Reimposition of conditional dormancy during air-dry storage of prechilled Sitka spruce seeds
| Autor: | Richard Ellis, Steve K. Jones, Peter G. Gosling |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Seed Science Research. 8:113-122 |
| ISSN: | 1475-2735 0960-2585 |
| DOI: | 10.1017/s0960258500004001 |
| Popis: | Prechilling seeds of Sitka spruce (Picea sitchensis[Bong.] Carr.) at 4°C with 30% moisture content for 12–14 weeks (84–98 d) removed conditional dormancy (i.e. they were then able to germinate at 10°C). The non-dormant status was preserved after redrying to 6% moisture content. However, conditional dormancy was gradually reimposed during subsequent air-dry storage at 4°C and 6% seed moisture content in all five seed lots tested. Further investigations with one seed lot showed that reimposition was reversed by a second prechill treatment, but was reimposed again during subsequent air-dry storage. The trend of dormancy reimposition within seed lots over time was quantified by negative exponential relations between ability to germinate at 10°C and duration of air-dry storage. The progress of dormancy reimposition was influenced by seed storage moisture content and was most rapid at 4–10%. At higher moisture contents (15 and 20%) the rate of the reimposition of conditional dormancy was much reduced, while at moisture contents of 25 and 30% further loss in dormancy occurred. Thus it is clear that dormancy reimposition occurred during storage at low water potential rather than solely during desiccation from high to low water potential. |
| Databáze: | OpenAIRE |
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