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Plasma membrane NADH oxidase of maize roots responds to gravity and imposed centrifugal forcesNADH 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.
Document ID
20040088296
Document Type
Reprint (Version printed in journal)
Authors
Bacon, E. (Purdue University West Lafayette, IN 47907-1333, United States)
Morre, D. J.
Date Acquired
August 21, 2013
Publication Date
June 1, 2001
Publication Information
Publication: Plant physiology and biochemistry : PPB / Societe francaise de physiologie vegetale
Volume: 39
Issue: 6
ISSN: 0981-9428
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAG2-1344
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Cell Biology
Non-NASA Center