Abstract
The work continues serial studies on short-term effects of medium-wave ultraviolet radiation (UV-B) at 12.5 kJ/m2 on plants. Special attention is paid to the rapid response of the antioxidant system. Free and conjugated forms of putrescine polyamines (putrescine, spermine, and spermidine), as well as those of cadaverine, are recognized to be constituents of the antioxidant system. These compounds were analyzed in plants 24 h after UV-B irradiation. Thellungiella salsuginea (Pallas) O.E.Schulz, Salvia officinalis L, Plantago major L., and Geum urbanum L. grown in aquatic culture under phytotron conditions were examined. The results support the hypothesis that putrescine plays the chief role in the plant defense response against medium-wave ultraviolet irradiation. Three of four plants manifested an increase in the content of this polyamine in leaves. It is the change that determines the enhanced total level of free polyamines. We failed to reveal a general tendency in dynamics of levels of conjugated forms of spermine, spermidine, and cadaverine; only conjugates of putrescine demonstrated a distinct increase. This study allows a conclusion that contributions of particular polyamines to the protective response primarily depend on the species to which the investigated plant belongs. It is likely that conjugated polyamines can be reserved as a pool necessary for rapid recovery of free polyamine levels.
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Original Russian Text © N.L. Radyukina, Y.V. Ivanov, S. Mapelli, L.E. Mikheeva, E.A. Karbysheva, 2017, published in Vestnik Moskovskogo Universiteta, Seriya 16: Biologiya, 2017, Vol. 72, No. 3, pp. 179–183.
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Radyukina, N.L., Ivanov, Y.V., Mapelli, S. et al. Effects of medium-wave ultraviolet radiation on levels and spectrum of polyamines in leaves and roots of wild-growing plants. Moscow Univ. Biol.Sci. Bull. 72, 155–158 (2017). https://doi.org/10.3103/S0096392517030087
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DOI: https://doi.org/10.3103/S0096392517030087