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The nanotechnology applications in agricultural systems are multiple since they offer the potential to significantly improve plant development as well as reduce economic and environmental costs. Zinc oxide nanoparticles (NpsZnO) and other metals have been shown to have positive effects in this field. In this work, NpsZnO were synthesized and their impact on the Avena sativa plant was evaluated. The synthesis of nanoparticles (NPs) was carried out using the sol-gel method and the application of these was carried out in the seeds prior to their sowing. The results indicate that mesoporous NPs were obtained. The results indicated that the plants exposed to the application of NpsZnO had a significantly higher biomass production compared to the control treatment plants, showing values ​​of up to 0.45 (g) compared to the control that contained an average of 0.2 g an increase in the chlorophyll index was observed, obtaining concentrations up to 4 times the control. The growth-promoting effect of the applied NPs could be due to the activity of zinc as a precursor in the synthesis of auxins that promote cell division and elongation.

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The application of nanoparticles (NPs) in the field of agriculture represents a novel, efficient and low-cost alternative to replace supplies of conventional agriculture. Zinc oxide nanoparticles (NpsZnO) have been shown to have a positive effect on the development of various vegetable species. For this study, NpsZnO were synthesized by the sol-gel method, and subsequently, its absorption in Zea mays seeds and its effect on germination were evaluated. The results showed mesoporous nanoparticles were obtained. In addition, the seeds exposed to the nanoparticles showed a significantly higher concentration of zinc compared to the seeds control, showing values of up to 275 ppm compared to the control which contained an average of 75 ppm. An increase in germination was also observed, obtaining the best effect in the concentration of 16 µg/mL. The growth-promoting effect of the applied NPs on seed germination could be due to the activity of zinc as a precursor in the synthesis of phytoregulators. However, there is a lack of studies in research such as this one to confirm this inference.

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Carbon nanotubes (CNTs) have a broad range of applications and are generally considered human-engineered nanomaterials. However, carbon nanostructures have been found in ice cores and oil wells, suggesting that nature may provide appropriate conditions for CNT synthesis. During forest wildfires, materials such as turpentine and conifer tissues containing iron under high temperatures may create chemical conditions favorable for CNT generation, similar to those in synthetic methods. Here, we show evidence of naturally occurring multiwalled carbon nanotubes (MWCNTs) produced from Pinus oocarpa and Pinus pseudostrobus, following a forest wildfire. The MWCNTs showed an average of 10 walls, with internal diameters of ∼2.5 nm and outer diameters of ∼14.5 nm. To verify whether MWCNT generation during forest wildfires has a biological effect on some characteristic plant species of these ecosystems, germination and development of seedlings were conducted. Results show that the utilization of comparable synthetic MWCNTs increased seed germination rates and the development of Lupinus elegans and Eysenhardtia polystachya, two plants species found in the burned forest ecosystem. The finding provides evidence that supports the generation and possible ecological functions of MWCNTs in nature.