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- Title
Studies of Auxin Protectors VIII. Evidence that Auxin Protectors Act as Cellular Poisers.
- Authors
Stonier, Tom; Hudek, Joseph; Yang, Robert Vande-Mei; HSIN-MEI YANG
- Abstract
Auxin protectors completely inhibit the peroxidase-catalyzed oxidation of indoleacetic acid (IAA). Presumably only when the protector substance itself has been oxidized, does IAA oxidation begin. Reduced nicotinamide-adenine dinucleotide (NADH) mimics the native auxin protectors: In the presence of NADH, the peroxidase-catalyzed oxidation of IAA does not begin until almost all the NADH has been oxidized. Auxin protectors slow the oxidation of NADH in the presence of the peroxidase complex (enzyme plus manganese). However, in the absence of the peroxidase complex, protectors actually accelerate the spontaneous oxidation of NADH. Protectors can also accelerate the oxidation of the dye 2,6-dichlorophenol-indophenol, especially in the presence of manganese. Protector oxidized by boiling with traces of hydrogen peroxide will act as an electron acceptor in the peroxidase-catalyzed oxidation of NADH. The reversible redox role of auxin protectors implies that they can act as cellular poisers.
- Subjects
INDOLEACETIC acid; PHYSIOLOGICAL effects of auxin; NICOTINAMIDE; PEROXIDASE; OXIDATION; PLANT physiology
- Publication
Physiologia Plantarum, 1970, Vol 23, Issue 4, p775
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1970.tb06473.x