Plasma membrane NADH oxidase of maize roots responds to gravity and imposed centrifugal forces
| Autor: | Emily P. Bacon, D. J. Morre |
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| Rok vydání: | 2001 |
| Předmět: |
Periodicity
Gravity (chemistry) Physiology Gravitropism Centrifugation Stimulation Hypergravity Plant Science Biology Plant Roots Zea mays Multienzyme Complexes Auxin Genetics NADH NADPH Oxidoreductases chemistry.chemical_classification Oxidase test Herbicides Cell Membrane Membrane Biochemistry chemistry Biophysics 2 4-Dichlorophenoxyacetic Acid Gravitation |
| Zdroj: | Plant Physiology and Biochemistry. 39:487-494 |
| ISSN: | 0981-9428 |
| DOI: | 10.1016/s0981-9428(01)01267-0 |
| Popis: | NADH oxidase activities measured with excised roots of dark-grown maize (Zea mays) seedlings and with isolated plasma membrane vesicles from roots of dark-grown maize oscillated with a regular period length of 24 min and were inhibited by the synthetic auxin 2,4-dichlorophenoxyacetic [correction of dichorophenoxyacetic] acid. The activities also responded to orientation with respect to gravity and to imposed centrifugal forces. Turning the roots upside down resulted in stimulation of the activity with a lag of about 10 min. Returning the sections to the normal upright position resulted in a return to initial rates. The activity was stimulated reversibly to a maximum of about 2-fold with isolated plasma membrane vesicles, when subjected to centrifugal forces of 25 to 250 x g for 1 to 4 min duration. These findings are the first report of a gravity-responsive enzymatic activity of plant roots inhibited by auxin and potentially related to the gravity-induced growth response. c2001 Editions scientifiques et medicales Elsevier SAS. |
| Databáze: | OpenAIRE |
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