Articles
VITAMIN E (α-TOCOPHEROL) AGAINST OXIDATIVE STRESS IN APPLE TREES
Article number
422_110
Pages
427 – 428
Language
Abstract
In plants the influence of oxidative stress brought about by heat, ozone, water deficiency or pesticides, is known to induce peroxidation of unsaturated membrane fatty acids and release of free oxygen radicals during photosynthesis.
The aggressive oxygen species of H2O2 and OH can initiate the breakdown of lipids and proteins, and rapidly inhibit photosynthesis (DAUB, 1982). Protection against phytotoxic peroxidation may be achieved by several antioxidants, such as glutathione and the vitamins E and C (FRYER, 1992). Vitamin E, however, seems to be the most effective lipophilic radical-chain-breakdown substance. a-Tocopherol biosynthesis takes place inside the chloroplast membranes of the plant (SCHULZ, 1990). Its antioxidant activity is thus quite useful in plant leaves as a means of protection against metabolic disorders.
The aggressive oxygen species of H2O2 and OH can initiate the breakdown of lipids and proteins, and rapidly inhibit photosynthesis (DAUB, 1982). Protection against phytotoxic peroxidation may be achieved by several antioxidants, such as glutathione and the vitamins E and C (FRYER, 1992). Vitamin E, however, seems to be the most effective lipophilic radical-chain-breakdown substance. a-Tocopherol biosynthesis takes place inside the chloroplast membranes of the plant (SCHULZ, 1990). Its antioxidant activity is thus quite useful in plant leaves as a means of protection against metabolic disorders.
Authors
H. Obaid, G. Noga
Keywords
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