role of l-ascorbic acid recycling in responding to environmental stress and in promoting plant growth

l-Ascorbic acid (Asc) is the most abundant water-soluble antioxidant in plants. It serves as a cofactor for enzymes involved in photosynthesis, hormone biosynthesis, and the regeneration of antioxidants such as α-tocopherol. Once used, Asc can be recycled by several different mechanisms. The short-l...

Full description

Saved in:
Bibliographic Details
Published in:Journal of experimental botany 2013-01, Vol.64 (2), p.433-443
Main Author: Gallie, Daniel R
Format: Article
Language:English
Subjects:
alpha-tocopherol
antioxidants
Ascorbic Acid - metabolism
Biochemistry
Biological and medical sciences
Biosynthesis
Ecosystem
Electrons
Fundamental and applied biological sciences. Psychology
germination
glutathione dehydrogenase (ascorbate)
Guard cells
hydrolysis
monodehydroascorbate reductase (NADH)
NADH, NADPH Oxidoreductases - metabolism
oxidation
Oxidoreductases - metabolism
Ozone
photosynthesis
Plant cells
Plant Development
plant growth
Plant physiology
Plant physiology and development
Plant Proteins - metabolism
Plants
Plants - enzymology
Plants - metabolism
reactive oxygen species
Reactive Oxygen Species - metabolism
Recycling
reproduction
REVIEW PAPER
Stress, Physiological
Zygotes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:l-Ascorbic acid (Asc) is the most abundant water-soluble antioxidant in plants. It serves as a cofactor for enzymes involved in photosynthesis, hormone biosynthesis, and the regeneration of antioxidants such as α-tocopherol. Once used, Asc can be recycled by several different mechanisms. The short-lived monodehydroascorbate (MDHA) radical, produced following Asc oxidation, can be recycled following reduction by ferredoxin or monodehydroascorbate reductase (MDAR). MDHA can also undergo disproportionation into dehydroascorbate (DHA) and Asc. DHA can be recycled into Asc by dehydroascorbate reductase (DHAR) before it undergoes irrevocable hydrolysis. Through its recycling, Asc content and its redox state are maintained, which is critical under conditions of high demand, for example during high light or other stress conditions that increase reactive oxygen species (ROS) production. This review provides an overview of research in the last decade revealing the role that Asc recycling plays during germination, growth, and reproduction, as well as in response to environmental stress. These findings highlight the importance of DHAR- and MDAR-mediated mechanisms of Asc recycling in maintaining ROS at non-damaging levels while modulating ROS signalling function.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/ers330