Seasonal changes of the glutathione-ascorbate cycle components content in shoots of the mosses on the sulfur deposits dump area

N. Kyyak

Institute of Ecology of the Carpathians, NAS of Ukraine
11, Stefanyk St., Lviv 79000, Ukraine

Seasonal changes of the contents of ascorbic acid, glutathione and their metabolits in shoots of the mosses Bryum argenteum Hedw. and Bryum caespiticium Hedw. on the area of sulfur deposits dump were investigated. It was established that under favourable microclimatic conditions in the moss cells an equilibrium between components of the glutathione-ascorbate cycle is displaced to the ascorbic acid and reduced glutathione accumulation, that reveal reserve properties of the bryophytes antioxidative system. In the unfavorable hydrothermical regime the diminishing of the content of low-molecular antioxidants in plants and accumulation of its oxidized forms was indicated. It was showed that ascorbate and glutathione contents are depended on the bryophytes species features. It was established that correlation between reduced and oxidized forms of the ascorbate and glutathione is the important indicator of moss cells redox status and biomarker of the physiological state of plant organism under the conditions of water and temperature stress.

Keywords: ascorbic, dehydroascorbic and diketogulonic acids, glutathione, seasonal changes, bryophytes

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