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Agronomic biofortification of zinc through nanofertilizers
Zinc (Zn) is a micronutrient required for plant’s growth and development. Zinc deficiency is ubiquitous in arable soils because availability of Zn for plant uptake is restricted in the root zone. Normally, Zn-use efficiency does not exceed 2 to 3 per cent and the major portion of added Zn gets fixed in the soil. This causes Zn deficiency in cereals and legumes growing on potentially Zn-deficient soils. The low human dietary bioavailability of Zn from plant-based diets causes its deficiency worldwideand may impair growth and immune functions. However, the zinc-based nanofertilizers have shown a great promise (Wang et al., 2016). Due to ultra-small size and high surface area to volume size ratio, Zn nanoparticles, applied either as foliar spray or root placement, can be transported efficiently in the plant system.
Researchers at the Agharkar Research Institute, Pune, Maharashtra, studied the efficacy of zinc complexed chitosan nanoparticles (Zn-CNP) and conventionally applied ZnSO4 (0.2%; 400 mg L-1 zinc) in two durum wheat genotypes (MACS 3125, an indigenous high yielding genotype and UC 1114, a genotype containing the Gpc-B1 gene). They observed that using nanofertilizers in right doses can enhance nutritional quality of wheat by increasing its zinc content. The observed grain zinc enrichment using Zn-CNP nanocarrier (~36%) and conventional ZnSO4 (~50%) were comparable, despite 10 folds less zinc (40 mgL-1) used in the former. Nanofertilizer application increased grain zinc content without affecting grain yield, protein content, spikelets per spike, thousand kernel weight, etc. Grain zinc enrichment observed in the four-year field trials on plots with varying soil zinc content was consistent, proving the utility of Zn-CNP as a novel nanofertilizer which enhanced fertilizer use efficiency (Dapkekar et al., 2018). Subbaiah et al., (2016) sprayed 25 nm ZnO nanoparticles on maize foliage and observed that the nanoparticles positively influenced plant growth, yield and Zn content in the maize grains. Notably, about 36 ppm Zn was recorded in the grains of plants sprayed with 100 ppm ZnO nanoparticles. The authors concluded that the accumulation of Zn in various plant parts depends on nanoparticle concentration, particle solubility, plant’s ability to uptake the nutrientand size and delivery of the nanoparticles. Du et al., 2019 observed that, in wheat crop, all plant organs showed increased Zn content with the increase in ZnO NPs concentrations. The concentration of Zn in wheat grains increased by 3.3 times and 2.4 times for ZnO NPs and ZnSO4 at 1000 mg kg-1 compared to control. Dimpka et al., 2017 reported that application Zno nanoparticles significantly (23%) increased grain Zn concentration in soybean. Bala et al., 2018 observed that foliar application of ZnO NPs treatments significantly affected the root, shootand grain Zn contents in rice. The lowest Zn concentration in shoot (33.32 mg kg-1), root (35.58 mg kg-1) and grain (13.61 mg kg-1) was observed in control plants, while higher Zn contents were recorded in ZnO NPs spray treatments. The highest zinc content of shoot (120.39 mg kg-1), root (89.58 mg kg-1) and grain (20.28 mg kg-1) was observed in 5.0 g L-1 foliar treatment. Prajapati et al., 2018 observed that the seed treatment of ZnO NPs @1000 ppm followed by three foliar sprays of ZnO NPs @1000 ppm at 21, 45 and 90 days after sowing in wheat crop proved to be significantly enhanced the grain (31.70 mg kg-1) and straw (85.65 mg kg-1) zinc content. Itroutwar et al., 2019 observed that application of ZnO NPs @ 50 mg L-1 in the leaves increased zinc content to 35 mg kg-1 as compared to control (23.5 mg kg-1). The results indicate that the movement of nutrients across the leaf surface has the potential to promote the efficiency of zinc foliar fertilizers. The squash plants, which were treated by iron+manganese nano oxide, recorded the highest value of zinc content in leaves. These results might be due to manganese interaction with other elements (Schmidt et al., 2016). Zinc content in the grain was higher in 500 ppm NFS (19.73 ppm) as compared to 1000 ppm BFS (18.68 ppm), whereas lowest is observed in control (16.6 ppm). The gain zinc content was 5.6 per cent higher in 500 ppm of NFS as compare to 1000 ppm of BFS. Zinc content in grain has improved in both nano and bulk treatments as compared to control, but interestingly the percent increase over control was high in nano ZnO (18%) than Bulk ZnSO4 (11%) (Poornima and Koti, 2019). Parmar Snehalbhai 2016, Studied the effect of foliar application of ZnO nanoparticles on Zn content of groundnut kernel and observed that application of ZnO NPs @ 500 ppm increased the zinc content of kernels to 52.75 mg kg-1 as compared to control (39.29 mg kg-1). Priester et al., 2012 observed that zinc concentrations increased in a dose-dependent fashion in the stem, leafand soybean pod tissues, with more than six times more Zn in the stem (126 mg kg-1), four times more in the leaf (344 mg kg-1)and nearly three times more in the soybean pod (81 mg kg-1), when comparing the high nano-ZnO treatment (0.5 g kg-1) vs. control. Application of low concentrations (<100 mg kg-1) of ZnO NPs to the soil increased Zn uptake by cucumber plant in comparison to the application of their bulk counterparts, but higher concentrations (1000 mg kg-1) inhibited plant growth (Moghaddasi et al., 2017). Davarpanah et al. (2016) tried foliar application of zinc (Zn) and boron (B) NFs on pomegranate (Punica granatum cv. Ardestani) before full bloom. It increased the leaf concentrations of both microelements and the pomegranate fruit yield. Seed priming of wheat with ZnO NPs at a concentration of 0, 25, 50, 75 and 100 ppm increased the growth characteristics, biomass and the content of Zn in roots, shoots and grains of wheat with ZnO NPs than control in a pot experiment. Zinc concentration linearly increased in shoot, root and grains than control plants. As compared to control, Zn concentration in shoots increased by 25, 43, 51, 65 per cent, in roots increased by 20, 21, 29, 43 per cent and in grains increased by 8, 35, 50 and 64 per cent, respectively. Hence, it was confirmed that nanoparticles could be a source of Zn aiming to reduce zinc deficiency in plants (Solanki and Laura, 2018).
Agronomic biofortification of iron through nanofertilizers
Iron (Fe) is an essential dietary nutrientand is important for crop growth and development. Iron is involved in chlorophyll biosynthesisand required for certain enzyme functions, notably, heme-proteins (e.g., cytochromes-found in chloroplast and mitochondria) and involved in electron transfer system. Therefore, the primary symptom of Fe deficiency is chlorosis in young plant leaves that affects normal physiological function and nutritional quality. The most abundant form of Fe in soils is ferric oxide (Fe2O3) or hematite, which is extremely insoluble; thus Fe uptake by the plant is often low. Conventionally, Fe uptake is dependent on the plant’s ability to reduce Fe3+ (ferric) to the Fe2+ (ferrous) formand remove it from the complex or chelating compound (often phyto-siderophores). Considering the food chain, Fe deficiency not only affects plant growth and development, but also leads to Fe deficiency in animals and humans. Therefore, it is important to increase the use efficiency of Fe fertilizers (Rout and Sahoo, 2015).
Rui et al., (2016) observed that, the total Fe content in the shoots and roots of peanut plants significantly increased in the EDTA-Fe and Fe2O3 Nano Particle treatments. The highest Fe content in shoots was in the 10 and 250 mg kg-1 Fe2O3 NPs treatments followed by the 1000 mg kg-1 Fe2O3 NPs and EDTA-Fe treatments. The Fe content in roots was higher in the EDTA-Fe treatment and Fe2O3 NPs treatments than in the control. Due to their Nano-effects, Nano Particles able to penetrate plant cell, which is different from the bulk Nano particles (in micrometer) and accumulate in plant tissues. Siva and Benita (2016) reported that, application of iron oxide nanoparticles significantly increased iron content of rhizome of ginger (3.5 ppm) in comparison to the rhizomes of Fe-EDTA (2.7 ppm) and control (2.5 ppm). Ghafari and Razmjoo (2013) suggested that application of 2 g L-1 nano iron oxide was more effective than other Fe sources and rates that was because nano-iron oxide had more number of particles per unit of weight and specific surface area which increased contact of fertilizer with plant leading to increase in Fe (131.66 ppm) uptake up to the extent of 42 per cent as compared to control (92.33 ppm). Hu et al., 2017 reported an increase in the iron concentration of Citrus maxima shoots when the plants were exposed to both γ-Fe2O3 NPs and Fe3+ treatment compared to controls and Fe(II)-EDTA treated plants. Sundaria et al., (2019) reported that, priming of wheat seeds with different concentrations of iron oxide nanoparticles in the range of 25-600 ppm, observed a pronounced increase in germination percentage and shoot length at 400 and 200 ppm treatment concentrations in IITR26 and WL711 genotypes, respectively. Intriguingly, the treatment concentration of 25 ppm demonstrated higher accumulation with a significant increase in grain iron contents to 45.7 Per cent in IITR26 and 26.8 per cent in WL711 genotypes, respectively.
Conflict of interest
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