Maghemite Nanoparticles Acts as Nanozymes, Improving Growth and Abiotic Stress Tolerance in Brassica napus

Abstract

Yttrium doping-stabilized γ-Fe 2 O 3 nanoparticles were studied for its potential to serve as a plant fertilizer and, through enzymatic activity, support drought stress management. Levels of both hydrogen peroxide and lipid peroxidation, after drought, were reduced when γ-Fe 2 O 3 nanoparticles were delivered by irrigation in a nutrient solution to Brassica napus plants grown in soil. Hydrogen peroxide was reduced from 151 to 83 μM g −1 compared to control, and the malondialdehyde formation was reduced from 36 to 26 mM g −1 . Growth rate of leaves was enhanced from 33 to 50% growth compared to fully fertilized plants and SPAD-measurements of chlorophyll increased from 47 to 52 suggesting improved agronomic properties by use of γ-Fe 2 O 3 nanoparticles as fertilizer as compared to chelated iron.

FePO4 NPs Are an Efficient Nutritional Source for Plants: Combination of Nano-Material Properties and Metabolic Responses to Nutritional Deficiencies

“…In these investigations however the effectiveness of these compounds was appraised against non-nanomaterials having a different chemical composition from that of the NPs used ( Liu and Lal, 2014 ; Miranda-Villagómez et al, 2019a ; Miranda-Villagómez et al, 2019b ). The same is true for Fe, given that the literature available mostly compares the effects of Fe-containing NPs with other forms of the micronutrient such as FeCl 3 and Fe(III)-EDTA ( Ghafariyan et al, 2013 ; Rui et al, 2016 ; Hu et al, 2017 ; Palmqvist et al, 2017 ; Yuan et al, 2018 ). Our investigation on the other hand compares two forms (nano- and non-nano-scale) of the same salt, and the results support the idea that nutrient availability is increased when supplied in sub-micron particles.…”

“…Only few of these investigations however compare these NPs with other, more conventional sources of Fe ( e.g. FeCl 3 and Fe-EDTA), either in pot ( Palmqvist et al, 2017 ) or hydroponics experiments ( Ghafariyan et al, 2013 ; Hu et al, 2017 ). In hydroponics-grown material, the effects of γ-Fe 2 O 3 NPs on plant growth and oxidative stress were observed to depend on the concentration of the NPs ( Hu et al, 2017 ).…”

Investigating the remediation potential of iron oxide nanoparticles in Cu-polluted soil–plant systems: coupled geochemical, geophysical and biological approaches

“…56 Thus, magnNPs likely induced a protection against lipid peroxidation, which was not observed in the other treatments. The protective effect of IONPs against lipid peroxidation was recently highlighted for different plant species [58][59][60] triggering the protective antioxidant system against ROS. Oxidative stress is generally due to enhanced accumulation of ROS, particularly O 2 c À and H 2 O 2 in chloroplasts, mitochondria, and peroxisomes.…”

The Power of Being Small: Nanosized Products for Agriculture

“…Both Fe and S were bioavailable from FeS 2 NPs with synergism in greater growth and yield for several vegetables (Das et al, 2016). Similarly, maghemite NPs were more effective in Fe supply to Brassica napis than chelated iron (Palmqvist et al, 2017).…”