Explore the vast range of titles available.

Lower concentrations of nanoparticles (NPs) could have positive effects on plants. In the present experiment, we tested the efficacy of seed priming Egyptian roselle cultivar with aluminum oxide nanoparticles (Al2O3 NPs). Plants grown with different concentrations (0.01, 0.05, 0.1, and 0.5%) of Al2O3 NPs-primed seeds showed varied responses. An increasing impact with 0.01% Al2O3 NPs was noticed on growth traits, such as fresh weight, dry weight, shoot length, root length, and leaf area, and physio-biochemical activities like chlorophyll a, chlorophyll b, carotenoid contents, soluble sugars, protein, amino acid, proline, and the activities of defense enzymes viz-superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and ascorbate peroxidase (APX). Nevertheless, a decrease was noted in malondialdehyde (MDA) when plants were primed with 0.01% Al2O3 NPs. Seed priming with 0.05, 0.1, and 0.5% Al2O3 NPs caused the negative effects in the aforementioned parameters. The principal component analysis revealed significant correlations among the various studied parameters. Therefore, seed priming with Al2O3 NPs at 0.01% was expected to serve as an effective measure for inducing positive effect in Egyptian roselle cultivar.

In this work, Sol gel method was used to prepare polypropylene nanocomposites; some different types of the nanoparticles (clay, ZnO, SiO2 and TiO2) and different concentration (1, 5 and 10 wt%) were used to control on the attraction forces of water droplets on surfaces of polypropylene nanocomposites. The prepared polypropylene nanocomposites were characterized by FTIR, SEM, dielectric constant, contact angle, wetting energy, spreading coefficient and work of adhesion measurements. Experimental results deduced that clay and ZnO nanoparticles reduce the dielectric constant of polypropylene, while SiO2 and TiO2 increase this value. It has been reported that the wettability of the prepared nanocomposites is reduced by increasing certain nanoparticles ratio, which indicate the ability of the obtained nanocomposites for packaging and battery cases applications.

To our knowledge, little attention has been paid to evaluating ZnO nanoparticles (ZNPs) roles in plants grown under salinity stress. In this study, seeds of lupine ( Lupinus termis ) plants were grown in plastic pots and exposed to 0 (control) and 150 (S) mM NaCl with or without priming with different concentrations of ZnO [20 mg L −1 (ZNPs1), 40 mg L −1 (ZNPs2), and 60 mg L −1 (ZNPs3)] for 20 days. Salinized plants showed a reduction in plant growth parameters (root length, shoot length, fresh weight, and dry weight) and in the contents of photosynthetic pigments (chlorophyll a and b, and carotenoids) and Zn, as well as in the activity of catalase (CAT) against control plants. On the other side, salinity stress boosted the contents of organic solutes (soluble sugar, soluble protein, total free amino acids, and proline), total phenols, malondialdehyde (MDA), ascorbic acid and Na, as well as the activities of superoxide dismutase (SOD), peroxidase (POD), and ascorbate peroxidase (APX) in stressed plants over control plants. However, seed-priming with ZNPs mostly stimulated growth of stressed plants, which was accompanied by reinforcement in the levels of photosynthetic pigments, organic solutes, total phenols, ascorbic acid and Zn, as well as in the activities of SOD, CAT, POD, and APX enzymes over stressed plants alone. On the contrary, priming with ZNPs caused a decrement in the contents of MDA and Na in stressed plants relative to salinized plants alone. It is worthy to mention that, this improvement in salt tolerance of plants primed with ZNPs was more obvious in plants primed with ZNPs3 and grown both in unstressed and stressed regimes. Thus, our findings suggest that seed-priming with ZNPs, especially 60 mg L −1 ZnO is an effective strategy that can be used to enhance salt tolerance of lupine plants.

Lower concentrations of nanoparticles (NPs) could have positive effects on plants. In the present experiment, we tested the efficacy of seed priming Egyptian roselle cultivar with aluminum oxide nanoparticles ([Al.sub.2][O.sub.3] NPs). Plants grown with different concentrations (0.01, 0.05, 0.1, and 0.5%) of [Al.sub.2][O.sub.3] NPs-primed seeds showed varied responses. An increasing impact with 0.01% [Al.sub.2][O.sub.3] NPs was noticed on growth traits, such as fresh weight, dry weight, shoot length, root length, and leaf area, and physio-biochemical activities like chlorophyll a, chlorophyll b, carotenoid contents, soluble sugars, protein, amino acid, proline, and the activities of defense enzymes viz-superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and ascorbate peroxidase (APX). Nevertheless, a decrease was noted in malondialdehyde (MDA) when plants were primed with 0.01% [Al.sub.2][O.sub.3] NPs, Seed priming with 0.05, 0.1, and 0.5% [Al.sub.2][O.sub.3] NPs caused the negative effects in the aforementioned parameters. The principal component analysis revealed significant correlations among the various studied parameters. Therefore, seed priming with [Al.sub.2][O.sub.3] NPs at 0.01% was expected to serve as an effective measure for inducing positive effect in Egyptian roselle cultivar.