Sensitivity cycling to physical dormancy break and seed vigour of twoIpomoeaspecies (Convolvulaceae)
| Autor: | Jerry M. Baskin, Carol C. Baskin, K. M. G. Gehan Jayasuriya, Dennis M. TeKrony |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Seed Science Research. 19:249-259 |
| ISSN: | 1475-2735 0960-2585 |
| DOI: | 10.1017/s0960258509990158 |
| Popis: | The physically dormant seeds ofIpomoea lacunosaand ofI. hederaceaundergo sensitivity cycling (insensitive ↔ sensitive) to dormancy-breaking treatment. Sensitivity cycling is important to seeds with physical dormancy in sensing appropriate environmental conditions for germination. Seed vigour is also important to seedling establishment, but no study has compared changes in vigour (or not) with changes in sensitivity. This study was conducted to determine the relationship between sensitivity cycling and seed vigour inI. lacunosaandI. hederacea. The seed moisture contents of insensitive and sensitive seeds ofI. lacunosaand of sensitive seeds ofI. hederaceawere measured, and several vigour tests were performed. Vigour of sensitive seeds ofI. lacunosadecreased more rapidly than that of insensitive seeds. No significant change in vigour was observed in either permeable or impermeable seeds ofI. hederacea. We conclude that sensitivity cycling to physical dormancy break is important in maintaining vigour ofI. lacunosaseeds in the soil seed-bank. |
| Databáze: | OpenAIRE |
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