Germination Patterns of Dimorphic Achenes in Three Related Species ofScorzoneroides(Asteraceae, Lactuceae) Growing in Different Environments
| Autor: | M. Luisa Buide, Eduardo Narbona, Gema Cruz-Mazo |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Annales Botanici Fennici. 47:337-345 |
| ISSN: | 1797-2442 0003-3847 |
| DOI: | 10.5735/085.047.0503 |
| Popis: | Scorzoneroides palisiae, S. salzmannii, and S. muelleri (Asteraceae) are phylogenetically close annuals with dimorphic achenes. Although these three species are characteristic to areas with some degree of disturbance, S. palisiae and S. salzmannii grow in Mediterranean environments, whereas S. muelleri preferentially grows in semi-arid environments. This study compared the germination characteristics of central and peripheral achenes subjected to different storage times. Both central and peripheral achenes of the three Scorzoneroides species were completely dormant immediately after dispersal. This dormancy was reduced after six months in dry storage, and practically disappeared after more than a year in storage. Six-month central achenes of S. palisiae and S. salzmannii displayed lower dormancy levels than peripheral achenes did, producing a mixed germination pattern. However, 6-month central achenes of S. muelleri displayed the same dormancy levels as those of peripheral achenes. Furthermore, there was ... |
| Databáze: | OpenAIRE |
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