engleski

Protective role of hydrogen sulphide and selenium in wheatgrass (Triticum aestivum L.) under temperature stress

Due to similar electrochemical properties, the plants often assimilate selenium and sulfur through the same membrane transporters. Selenium is a beneficial element for plants that is involved in sulfur assimilation pathways and can replace sulfur in organic compounds without the adverse effects on their physiological function. Also, both elements are known to be extremely important in plants’ response to abiotic and biotic stress. The aim of this study was to determine the effect of sodium hydrogen sulfide (NaHS) solution, sodium selenate (Na2SeO4) and their combinations on the content of chloroplast pigments, phenols, flavonoids, vitamin C, proline and the level of lipid peroxidation in three cultivars of wheat grass (Triticum aestivum L.), grown at 10, 20 and 30ºC. Significantly higher contents of phenols and flavonoids were found in wheatgrass plants grown at 10°C. Regarding the cultivar Katarina, the highest content of vitamin C and proline was determined in the variant of seed priming by the combination of Na2SeO4 and NaHS solutions. The highest level of lipid peroxidation was found in the hydro-priming variant. In the cultivar Osječka 20, the highest content of vitamin C was found in plants developed from hydro-primed seeds, and in the case of cultivar Super Žitarka this was seen in the NaHS- priming variant. The results of this research confirm the protective role of both tested elements at growing temperatures outside the optimum limits for wheatgrass, because they affect the synthesis of protective molecules and signaling components in plant metabolism. Also, it has been proven that there is a genetic specificity of wheat grass in response to seed priming variants at different growing temperatures.

phenols ; chloroplast pigments ; proline ; vitamin C

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