Abstract
The effects of potato (Solanum tuberosum L., cv. Desnitsa) plant transformation with the desA gene encoding Δ12-acyl-lipid desaturase from Synechocystis sp. PCC 6803 on the regulation of free-radical processes in relation to plant tolerance to hypothermia are considered. It was shown that the content of polyunsaturated fatty acids (PUFA) in transformed plants was higher than in wild-type ones. In particular, the content of linoleic acid in transformants was higher by 35% and the content of linolenic acid was by 41% higher than in untransformed plants. In addition, transformation induced an increase in the absolute content of C16-PUFA and on the whole resulted in a marked accumulation of membrane lipids. As judged from the values of the damage index and the ratio of photosynthesis to respiration in wild-type and transformed plants under cold treatment, these changes in lipid metabolism favored the protection of coupling membranes, thus preventing plants against free-radical oxidation under low-temperature stress. As a result, the intensity of oxidative stress in transformed plants was much lower than in wild-type ones, whereas antioxidant enzymes (superoxide dismutase, catalase, peroxidase) were not substantially activated under hypothermia.
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Abbreviations
- CAT:
-
catalase
- ETC:
-
electron transport chain
- FA:
-
fatty acids
- UI:
-
unsaturation index
- NBT:
-
nitro blue tetrazolium
- POD:
-
peroxidase
- POL:
-
peroxidation of lipids
- PUFA:
-
polyunsaturated fatty acids
- SOD:
-
superoxide dismutase
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Original Russian Text © I.N. Demin, N.V. Naraikina, V.D. Tsydendambaev, I.E. Moshkov, T.I. Trunova, 2013, published in Fiziologiya Rastenii, 2013, Vol. 60, No. 3, pp. 377–385.
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Demin, I.N., Naraikina, N.V., Tsydendambaev, V.D. et al. The effect of potato plant transformation with the gene encoding Δ12-acyl-lipid desaturase on the CO2 exchange and activities of antioxidant enzymes under hypothermia. Russ J Plant Physiol 60, 367–374 (2013). https://doi.org/10.1134/S1021443713020040
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DOI: https://doi.org/10.1134/S1021443713020040