Abstract
The effects of zinc oxide nanoparticles on seed germination and seedling growth of Capsicum annuum L. were determined in this research. Total phenols content, total flavonoids, and condensed tannins, as well as 2,2-diphenyl-1-picrylhydrazyl (DPPH) antioxidant capacity was determined. Results indicated that treatment with zinc oxide nanoparticles (ZnO-NPs) improved seed germination rate during the first seven days. The seed vigor germination increased 123.50%, 129.40% and 94.17% by treatment with ZnO-NPs suspensions at 100, 200 and 500 ppm, respectively. The morphological parameters tested revealed that ZnO-NPs treatments did not significantly affect plumule development, but they had a significant impact (p ≤ 0.01) on radicle length. Suspensions at 100, 200 and 500 ppm of ZnO-NPs inhibited seedling radicle growth and promoted accumulation of phenolic compounds, with a phytotoxic effect in this organ. Results suggested that zinc oxide nanoparticles influence seed vigor and seedling development and promoted the accumulation of desirable phenolic compounds in the radicle.
Highlights
Nanotechnology has drawn the attention of researchers in recent years.The term “nanotechnology” may be defined as the design, synthesis, manipulation and application of atomic or molecular aggregates with a dimension between 1 and 100 nm [1]
zinc oxide (ZnO) participates in regulation of hormone metabolism: it modifies auxin levels through tryptophan biosynthesis, and it is essential for activation of several enzymes, such as superoxide dismutase and dehydrogenases [6]
The beneficial of zinc oxide nanoparticles (ZnO-NPs) during germination leads to hormone biosynthesis, especially auxins and gibberellins, effects of ZnO-NPs during germination leads to hormone biosynthesis, especially auxins and that promotes the degradation of seed reserves and increased seed vigor [24]
Summary
Nanotechnology has drawn the attention of researchers in recent years.The term “nanotechnology” may be defined as the design, synthesis, manipulation and application of atomic or molecular aggregates with a dimension between 1 and 100 nm [1]. The engineering methodology and processing that produce metallic nanoparticles (NPs) alter their physical and chemical properties, as well as their reactivity, due to its small size and high surface volume ratio [2]. This new nanomaterial technology has been applied to modern and sustainable agriculture practices as innovative synthetic pesticides and potential fertilizers in the new green revolution [3]. The seeds germination promoting action of ZnO-NPs employing various plant species have been confirmed [9]. Some authors have reported phytotoxic effects of ZnO-NPs [10]
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