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Differential physiological responses of a biogenic silver nanoparticle and its production matrix silver nitrate in Sorghum bicolor

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Abstract

Silver nanoparticles (AgNP) have been extensively applied in different industrial areas, mainly due to their antibiotic properties. One of the environmental concerns with AgNP is its incorrect disposal, which might lead to severe environmental pollution. The interplay between AgNP and plants is receiving increasing attention. However, little is known regarding the phytotoxic effects of biogenic AgNP on terrestrial plants. This study aimed to compare the effects of a biogenic AgNP and AgNO3 in Sorghum bicolor seedlings. Seeds were germinated in increasing concentrations of a biogenic AgNP and AgNO3 (0, 10, 100, 500, and 1000 μM) in a growth chamber with controlled conditions. The establishment and development of the seedlings were evaluated for 15 days. Physiological and morpho-anatomical indicators of stress, enzymatic, and non-enzymatic antioxidants and photosynthetic yields were assessed. The results showed that both AgNP and AgNO3 disturbed germination and the establishment of sorghum seedlings. AgNO3 released more free Ag+ spontaneously compared to AgNP, promoting increased Ag+ toxicity. Furthermore, plants exposed to AgNP triggered more efficient protective mechanisms compared with plants exposed to AgNO3. Also, the topology and connectivity of the correlation-based networks were more impacted by the exposure of AgNO3 than AgNP. In conclusion, it is plausible to say that the biogenic AgNP is less toxic to sorghum than its matrix AgNO3.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

AgNP:

Silver nanoparticle

AgNO3 :

Silver nitrate

APX:

Ascorbate peroxidase

ASC:

Ascorbate

CAT:

Catalase

Chl :

Chlorophyll

ROS:

Reactive oxygen species

PPFD:

Photosynthetic photon flux density

rcf:

Relative centrifuge force

RWC:

Relative water content

TBARS:

Thiobarbituric acid-reactive substances

References

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Funding

This work was supported by grant #2018/0458-6 and #2010/50186-5, São Paulo Research Foundation (FAPESP) and grant #404707/2018-1 National Council for Scientific and Technological Development (CNPq) and also for the scholarship granted to ABSZ by CAPES.

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Authors and Affiliations

Authors

Contributions

ABSZ: conducting the experiments, analysis and interpretation of the data. CAO: conception and design, drafting the manuscript, provision of materials. CNC: analysis and data interpretation, technical support, collection and assembly data. OJGA: drafting of the article, data analysis and interpretation of morpho-anatomical analysis, AOS: critical revision of the article, obtaining of funding, provision of study materials. MCLN: conception and design, analysis and interpretation, obtaining funding, provision of materials, writing-reviewing, and editing. All authors approved the manuscript.

Corresponding author

Correspondence to Milton Costa Lima Neto.

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Competing interests

The authors declare that they have no competing interests.

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Responsible Editor: Gangrong Shi

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Supplementary information

Figure S1

Morpho-anatomical characterization (PNG 7457 kb)

Figure S2

Correlation-based network (PNG 631 kb)

Table S1

Correlation-based network parameters (DOCX 6 kb)

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Ziotti, A.B.S., Ottoni, C.A., Correa, C.N. et al. Differential physiological responses of a biogenic silver nanoparticle and its production matrix silver nitrate in Sorghum bicolor. Environ Sci Pollut Res 28, 32669–32682 (2021). https://doi.org/10.1007/s11356-021-13069-4

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  • DOI: https://doi.org/10.1007/s11356-021-13069-4

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