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Effect of exogenous silicon and methyl jasmonate on the alleviation of cadmium-induced phytotoxicity in tomato plants

Abstract

In the present study, a hydroponic experiment was performed to evaluate the effect of exogenous silicon (Si) and methyl jasmonate (MeJA) on the mitigation of Cd toxicity in tomato seedlings. The results revealed that Cd-stressed plants exhibited growth inhibition, increased lipid peroxidation, and impaired photosynthetic pigment accumulation. However, Si and MeJA applied alone or in combination significantly ameliorated the above-mentioned adverse effects induced by Cd. Among all treatments, Cd+Si+MeJA treatment elevated the dry mass of roots, stems, and leaves by 317.39%, 110.85%, and 119.71%, respectively. The chlorophyll a, chlorophyll b, and carotenoid contents in Cd+Si+MeJA-treated group were dramatically elevated (p < 0.05). Meanwhile, the malondialdehyde content in roots and shoots were reduced by 32.24% and 69.94%, respectively. The Si and MeJA applied separately or in combination also resulted in a prominent decrease of Cd influxes in tomato roots; therefore, a reduction of Cd content in tomato tissues were detected, and the Cd concentration in tomato roots were decreased by 27.19%, 25.18%, and 17.51% in Cd+Si, Cd+MeJA and Cd+Si+MeJA-treated plants, respectively. Moreover, in Cd+Si+MeJA-treated group, the percentage of Cd in cell wall fraction was enhanced while that in organelle fraction was decreased as compared with Cd-stressed plants. Collectively, our findings indicated that Si and MeJA application provide a beneficial role in enhancing Cd tolerance and reducing Cd uptake in tomato plants.

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Data availability

The datasets used in the current study are available from the corresponding author on reasonable request.

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Acknowledgments

This research was financially supported by the National Natural Science Foundation of China (41807123) and Natural Science Foundation of Shaanxi Province (2020JQ-718).

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WT and GJK designed the experiment. LX and YN performed the experiments and analyzed the data. YN and HL reviewed the manuscript. SYN, LH, and RXH have provided technical assistance.

Corresponding authors

Correspondence to Ting Wei or Junkang Guo.

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The authors declare no competing interests.

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Highlights

• Exogenous Si and MeJA restored Cd-induced growth inhibition in tomato plants

• Exogenous Si and MeJA elevated chlorophyll and carotenoid contents in Cd-stressed tomato plants

• Exogenous Si and MeJA alleviated lipid peroxidation in Cd-stressed tomato plants

• Application of Si and MeJA reduced net Cd2+ fluxes into tomato roots and decreased Cd content in different tomato organs

• Exogenous Si and MeJA modulated subcellular localization of Cd in both roots and shoots of tomato plants

Responsible Editor: Gangrong Shi

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Wei, T., Li, X., Yashir, N. et al. Effect of exogenous silicon and methyl jasmonate on the alleviation of cadmium-induced phytotoxicity in tomato plants. Environ Sci Pollut Res 28, 51854–51864 (2021). https://doi.org/10.1007/s11356-021-14252-3

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  • DOI: https://doi.org/10.1007/s11356-021-14252-3

Keywords

  • Cadmium toxicity
  • Methyl jasmonate
  • Silicon,·Phtosynthetic pigment,·Cadmium flux
  • Subcellular distribution