Sulfur Dioxide: An Emerging Signaling Molecule in Plants

Sulfur dioxide (SO ) has long been viewed as toxic gas and air pollutant, but now is being verified as a signaling molecule in mammalian cells. SO can be endogenously produced and rapidly transformed into sulfur-containing compounds (e.g., hydrogen sulfide, cysteine, methionine, glutathione, glucosi...

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Bibliographic Details
Published in:Frontiers in plant science 2022-05, Vol.13, p.891626
Main Authors: Li, Zhong-Guang, Li, Xiao-Er, Chen, Hong-Yan
Format: Article
Language:English
Subjects:
fruit fresh-keeping
Plant Science
seed germination
signaling molecule
stomatal movement
stress response
sulfur dioxide
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Summary:Sulfur dioxide (SO ) has long been viewed as toxic gas and air pollutant, but now is being verified as a signaling molecule in mammalian cells. SO can be endogenously produced and rapidly transformed into sulfur-containing compounds (e.g., hydrogen sulfide, cysteine, methionine, glutathione, glucosinolate, and phytochelatin) to maintain its homeostasis in plant cells. Exogenous application of SO in the form of gas or solution can trigger the expression of thousands of genes. The physiological functions of these genes are involved in the antioxidant defense, osmotic adjustment, and synthesis of stress proteins, secondary metabolites, and plant hormones, thus modulating numerous plant physiological processes. The modulated physiological processes by SO are implicated in seed germination, stomatal action, postharvest physiology, and plant response to environmental stresses. However, the review on the signaling role of SO in plants is little. In this review, the anabolism and catabolism of SO in plants were summarized. In addition, the signaling role of SO in seed germination, stomatal movement, fruit fresh-keeping, and plant response to environmental stresses (including drought, cold, heavy metal, and pathogen stresses) was discussed. Finally, the research direction of SO in plants is also proposed.
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2022.891626