The effect of abscisic acid on epidermal cells: protoplast swelling and ATPase activity
| Autor: | Nurit Roth-Bejerano, Chanan Itai |
|---|---|
| Rok vydání: | 1986 |
| Předmět: |
chemistry.chemical_classification
integumentary system biology Physiology ATPase fungi food and beverages Stimulation Cell Biology Plant Science General Medicine Protoplast biology.organism_classification chemistry.chemical_compound Enzyme chemistry Biochemistry Genetics Biophysics biology.protein Commelina communis Sodium orthovanadate Abscisic acid Ion transporter |
| Zdroj: | Physiologia Plantarum. 66:664-668 |
| ISSN: | 1399-3054 0031-9317 |
| DOI: | 10.1111/j.1399-3054.1986.tb05596.x |
| Popis: | Isolated epidermal protoplasts of Commelina communis L. increase in volume in the presence of KCl. Since this swelling is an osmotic phenomenon it reflects K+ influx. ATP slightly decreased the volume of the protoplasts, pointing towards the possibility that K+ uptake is passive. On the other hand abscisic acid (ABA) and sodium orthovanadate increased the swelling, and their effect was reversed by ATP. This may support the suggestion that ABA inhibits the active and ATPase-mediated relase of K+ from epidermal cells. Mg2+-dependent, K+-stimulated ATPase activity was found in the microsomal fraction from epidermal cells. This activity was vandadate sensitive. ABA increased the basal activity in the presence of Mg2+ but inhibited the K+ stimulation. |
| Databáze: | OpenAIRE |
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