[article]
| Titre : |
Influence of temperature on seed germination in seven Mediterranean grassland species from SE Portugal |
| Auteurs : |
I. Marques, Auteur ; David Draper, Auteur ; M. A. Martins-Loução, Auteur |
| Année de publication : |
2007 |
| Article en page(s) : |
pp. 367-372 |
| Langues : |
Anglais (eng) |
| Catégories : |
[ZG] Portugal
[Espèces (in biblio)] Bellardia trixago
[Espèces (in biblio)] Daucus carota
[Espèces (in biblio)] Petrorhagia nanteuilii
[Espèces (in biblio)] Scabiosa atropurpurea
[Espèces (in biblio)] Silene colorata
[Espèces (in biblio)] Silene gallica
[Thèmes] Germination des graines
|
| Résumé : |
"The aim of this work was to analyze seed germination characteristics between species that share the same habitat. We studied the influence of temperature on the germination of seven species that grow in grassland areas of SE Portugal: Bellardia trixago (L.) All. (Scrophulariaceae), Daucus carota L. (Apiaceae), Petrorhagia nanteuilii (Burnat) P.W. Ball & Heywood (Caryophyllaceae), Scabiosa atropurpurea L., S. simplex Desf. (Dipsacaceae), Silene colorata Poiret and S. gallica L. (Caryophyllaceae). Seeds were incubated under 16/8 hours light/dark photoperiod, constant 15ºC, 20ºC or 25ºC and alternating 25/15ºC temperature conditions. Final germination percentage, germination rate (T50), uniformity (T75-T25) and skewness (T50/Mean Germination Time) were obtained. Seed germinability varied among the tested temperatures.
B. trixago, D. carota, P. nanteuilii, Scabiosa atropurpurea and S. simplex presented the highest results at the lowest temperatures although D. carota seemed indifferent to the tested temperatures. S. colorata and S. gallica only germinated at 25ºC and 15/25ºC but the very low results suggest that seeds may present dormancy. All the species presented a rapid and constant germination with most seeds germinating in the first days. In general, the seven species showed different behavior among the assayed temperatures, which allow these species to explore different ecological conditions in the same habitat." (source : auteurs) |
| Type de publication : |
périodique |
| Référence biblio : |
Marques I., Draper D., Martins-Loução M.-A., 2007 - Influence of temperature on seed germination in seven Mediterranean grassland species from SE Portugal. Bocconea, 21 : 367-372. |
| ID PMB : |
72173 |
| Permalink : |
http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=72173 |
in Bocconea > vol. 21 (Année 2007) . - pp. 367-372
[article]
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