Pošlji prispevek (e-pošta) Vloga dodajanja silicija za preprečevanje strupenosti nano delcev Al2O3 pri ječmenu (Hordeum vulgare L.)
Povzetek
V raziskavi je bil uporabljen silicij (Si), v obliki 2 mM K2SiO3, za preprečevanje strupenosti nano delcev aluminijeva oksida (Al2O3;NPs) pri ječmeni (Hordeum vulgare L.). Analiza z ICP-MS je pokazala, da so bili nano delci Al2O3 privzeti v rastline. Na rast ječmena je negativno vplival dodatek 3 g l-1 nano delcev Al2O3, medtem, ko rast ječmena ni bila občutno zmanjšana pri dodatku 1 g l-1 nanodelcev Al2O3, kar kaže, da je učinek nano delcev Al2O3 odvisen od doze. Predhodno obravnavanje rastlin s silicijem je oblažilo toksičen učinek velikih koncentracij nano delcev Al2O3 na rast korenin. Predhodno obravnavanje s Si ni zmanjšalo privzema nano delcev Al2O3 v korenine ampak zmanjšalo njihovo kopičenje v poganjkih. Omejitev translokacije nano delcev Al2O3 iz korenin v poganjke se je izkazala kot pomemben mehanizem preprečevanja njihove toksičnosti s silicijem. Pojav oksidacijskega stresa pri obravnavanju z 3 g l-1 nano delci Al2O3 je bil ovrednoten s kopičenjem malondialdehida (MDA). Dodajanje silicija lahko prepreči nastanek toksičnih znakov, ki jih povzročajo nano delci Al2O3 preko zmanjšanja peroksidacije lipidov s povečevanjem aktivnost katalaze kot tudi z omejevanjem njihove translokacije iz korenin v poganjke. Ti izsledki so prvi neposreden dokaz, da predobravnavanje s silicijem zmanjšuje strupenost nano delcev Al2O3 pri rastlinah.
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DOI: http://dx.doi.org/10.14720/aas.2021.117.1.1378
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