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The plasma membrane-associated NADH oxidase of spinach leaves responds to blue lightThe plasma membrane-associated NADH oxidase (NOX) of spinach leaf disks is characterized by oscillations in activity with a regular period length of ca. 24 min. Within a single population of plants exposed to light at the same time, NOX activities of all plants function synchronously. Exposure of plants transferred from darkness to blue light (495 nm, 2 min, 50 micromoles m-2 s-1) resulted in a complex response pattern but with a new maximum in the rate of NOX activity 36 (24+12) min after illumination and then with maxima in the rate of NOX activity every 24 min thereafter. Transient maxima in NOX activity were observed as well after 9.3 + /- 1.4 and 20.7 +/- 2.1 min. The blue light response differed from the response to red (650 nm, 10 min, 50 micromoles m-2 s-1) or white light where activity maxima were initiated 12 min after the light exposure followed by maxima every 24 min thereafter. Green or yellow light was ineffective. The light response was independent of the time in the 24-min NOX cycle when the light was given. The net effects of blue and red light were ultimately the same with a new maximum in the rate of NOX activity at 12+24=36 min (and every 24 min thereafter), but the mechanisms appear to be distinct.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Morre, D. James
(Purdue University West Lafayette, Indiana 47907, United States)
Penel, Claude
Greppin, Hubert
Morre, Dorothy M.
Date Acquired
August 21, 2013
Publication Date
July 1, 2002
Publication Information
Publication: International journal of plant sciences
Volume: 163
Issue: 4
ISSN: 1058-5893
Subject Category
Life Sciences (General)
Distribution Limits
NASA Discipline Cell Biology
Non-NASA Center

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