Size-dependent biological effects of copper nanopowders on mustard seedlings

Abstract

Correlation between the size of copper nanoparticles and effects they produce on white mustard seedlings were studied in the paper. Copper nanopowders with average particle sizes of 45 and 200 nm with concentrations of 0.01–1000 wt ppm of seeds were used to treat white mustard seeds. Nonlinear dose effects were displayed by copper nanopowders obtained by chemical synthesis with the particle size of 35-60 nm. For 45 nm nanoparticles the highest biological activity with regard to germinating energy, 3-day stem and root weight was registered at 5.0 wt ppm concentration, while for root length and weight of the 7-day stems the 1.0 wt ppm concentration had the most pronounced effect. Copper submicron powder with average particle size of 200 nm displayed some effect only after 7th day of the experiment at high concentrations (from 100 to 1000 wt ppm) according to the measurements of length and weight of the seedlings. The obtained results can be used in the development of copper nanoparticles-based preparations for pre-sowing treatment of seeds.

Influence of the size of nanostructured metals on changes in the functional state of the cell and biological activity

“…Thus, depending on their size, nanoparticles in contact with living systems can exhibit a certain biological activity and affect the metabolic processes of plants, realizing different mechanisms of their action. The physical-chemical activity of nanoparticles depends on the composition and morphology of the particles, as well as on the method of preparation [10,11], but at the same size, the nanoparticles show the same biological activity, that is, the magnitude of the response signal is uniform.…”

Síntesis de nanopartículas de hidroxiapatita y su efecto en plántulas de Raphanus sativus

“…En el presente trabajo, las partículas sintetizadas presentaron un tamaño entre 10 y 45 nm con forma de varillas alargadas principalmente, estas características posiblemente facilitaron la penetración de las HAp NPs a través del tegumento de las semillas y provocar el efecto inhibidor en la germinación y el vigor. Churilov et al (2019) reportan que al usar NPs de cobre con tamaños de partícula promedio de 45 y 200 nm encontraron que las NPs de 45 nm, tuvieron mayor actividad biológica con respecto a la energía germinativa en semillas y plántulas de mostaza blanca.…”

Copper-Containing Bionanocomposites Based on Natural Raw Arabinogalactan as Effective Vegetation Stimulators and Agents against Phytopathogens

“…For example, Cu is involved in photosynthesis, is responsible for plant resistance to bacterial and fungal diseases, is contained in copper-containing enzymes, and determines their activity [ 19 ]. Cu also plays a key role in various enzymatic reactions, photosynthetic and respiratory chains (in electron transport), cell membrane function, and protective processes against oxidative stress [ 20 , 21 ]. Modern NCs, including metal-containing particles, have increased stability to external influences, change solubility, possess higher biological activity, etc., and the synergy of the properties of the polymer matrix and metal-containing nanoparticles provides new opportunities [ 8 , 22 ].…”