancy have been related in other plant species to changes in endogenous hormone concentrations. Therefore, the effect of the aforementioned dormancy release treatments on germination and on endogenous concentration of indole-3-acetic acid (IAA), abscisic acid (ABA), gibberellins GA1, GA3 and GA20 (GAs), zeatin/zeatin riboside and N6(Δ2-isopentenyl) adenine/N6(Δ2-isopentenyl) adenosine was evaluated in oil palm seeds. Heat- and HC-treated seeds germinated above 90% after 37 d, while germination of control seeds was below 4% at the same time. A sharp reduction in ABA concentration in embryos and endosperm was the most notable outcome during the dry-heat and HC treatments, the latter one in a lesser degree. HC treatment additionally caused an increase in IAA levels in embryos and endosperm during the imbibition phase. Changes in concentration of other hormones (e.g., GAs and cytokinins) could not be directly related to dormancy release in this species. Participation of additional factors, such as changes in sensitivity to plant hormones, cannot be ruled out. |
| Quốc gia: | Kérwá |
| Tổ chức giáo dục: | Universidad de Costa Rica |
| Repositorio: | Kérwá |
| OAI Identifier: | oai:kerwa.ucr.ac.cr:10669/77463 |
| Truy cập trực tuyến: | https://www.ingentaconnect.com/content/ista/sst/2008/00000036/00000003/art00007 https://hdl.handle.net/10669/77463 |
| Từ khóa: | Horticulture Oil palm Plant 584.5 Arecidae |