Temporal dynamics of seedling emergence among four fire ephemerals: The interplay of after-ripening and embryo growth with smoke
The flora of Mediterranean ecosystems contains families with species having fully and under-developed embryos in their seeds. After-ripening for physiological dormancy release and smoke influence germination in many species. We investigated how after-ripening and embryo growth interact with smoke to...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | English |
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CAMBRIDGE UNIV PRESS
2019
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| Online Access: | http://purl.org/au-research/grants/arc/LP0455415 http://hdl.handle.net/20.500.11937/88497 |
| _version_ | 1848765026707439616 |
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| author | Hidayati, S.N. Merritt, D.J. Turner, Shane Dixon, Kingsley Walck, J.L. |
| author_facet | Hidayati, S.N. Merritt, D.J. Turner, Shane Dixon, Kingsley Walck, J.L. |
| author_sort | Hidayati, S.N. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The flora of Mediterranean ecosystems contains families with species having fully and under-developed embryos in their seeds. After-ripening for physiological dormancy release and smoke influence germination in many species. We investigated how after-ripening and embryo growth interact with smoke to influence the temporal dynamics of seedling emergence among fire ephemerals. Seeds were placed in the field and under standardized (50% relative humidity, 30°C) laboratory conditions to test the effects of summer conditions on physiological dormancy loss. Germination was tested with water or smoke compounds (smoke water, KAR1) at a simulated autumn/winter temperature (18/7°C). The timing and amount of seedling emergence with smoke was observed for seeds exposed to near-natural conditions. During summer, physiological dormancy was broken in all species, enabling germination at autumn/winter but not summer temperatures; no embryo growth occurred in seeds with under-developed embryos. At the start of the wet season, seedling emergence from seeds with fully developed embryos occurred earlier than from seeds with under-developed embryos. In a non-consistent manner among our study species, smoke and smoke compounds influenced the rate of embryo growth and amount of germination. Effects of smoke were noticeable in terms of number of emergents in the first emergence season. Among ecologically similar species, we have shown (1) that both thermal and embryo traits exclude germination in the summer, (2) how embryo size influences the timing of seedling emergence in autumn-winter, and (3) a reduced requirement for smoke in the second emergence season after a fire with a shift to reliance on seasonal cues for emergence. |
| first_indexed | 2025-11-14T11:28:42Z |
| format | Journal Article |
| id | curtin-20.500.11937-88497 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:28:42Z |
| publishDate | 2019 |
| publisher | CAMBRIDGE UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-884972022-06-09T03:21:50Z Temporal dynamics of seedling emergence among four fire ephemerals: The interplay of after-ripening and embryo growth with smoke Hidayati, S.N. Merritt, D.J. Turner, Shane Dixon, Kingsley Walck, J.L. Science & Technology Life Sciences & Biomedicine Plant Sciences embryos ephemerals fire KAR(1) Mediterranean climate seedling emergence smoke smoke water GERMINATION DORMANCY BUTENOLIDE SEEDS TEMPERATURE VEGETATION NUTRIENTS LIGHT WATER The flora of Mediterranean ecosystems contains families with species having fully and under-developed embryos in their seeds. After-ripening for physiological dormancy release and smoke influence germination in many species. We investigated how after-ripening and embryo growth interact with smoke to influence the temporal dynamics of seedling emergence among fire ephemerals. Seeds were placed in the field and under standardized (50% relative humidity, 30°C) laboratory conditions to test the effects of summer conditions on physiological dormancy loss. Germination was tested with water or smoke compounds (smoke water, KAR1) at a simulated autumn/winter temperature (18/7°C). The timing and amount of seedling emergence with smoke was observed for seeds exposed to near-natural conditions. During summer, physiological dormancy was broken in all species, enabling germination at autumn/winter but not summer temperatures; no embryo growth occurred in seeds with under-developed embryos. At the start of the wet season, seedling emergence from seeds with fully developed embryos occurred earlier than from seeds with under-developed embryos. In a non-consistent manner among our study species, smoke and smoke compounds influenced the rate of embryo growth and amount of germination. Effects of smoke were noticeable in terms of number of emergents in the first emergence season. Among ecologically similar species, we have shown (1) that both thermal and embryo traits exclude germination in the summer, (2) how embryo size influences the timing of seedling emergence in autumn-winter, and (3) a reduced requirement for smoke in the second emergence season after a fire with a shift to reliance on seasonal cues for emergence. 2019 Journal Article http://hdl.handle.net/20.500.11937/88497 10.1017/S0960258519000084 English http://purl.org/au-research/grants/arc/LP0455415 CAMBRIDGE UNIV PRESS restricted |
| spellingShingle | Science & Technology Life Sciences & Biomedicine Plant Sciences embryos ephemerals fire KAR(1) Mediterranean climate seedling emergence smoke smoke water GERMINATION DORMANCY BUTENOLIDE SEEDS TEMPERATURE VEGETATION NUTRIENTS LIGHT WATER Hidayati, S.N. Merritt, D.J. Turner, Shane Dixon, Kingsley Walck, J.L. Temporal dynamics of seedling emergence among four fire ephemerals: The interplay of after-ripening and embryo growth with smoke |
| title | Temporal dynamics of seedling emergence among four fire ephemerals: The interplay of after-ripening and embryo growth with smoke |
| title_full | Temporal dynamics of seedling emergence among four fire ephemerals: The interplay of after-ripening and embryo growth with smoke |
| title_fullStr | Temporal dynamics of seedling emergence among four fire ephemerals: The interplay of after-ripening and embryo growth with smoke |
| title_full_unstemmed | Temporal dynamics of seedling emergence among four fire ephemerals: The interplay of after-ripening and embryo growth with smoke |
| title_short | Temporal dynamics of seedling emergence among four fire ephemerals: The interplay of after-ripening and embryo growth with smoke |
| title_sort | temporal dynamics of seedling emergence among four fire ephemerals: the interplay of after-ripening and embryo growth with smoke |
| topic | Science & Technology Life Sciences & Biomedicine Plant Sciences embryos ephemerals fire KAR(1) Mediterranean climate seedling emergence smoke smoke water GERMINATION DORMANCY BUTENOLIDE SEEDS TEMPERATURE VEGETATION NUTRIENTS LIGHT WATER |
| url | http://purl.org/au-research/grants/arc/LP0455415 http://hdl.handle.net/20.500.11937/88497 |