Abstract
Activities of enzymes decomposing hydrogen peroxide (H2O2) under long exposure to hardening low temperatures and the effect of Δ12-acyl-lipid desaturase on these processes were studied on potato (Solanum tuberosum L., cv. Desnitsa), which typically represents cold-tolerant plants. We compared nontransformed plants (control) and the line transformed with the construction carrying the target desA gene of the mentioned desaturase from cyanobacterium Synechocystis sp. PCC (desA-licBM3 plants). The plants were hardened at 5°C for six days under illumination of 50 μmol/(m2 s). The hardening was found to favor plant tolerance to the subsequent frost, and the desA-licBM3 plants exceed the controls in this property. Of the studied H2O2-scavenging enzymes, soluble type III peroxidases (guaiacol peroxidases) displayed the most activity, and type I peroxidase (ascorbate peroxidase) was the least active in the two potato lines over the hardening period. The activity of catalase increased twofold in the control and fourfold in the transformed plants in the first day of the hardening. However, the doubled catalase activity did not appear to compensate the H2O2 accumulation over this period. The recorded rise in catalase activity in the desA-licBM3 plants, together with the high activity of guaiacol peroxidases, favored lowering the hydrogen peroxide level in comparison with the initial values. For the first time, electrophoresis revealed two catalase isoforms, CAT1 and CAT2, in leaves of both potato lines. The significance of CAT1 was greater than that of CAT2 in the total catalase activity during the hardening period. It is concluded that, under the long-term cold hardening of potato plants, the content of hydrogen peroxide is determined by highly active guaiacol peroxidases and Class I catalase exerting energy-independent H2O2 decomposing. In this case, in the transformants that are rich in membrane lipids, where polyunsaturated fatty acids predominate, the activity of H2O2-scavenging enzymes increased significantly more than in the control, which is why the hardening of the transformants is more effective.
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Abbreviations
- CAT1 and CAT2:
-
isoforms of catalase
- FA:
-
fatty acids
- SOD:
-
superoxide dismutase
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Original Russian Text © N.V. Naraikina, M.S. Sin’kevich, A.N. Deryabin, T.I. Trunova, 2018, published in Fiziologiya Rastenii, 2018, Vol. 65, No. 5, pp. 340–347
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Naraikina, N.V., Sin’kevich, M.S., Deryabin, A.N. et al. Activities of Hydrogen Peroxide-Scavenging Enzymes during Low-Temperature Hardening of Potato Plants Transformed by the desA Gene of Δ12-Acyl-Lipid Desaturase. Russ J Plant Physiol 65, 667–673 (2018). https://doi.org/10.1134/S1021443718040064
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DOI: https://doi.org/10.1134/S1021443718040064