| Titre : |
Land plants of amphibious Littorella uniflora (L.) Aschers. maintain utilization of CO2 from the sediment |
| Auteurs : |
Soren Laurentius Nielsen, Auteur ; Esperança Gacia, Auteur ; Kaj Sand-Jensen, Auteur |
| Année de publication : |
1991 |
| Article en page(s) : |
pp. 258-262 |
| Langues : |
Anglais (eng) |
| Catégories : |
[habitats/milieux] 2 - Milieux aquatiques non marins
[habitats/milieux] ZH - Zones humides
[Espèces (in biblio)] Littorella uniflora (L.) Asch.
[Thèmes] Biologie végétale
|
| Mots-clés : |
sédimentation macrophyte |
| Résumé : |
""Submerged macrophytes of the isoetid life form derive the majority of their CO2 for photosynthesis from the sediment. The experiments described here were designed to test the hypothesis that root uptake of CO2 is important also in the terrestrial form of Littorella uniflora. The results of 14CO2 experiments showed that sediment CO2 contributed 56% of the total fixation at 0.1mm CO2 in the rhizosphere, 83% at 0.5mm and 96% at 2.5mm. Sediment CO2 in emergent Littorella stands ranged from 0.1 to 1.0mm and averaged 0.5mm. Measurements of the net CO2 exchange over the leaves showed an even higher dependence of the sediment as CO2 source. Littorella leaves had no stomata at the base and densities (ca. 100 mm−2) typical of terrestrial plants at the tip, allowing sediment-derived CO2 to be supplied along the length of the leaf. The stomata permit supply of CO2 from the air during periods of reduced sediment CO2 concentrations (e.g. if the sediment dries up) and regulate transpiration." (source : auteurs) |
| Type de publication : |
périodique |
| Référence biblio : |
Nielsen S., Gacia E., Sand-Jensen K., 1991 - Land plants of amphibious Littorella uniflora (L.) Aschers. maintain utilization of CO2 from the sediment. Oecologia, 88 : 258-262. |
| ID PMB : |
59757 |
| Permalink : |
http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=59757 |
in Oecologia > vol. 88 (Année 1991) . - pp. 258-262
trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Affiner la rechercheLand plants of amphibious Littorella uniflora (L.) Aschers. maintain utilization of CO2 from the sediment in Oecologia, vol. 88 (Année 1991)
