| Popis: |
—The climatic cataclysms taking place in different corners of the world are clear confirmation of the climate negative change in our planet. Especially disturbing is the temperature rise, accompanied by hot waves, forest fires, intensive melting of the ice cover, and other undesirable aftereffects. Under these conditions chances of dying of many plant species significantly increases. Drought resistant plants have the highest potential of adaptation to increased temperature and water deficiency. Thus, knowledge of their biology will be especially important in deserted regions restoration. The nonspecific mechanisms of resistance, especially antioxidant system, are concerned as one of the leading in plants drought resistance. The presented study aimed the comparative study of the indices of antioxidant system of drought resistant species - Astragalus microcephalus Willd. (Astracantha microcephala (Willd.) Podlech) - goat’s thorn, Theucrium polium L. – felty germander, Euphorbia seguieriana Neck. - spurge, Capparis spinosa L. – caper bush, Paliurus spina-christi Mill. – Christ’s thorn, growing in different arid habitats of the East Georgia (Iagludja and Kvernaqi hills). The defence mechanisms of the antioxidant system appeared to be partially different in one and the same species of various habitats, as well as in different species of the same habitats. Activation of phenolic substances and anthocyanins synthesis against extreme conditions of both habitats (water deficiency, high temperature and intensive irradiation) was common for all tested species. Additionally, activation of peroxidase in Kvernaqi species and intensive accumulation of soluble carbohydrates in Iagludja plants was mentioned. |
