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Exogenous application of NaBiF4 nanoparticle affects wheat root development

Abstract

Background

Nanoparticle causes soil pollution, which affected plant development and then resulted in biomass decreased, especially in crops. However, little is known how sodium nanoparticles affect wheat root development at plant physiological level.

Results

We used NaBiF4 (size of 50–100 nm) to analyze the effect in wheat development at plant physiological level. Under exogenous application of 50 μM NaBiF4 for treatment, wheat root elongation was inhibited, but fresh weight and dry weight were increased. We also found that NaBiF4 induced that the plant had lower content of sodium than negative control. Used no-sodium nanoparticle of BiF3 for another negative control, it was also supported that NaBiF4 entered into cell to replace of sodium and exported sodium out of plant. These results implied NaBiF4 might induce sodium export to maintain the balance between sodium and potassium elements. Additionally, metabolism analysis demonstrated that SOD activity was increased, but CAT and POD activity reduced under exogenous treatment of NaBiF4 nanoparticles.

Conclusions

Sodium nanoparticles (NaBiF4) inhibited plant development by nanoparticle accumulation and sodium homeostasis broken, and then involved reactive oxygen species (ROS) signaling system response. These results provided more sights of sodium nanoparticle effect in plant development.

Background

In the past several decades, the world’s population has been increased year by year. And cereal production similarly increased from 1.2 billion tons in 1969 to 2.8 billion tons in 2014 (FAOSTAT 1. data). Environmental factors play an essential role in crop plants development, such as temperature, light, drought, soil quality, nutrition, nanoparticles and so on. Environmental pollution, especially in soil, caused the crops production reduced due to affect root activity and impeded substance transport activity.

Many nanoparticles contribute to their promising suitability for solar cells, drug delivery, temperature sensors, indoor illumination, and field emission displays. Once nanoparticle is taken in through root pathway, it resulted in beneficial or opposite effect in plant development. Until now, several nanoparticles have been reported on the interactions with the plants, including carbonaceous nanomaterials (fullerenes and nanotubes), metal oxides, zero-valent metals, nanopolymers, QDs and other NPs (Ni(OH)2 and NaYF4) [1,2,3,4,5,6,7,8]. Actually, nanoparticles are different with nutrition, which are assimilated by root as anion or cation type. Base on the nanoparticle physical characteristic of composition, size, concentration and coating of nanoparticle, it plays different roles. To some degree, high concentrations or low concentrations of nanoparticles have opposite functions in plant development, as inhibited or promoted plants, respectively. Nevertheless, magnetic Fe3O4 even at the concentration of 2 mM does not cause serious injury in pumpkin (Cucurbita maxima) [9]. These positive effects of nanomaterials on plants were mainly reported for Au or Ag nanoparticles, Cu nanoparticles, Al related nanoparticles, TiO2 nanoparticles, CeO2 nanoparticles, SiO2 nanoparticles and carbonnanotubes [10,11,12,13,14,15].

Always, most of high concentrations of the nanoparticles caused phytotoxicity by toxic ions, cell or tissue damage, production of excess ROS, catalytic reactions [16,17,18,19,20]. To detect nanoparticles in the plant tissues, there are several different detection mechanisms of nanoparticles, such as fluorescence signaling, QDs, in situ analysis, nanoparticles color and so on [21]. Until now, little is known how nanoparticle affects crop plant development at metabolism level.

Wheat (Triticum aestivum L.) is one of the most important crop plants in the world, which supports the 1/3 of the food for human. Previously, it was reported that TiO2 nanoparticles with diameters ranging from 14 nm to 655 nm, were accumulated in wheat root. And TiO2 nanoparticles did not affect wheat seed germination, biomass and transpiration [22]. As the nanoparticles enter into plant cell, there are several different pathways for transport, such as: vascular system, membrane system, plasmodesmata system and so on. Base on the size of pathway in vascular, membrane, plasmodesmata or other system, we found nanoparticle size from 50 to 100 nm only depended on membrane. Previously, we used NaBiF4 and BiF3 for analysis the roles in rice root development [23, 24]. We found that NaBiF4 inhibited rice root elongation, but promoted more crown root formation. We analyzed several ROS signaling genes, which displayed transcript level of OsOVP1, OsNIP2:1, and OsMT2 was reduced, but expression of OsMT2b increased [24]. Exogenous application of nanoparticle of BiF3for treatment, which did not reduce rice root elongation, but not mediate OsOVP1, OsNIP2:1, OsMT2, and OsMT2b transcript level changed [23]. Because the composition of these two nanoparticles, only one element (sodium) shows difference, which might interrupt the native balance system, for example, homeostasis of sodium-potassium balance.

Plants generally maintain a stable K+/Na+ ratio and a negative electrical membrane potential difference across the plasma membrane under a normal physiological state. Na+ enters into the roots through different channels and transporters [25]. However, if the balance was broken, plant may start ROS response reactions. In this study, we found that wheat root was much more sensitive to NaBiF4 nanoparticles than BiF3 nanoparticles in root development, which caused the balance of sodium potassium pump affected.

Results

Effect of nanoparticles on the wheat root development

To analyze the effect of synthesized nanoparticles in wheat root development, wild type (WT) (Triticumaestivum L cultivar Yangmai 13) were grown in MS medium without sucrose (MS0), but with multiple concentrations of NaBiF4 nanoparticles. The images of the cultivated wheat were shown at 10 days after germination (DAG) in Fig. 1a. As demonstrated, the development of wheat root was significantly reduced by the 50 μM concentration of nanoparticles. Clearly, compared with that of the wheat grown on MS0 medium without nanoparticles as a negative control (Mock), the elongation speed of primary roots was much slower for the seedlings treated with 50 μM concentration of NaBiF4 nanoparticles (WT-HT) (Fig. 1b). And the length of WT-HT root reduced about 57.14%. Nevertheless, when the concentration of nanoparticles was declined to as low as 20 μM (WT-LT), the length of the primary roots was not significantly changed compared with the Mock (Fig. 1a-b). When the seedlings plants were treated with high concentration of NaBiF4 nanoparticles, the fresh weight and dry weight were measured. Interestingly, although the primary root elongation was inhibited, the fresh weight and dry weight were increased up to 131.25 and 130%, respectively (Fig. 1c-d). Here, we also used BiF3 nanoparticles as another controls, these data indicated that 50 μM NaBiF4 nanoparticles induced wheat biomass accumulation.

Fig. 1
figure1

Effect of NaBiF4 nanoparticle in wheat development at seedling stage. a Images of wheat plants grown in MS0 medium with various concentrations of NaBiF4 nanoparticles at 10 DAG. Bar = 1 cm. b Primary root length as a function of DAG. c Fresh weight treated with different NaBiF4 nanoparticles at 10 DAG. d Dry weight treated with different NaBiF4 nanoparticles at 10 DAG. Error bars represent standard error for at least 5 samples. Values in the same column with different letters are significantly different (P < 0.05)

Nanoparticles caused sodium export from wheat seedling plant

Previously, we reported that NaBiF4 nanoparticles caused rice root elongation inhibited due to phytotoxicity [24]. Eu acts as one type of earth element, which was visualized as red emission in the RFP channel. And, the NaBiF4:Eu3+ nanoparticles not only emitted dazzling visible red emission under the NUV excitation but also exhibited similar characteristic as the NaBiF4 nanoparticles in rice [24]. To get deep insight into the location of the nanoparticles, the cross section of root tip further confirmed that the NaBiF4:Eu3+ nanoparticles were distributed in the cells (Fig. 2a-c). Similarly, the negative results did not have any obvious signals in the wheat root grown in the MS0 medium (Fig. 2d-f). These results demonstrated that nanoparticles were accumulated in root tip. These results were similar with in rice, as the previous reported (Du et al., 2018).

Fig. 2
figure2

Cross section images of the wheat root tip treated with50 μM NaBiF4:Eu3+ nanoparticles at 4 DAG: a Bright channel, b RFP channel and c merged channel. Cross section images of the wheat root tip cultivated in MS0 medium without nanoparticles at 4 DAG: d Bright channel, e RFP channel and f merged channel. Bar = 50 μm

Multiple factors affect ROS signaling response by phytotoxicity, such as sodium stress, nutrition transport disrupt, and so on. To further understand the mechanism by nanoparticles treatment, we measured sodium concentration. We found wheat seedling by 50 μM NaBiF4 nanoparticles treatment had lower level of sodium (71.874%) than Mock, but 20 μM NaBiF4 nanoparticles treatment was not significant changed (Fig. 3a). Here, we used potassium content for negative control, which demonstrated that there were no obvious changed (Fig. 3b) in these three groups. It implied that NaBiF4 nanoparticles entered into cell resulted in less sodium in cell. Meanwhile, NaBiF4 nanoparticles induced sodium export from cell.

Fig. 3
figure3

Sodium and potassium concentration of NaBiF4 nanoparticle treatment in wheat development. a Sodium concentration under different NaBiF4 nanoparticles treatment. b Potassium concentration under different NaBiF4 nanoparticles treatment. Error bars represent standard error for at least 5 samples. 20 μM NaBiF4 (20 μM).50 μM NaBiF4 (50 μM). Values in the same column with different letters are significantly different (P < 0.05)

To further confirm this hypothesis, we used 50 μM NaBiF4 nanoparticles treatment for the similar experiments. And the solution used water to instead of MS0 medium in case sodium contamination from MS0 medium. With the treatment of NaBiF4 nanoparticles, sodium concentration was decreased about 81.39% compare with negative control. Also, we measured the sodium content in left solutions, sodium under NaBiF4 nanoparticles treatment had more than WT-CK (137.5%). And we also measured potassium concentration that there was no affected in Fig. 4b-d. This stated clearly that NaBiF4 nanoparticle caused extra sodium export out of plant into solution.

Fig. 4
figure4

Sodium and Potassium concentration of NaBiF4 and BiF3 nanoparticle treatment in wheat development. a Sodium concentration under different NaBiF4 nanoparticles treatment in wheat. b Potassium concentration under different NaBiF4 nanoparticles treatment wheat. c Sodium concentration under different NaBiF4 nanoparticles treatment export from cell into water. d Potassium concentration under different NaBiF4 nanoparticles treatment export from cell into water. Error bars represent standard error for at least 5 samples. Values in the same column with different letters are significantly different (P < 0.05)

Additional, this phenotype might due to Bismuth (Bi) or Fluorine (F). we chose another nanoparticle BiF3 for synchronization. Exogenous application of 50 μM nanoparticle BiF3, which does not have sodium, did not inhibit root elongation in rice (Du et al., 2018a), as well as in wheat (Fig. 1). Also, with 50 μM BiF3 nanoparticles for treatment, sodium and potassium concentrations in plant were not affected in plant and export solutions (Fig. 4a-b). It further demonstrated that NaBiF4 displaced the sodium in cell to maintain the balance of sodium and potassium.

ROS metabolism due to nanoparticles

As deduced above, less sodium and much NaBiF4 nanoparticles entered into plant cells, which might affect cell metabolism reaction (phytotoxicity). This reaction includes two parts: affect sodium content, and xenobiotic substance, which induced by the nanoparticles might be the main factor to affect the development of the wheat roots. To response the phytotoxicity, several ROS system metabolism could be response to the wheat root, such as the superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) [11]. To better comprehend the nanoparticles induced phytotoxicity in the wheat root, the activity level of SOD, CAT, POD to several phytotoxicity related metabolism were analyzed in Fig. 5a-c. Compared with Mock, the activity of the SOD was much higher in these wheat roots treated with the NaBiF4 nanoparticles (50 μM), as well as treated with the BiF3 nanoparticles (50 μM). Noted that, with the treatment of the resultant nanoparticles, the activity level of the CAT and POD were reduced (Fig. 5b-c). Since the nanoparticles treated to the seedlings exhibited higher activity of SOD, and then lower activity of CAT and POD involved, it were expected to response to ROS system.

Fig. 5
figure5

SOD, CAT, and POD Activity under NaBiF4 and BiF3 nanoparticle treatment in wheat development. a SOD activity level; b CAT activity level; c POD activity level; Error bars represent standard error for at least 5 samples. Values in the same column with different letters are significantly different (P < 0.05)

Discussion

As the industry development, soil contaminated day by day due to heavy metal, salinization, nanoparticles accumulation. Previously, we used multiple concentrations of NaBiF4 and BiF3 for exogenous application to another crop plant (rice) for treatment. These results demonstrated that high content (100 μM) of NaBiF4 caused toxicity by the root length reduced and more crown root number. For the particles location, it is accumulated at division and elongation zone. Further phytotoxicity related genes, transcript level of OsOVP1, OsNIP2;1, and OsMT2 was reduced and OsMT2b increased [24]. Similar content ofBiF3 exogenous treatment with NaBiF4 to rice did not show any obvious phenotype, although BiF3 also located at root tip, as NaBiF4 [23]. It implied that NaBiF4 and BiF3 have significant and different roles in plant development. In this study, we reported that same unsoluble nanoparticles, NaBiF4 and BiF3, which affected wheat development similar with in rice. Exogenous application of 50 μM NaBiF4 caused root length decreased, but BiF3 not. Interestingly, higher activity of SOD and lower of POD by the treatments of NaBiF4 and BiF3 nanoparticles, reduced CAT activity by NaBiF4, which demonstrated that both NaBiF4 and BiF3 affected ROS response reaction by tissue or cell abnormal in wheat root. Previously, Wang reported that nanoparticles caused phytotoxicity might due to (i) the dissolution and release of toxic ions; (ii) size- or shape-dependent mechanical damage and clogging; (iii) the production of excess ROS; (iv) binding interactions caused surface reconstruction of biological molecular structures; (v) oxidation of biomolecules through catalytic reactions [21]. Compare with BiF3 nanoparticles, NaBiF4 has one more element of sodium. We found less sodium concentration in plant than control, as well as used BiF3 treatment for negative control. Meanwhile, the reduced the sodium exported from the tissue into the solutions. It means that NaBiF4 play as sodium might cause sodium and potassium balance, BiF3 acts as one type of the exogenous substance, which might due to tissue damage and pathway clogging [21]. These results, above, indicated that NaBiF4 nanoparticles resulted in wheat root toxicity both in NaBiF4 accumulation in root and sodium export out of plant, as depicted as Fig. 6a. And BiF3 nanoparticles can also induce ROS signaling response only in BiF3 accumulation in root (Fig. 6b).

Fig. 6
figure6

Model of reaction under NaBiF4 and BiF3 nanoparticle treatment in wheat development. a-b As NaBiF4 enters, sodium exported out of the cell; but BiF3 did not cause this phenotype

Conclusion

Previously, we found that NaBiF4 accumulated at rice root elongation zone, and then induced ROS system signaling response by several genes transcript level affected, such as, OsOVP1,OsNIP2;1,OsMT2, and OsMT2b. Here, we used another crop plant, wheat, to further analyze these phytotoxicity reactions from plant physiological level. As the root assimilated NaBiF4 nanoparticle into cell, stable sodium from nanoparticle caused sodium export from root cell and then move into growth solution. Due to nanoparticle accumulation and less floating sodium level for plant physiological reaction, ROS related metabolism reactions were induced, which generated higher activity of SOD, and then lower activity of CAT, and POD. In the future, we will further analyze how nanoparticles move into cell.

Methods

Plant materials

The wheat cultivars selected in this study was Wheat (Triticum aestivum L. ‘Ningmai13’), which were provided by the Lixiahe Agricultural Research Institute.

Synthesis of NaBiF4 and BiF3 nanoparticles

High-purity powders of NaNO3, Bi(NO3)3·5H2O, and NH4F acted as the raw materials to prepare the nanoparticles [23]. To prepare the NaBiF4 nanoparticles, two solutions were prepared. BiF3, NaBiF4 BiF3:Eu3+ and NaBiF4:Eu3+ were synthesized previous reported [23, 24].

Determination of K+ and Na+ concentrations

The K+ and Na+ concentrations were measured as described previously [26,27,28].

SOD, CAT, POD assay

The activities of SOD, CAT, and POD activity of wheat root was measured as described previously [29, 30].4 day after germination, the seedling wheat plants were move to 50 μM NaBiF4and BiF3 nanoparticles water solution for 3 days. About 100 mg of mixed material were harvested and ground in liquid nitrogen to a fine powder and then homogenized in 5 ml 10 mM PBS (pH 7.0) containing 1% PVP (w/v), 1 mM PMSF, 0.1% Triton-X100 (w/v) and 0.1 mM EDTA. The extraction was performed at 4 °C. After centrifugation at 12,000 g for 20 min, the supernatant solution was used as the preparation for individual enzyme activity. Then SOD and CAT activity were measured by spectrophotometer at 560 nm and 240 nm, respectively. The adrenochrome formation in the next 3 min was recorded at 470 nm in a UV–V is spectrophotometer.

Statistical analysis

The experimental data was performed using t-test at a probability significance level of P < 0.05 in SPSS.

Availability of data and materials

All data generated or analyzed during this study are included in this manuscript.

Abbreviations

ROS:

Reactive oxygen species

SOD:

Superoxide dismutase

CAT:

Catalase

POD:

Peroxidase

OsMT1:

Metallothionein 1

OsMT2:

Metallothionein 2

OsOVP1:

Vacuolar H+-translocating inorganic pyrophosphatase

OsNIP2:

1: nodulin 26-like intrinsic protein

OsMT2b:

Metallothionein2b

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Acknowledgments

We thank Peng Du in Ningbo University for providing the NaBiF4 and BiF3nanoparticles, as well as the Lixiahe Agricultural Research Institute provided wheat cultivar Yangmai 13(Yangzhou, China) in this project.

Funding

This study was supported by the Natural Science Foundation of China(31571573, 31701351), the Natural Science Foundation of Jiangsu Province (Grant BK20190889), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 19KJB180033),the Project funded by China Postdoctoral Science Foundation (2019 M660130),“LvyangJinfeng” talents attracting plan, the Talent Support Program of Yangzhou University, and Yangzhou University Postdoctoral Science Foundation, a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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FX and YFW designed research; YFW, WMH P, QQJ performed the experiments; YFW wrote manuscript; FX, YFW, GC, QQJ, WMH P, ZDD, YRX corrected manuscript. All authors have read and approved the manuscript.

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Correspondence to Gang Chen or Fei Xiong.

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Wu, Y., Peng, W., Dong, Z. et al. Exogenous application of NaBiF4 nanoparticle affects wheat root development. BMC Plant Biol 20, 140 (2020). https://0-doi-org.brum.beds.ac.uk/10.1186/s12870-020-02348-w

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Keywords

  • Wheat
  • Root
  • Development
  • Nanoparticle
  • NaBiF4
  • Sodium
  • Homeostasis