| Titre : |
A contribution to the natural history of Althenia filiformis Petit (Zannichelliaceae) |
| Type de document : |
texte imprimé |
| Auteurs : |
Christopher D. K. Cook, Auteur ; You-Hao Guo, Auteur |
| Année de publication : |
1990 |
| Article en page(s) : |
pp. 261-281 |
| Langues : |
Anglais (eng) |
| Catégories : |
[Espèces (in biblio)] Althenia filiformis Petit
|
| Mots-clés : |
croissance cycle de développement germination microscopie électronique balayage morphologie plante aquatique reproduction |
| Résumé : |
"Althenia filiformis Petit is a habitual colonizer of brackish water. In Sardinia, at least, it is annual and dependent on sexual reproduction. Seeds remain in the fruit and germinate underwater. Some seeds germinate while still on the mother plant, others after a period of desiccation ; low temperatures or periods in darkness induce germination of dormant seeds. Althenia is not able to utilize HC03 –and is dependent on C02 as a carbon source. The leaves reach the water surface where they not only get C02, but are exposed to considerable wave action. They thus have relatively large marginal bundies of fibres. Althenia is monoecious, but some male and female flowers develop close together and form a bisexual floral unit. Pollination takes place either on the upper surface of the water ( epihydrophily} or inside gas bubbles underwater (bubble autogamy) - which accounted for about half the seed set in cultivated populations. The pollen does not form stable rafts or "search vehicles", but spreads as individual grains over the water surface. Pollination at the water surface probably Ieads to a high degree of outbreeding." (source : auteur) |
| Type de publication : |
périodique |
| Référence biblio : |
Cook C.-K., Guo Y.-H., 1990 - A contribution to the natural history of Althenia filiformis Petit (Zannichelliaceae). Aquatic Ecology, 38 : 261-281. |
| ID PMB : |
48237 |
| Permalink : |
http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=48237 |
in Aquatic Ecology > vol. 38 (1990) . - pp. 261-281
A contribution to the natural history of Althenia filiformis Petit (Zannichelliaceae) in Aquatic Ecology, vol. 38 (1990)