The effect of a colloidal solution of Cu,Zn-nanoparticles on pro-oxidative/antioxidative balance and content of photosynthetic pigments and leaf area of winter wheat plants of steppe (Acveduc) and forest-steppe (Stolichna) ecotypes was investigated in drought conditions. It has been shown that Cu,Zn-nanoparticles decreased the negative effect of drought action upon plants of steppe ecotype Acveduc. In particular, increased activity of antioxidative enzymes reduced the level of accumulation of thiobarbituric acid reactive substances (TBARS) and stabilized the content of photosynthetic pigments and increased relative water content in leaves. Colloidal solution of Cu,Zn-nanoparticles had less significant influence on these indexes in seedlings of the Stolichna variety under drought.
This paper presents research results on the sensitivity of buckwheat (Fagopyrum esculentum Moench.) inoculated with phosphate solubilizing microorganisms (PSM) to phosphorus deficiency using the transformation of major photosynthetic tissues membrane lipids as the indicator. The analysis of glyco-and phospholipids performed has revealed the plants' ability to react to a deficit in phosphorus with the selective accumulation of sulfoquinovosyldiacylglycerol (SQDG) and digalactosyldiacylglycerol (DGDG) along with a decrease in phosphatidylglycerol (PG). Pre-sowing seed bacterization with PSM has balanced out the negative impact of a phosphorus deficiency on plants by stabilizing the PG content and reducing the difference in the PG/SQDG ratio.
Aim. To investigate structural and functional modifications of major components of photosynthetic membranes of endemic antarctic species D. antarctica under UV-B radiation. Methods. For quantitative determination of photosynthetic membrane components we used Arnon’s method (for chlorophylls and carotenoids); separation of carotenoids was carried out by Merzlyak’s method; polar lipids were isolated by Zill and Harmon method in modification of Yakovenko and Mihno; glycolipids separation and identification we carried out by Yamamoto method; and sulfoquinovosyl diacylglycerol content was determined by Kean method. The separation, disintegration and determination of pigment-protein complexes of chloroplasts were carried out by Anderson method. Authenticity of differences between the mean arithmetic values of indices was set after the Student criterion. Differences were considered as reliable at p 0.05. Results. We determined structural and functional changes in lipids, carotenoids and pigment-protein complexes at the photosyntetic apparatus level in D. antarctica plants under UV-B radiation. Conclusions. Adaptation of D. antarctica plants to UV-B radiation is accompanied by a cascade of physiological and biochemical rearrangements at the level of photosynthetic apparatus, manifested as the changes in pigment, lipid and pigment-protein complexes conten
Deschampsia antarctica (endemic of Antarctic region) and Deschampsia caespitosa (inhabitant of moderate climate regions) are two plant species of Poaceae. The influences of UV-B radiation and H 2 O 2 on photosynthetic apparatus of these plants were studied. UV-B radiation induced degradation of chlorophyll a and β-carotene in leaves of plants of both Deschampsia species. The content of galactolipids in leaves of both species under conditions of UV-B radiation varied significantly, but comparatively stable sulfoquinovosyldiacylglycerol (SQDG) content was observed. UV-B radiation caused slight decrease of Q A pool oxidation level in D. antarctica leaves and increase of this index in leaves of D. caespitosa plants. Also UV-B action induced slight decrease of non-photochemical quenching in D. caespitosa leaves, but PS II quantum efficiency of charge separation φ p was unchanged. The ratio between the monomeric and oligomeric forms of LHC II (LHCP1/LHCP3) in photosynthetic apparatus of leaves of irradiated plants increased, especially significantly in leaves of D. caespitosa plants. H 2 O 2 treatment cause insignificant decrease of SOD activity of both species. Pigment composition was characterized by increase of carotenoids content in leaves of D.antarctica plants and chlorophyll a content in both species. Glycolipid content was stable and SQDG content slightly increased in leaves of D.antarctica plants after H 2 O 2 treatment.
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