Morillon Raphaël, Catterou Manuella, Sangwan Rajbir S., Sangwan Brigitte S., Lassalles Jean-Paul. 2001. Brassinolide may control aquaporin activities in Arabidopsis thaliana. Planta, 212 (2) : 199-204.
![[img]](http://agritrop.cirad.fr/style/images/fileicons/text.png) |
Version publiée
- Anglais
Accès réservé aux personnels Cirad Utilisation soumise à autorisation de l'auteur ou du Cirad. Morillon et al b 2001.pdf Télécharger (147kB) | Demander une copie |
Résumé : It is usually assumed that aquaporins present in the cellular membranes could be an important route in the control of water flux in plants, but evidence for this hypothesis is scarce. In this paper, we report measurements of the osmotic permeability (P os ) of protoplasts isolated from hypocotyls of wild-type and mutant Arabidopsis thaliana (L.) Heynh. Mutants were affected in their growth and exhibited different sensitivities to the phytohormone, brassinolide. For the two mutants studied (cpd: constitutive photomorphogenesis and dwarfism; bri1: brassinosteroid insensitive), hypocotyl length was correlated to P os for the protoplasts. Under experimental conditions where hypocotyl growth had ceased, restoration of root, hypocotyl and petiole growth by brassinolide was correlated with an increase in P os of the hypocotyl protoplasts. We consider that the increase in P os of the hypocotyl cells was needed because these cells were part of the transcellular water pathway of the plant. This is the first time, to our knowledge, that brassinolide has been shown to be involved in the modification of the water-transport properties of cell membranes. Our results also emphasize the importance of aquaporins and the transcellular pathway in water transport under normal growth conditions.
Mots-clés Agrovoc : Arabidopsis thaliana, brassinolide, brassinostéroïde, protoplaste, perméabilité membranaire, pression osmotique, physiologie cellulaire, physiologie végétale
Mots-clés complémentaires : aquaporine
Mots-clés libres : Arabidopsis (brassinolide), Aquaporin, Brassinosteroid, Osmotic water permeability, Protoplast (aquaporin)
Classification Agris : F60 - Physiologie et biochimie végétale
Auteurs et affiliations
- Morillon Raphaël, Université de Rouen (FRA)
- Catterou Manuella, UPJV (FRA)
- Sangwan Rajbir S., UPJV (FRA)
- Sangwan Brigitte S., UPJV (FRA)
- Lassalles Jean-Paul, Université de Rouen (FRA) - auteur correspondant
Source : Cirad-Agritrop (https://agritrop.cirad.fr/597500/)
[ Page générée et mise en cache le 2024-12-18 ]
