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H2S acting as a downstream signaling molecule of SA regulates Cd tolerance in Arabidopsis

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Abstract

Background and aims

In plants, salicylic acid (SA) acting as one of the signaling molecules can regulate and respond to cadmium (Cd) stress. It is well known that hydrogen sulfide (H2S) could alleviate toxicity of Cd stress but the crosstalk between SA and H2S in regulating Cd stress still remains unclear.

Methods

We studied on it through the physiological and biochemical method together with the microstructure synthesis.

Results

Our results indicated that the plants exhibited enhanced tolerance to Cd when pretreated with SA, which included weakening oxidative damage and intensifying photosynthesis as well as boosting L-cysteine desulfhydrase (LCD) activity and raising the content of endogenous H2S. In parallel, the plants pretreated with NaHS, a donor of H2S, showed a stronger ability to tolerate Cd stress, SA- pretreated plants presented normal growth and meanwhile the content of chlorophyll and the microstructure of roots were significantly different compared to those treated with Cd only. By contrast, with the same treatments, the positive function and effect of SA on the LCD-knockout mutants, lcd was not observed. Pharmacological experiments further testified these results.

Conclusions

All of the results suggest that H2S may be a downstream signal molecule in SA-induced Cd tolerance of Arabidopsis.

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Abbreviations

AOA:

Aminooxyacetic acid

Cd:

Cadmium

LCD:

L-cysteine desulfhydrase

HA:

Hydroxylamine

H2S:

Hydrogen sulfide

HT:

Hypotaurine

MDA:

Malondialdehyde

ROS:

Reactive oxygen species

SA:

Salicylic acid

PP:

Potassium pyruvate

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (31300236 to Zhiqiang Liu; 31372085 to Yanxi Pei and 31400237 to Zhuping Jin).

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Correspondence to Yanxi Pei.

Additional information

Responsible Editor: Juan Barcelo.

Zengjie Qiao and Tao Jing contributed equally to this work.

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Fig. S1

LCD transcriptional level (a) and the content of H2S (b) in the WT, lcd and OE-LCD plants. lcd is a T-DNA inserted knockout mutant (SAIL_793_C08/CS835466). Its gene expression at the transcriptional level and the content of H2S are dramatically down regulated compared to WT. OE-LCD is an overexpression mutant. Its LCD expression and the content of H2S are sharply up regulated (GIF 3 kb)

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Qiao, Z., Jing, T., Liu, Z. et al. H2S acting as a downstream signaling molecule of SA regulates Cd tolerance in Arabidopsis . Plant Soil 393, 137–146 (2015). https://doi.org/10.1007/s11104-015-2475-8

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