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Toxics
Special Issues
Insights into the Biology of Plants Affected by Toxic Chemicals
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Insights into the Biology of Plants Affected by Toxic Chemicals

A special issue of Toxics (ISSN 2305-6304). This special issue belongs to the section "Toxicity Reduction and Environmental Remediation".

Deadline for manuscript submissions: closed (22 November 2024) | Viewed by 1739

Special Issue Editor

Prof. Dr. Xiao-Zhang Yu

E-Mail Website
Guest Editor
College of Environmental Science & Engineering, Guilin University of Technology, Guilin 541004, China
Interests: plant transport, detoxification, and storage of environmental contaminants; plant regulation strategy in response to environmental stresses; plant–microbiome interaction
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Numerous of the existing ecosystems are currently polluted by some kind of toxic chemicals, which affect plant growth and yield, and, the entrance of these toxic chemicals into the food chain is almost unavoidable. Phytoremediation techniques that incorporate new plant growth regulators are powerful and promising potential options for the remediation of these contaminated sites, either for the complete removal of these chemicals or to reduce their toxicity.

In this regard, we welcome novel insights, fundamental research, and analyses about the effects of toxic chemicals on plants for this Special Issue. Toxic chemicals include all xenobiotics, i.e., heavy metals, polyaromatic hydrocarbons, and other emerging toxic chemicals, in environmental matrices. We aim to collect papers delineating the "Toxic State" by investigating the molecular and cellular responses of plants exposed to environmental chemicals and stressors. Meanwhile, plants’ responses to these toxic chemicals and strategies to overcome the negative effects of these chemicals are also of interest.

Prof. Dr. Xiao-Zhang Yu
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Toxics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • toxic chemicals
  • toxicity in plants
  • phytoremediation
  • genetic response and regulation

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Published Papers (2 papers)

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Research

16 pages, 3973 KiB  
Article
SOS! Hydrogen Sulfide Enhances the Flavonoid Early Warning System in Rice Plants to Cope with Thiocyanate Pollution
by Peng Tian, Yu-Xi Feng and Yan-Hong Li
Toxics 2024, 12(8), 591; https://doi.org/10.3390/toxics12080591 - 14 Aug 2024
Viewed by 760
Abstract
The presence of thiocyanate (SCN−) in irrigation water has adverse effects on both plant growth and crop output. Hydrogen sulfide (H2S) is an important gaseous signaling molecule that can alleviate SCN− stress. Flavonoids are secondary compounds produced by [...] Read more.
The presence of thiocyanate (SCN−) in irrigation water has adverse effects on both plant growth and crop output. Hydrogen sulfide (H2S) is an important gaseous signaling molecule that can alleviate SCN− stress. Flavonoids are secondary compounds produced by plants and are ubiquitous in the plant kingdom. They play important roles in several physiological and biochemical processes. To investigate the effect of exogenous H2S on the growth of early rice plants under SCN− stress, we carried out a hydroponic experiment focusing on the interaction of exogenous H2S with flavonoids. In this study, a hydroponic experiment was performed to investigate the behavior of SCN− when subjected to varying effective doses (EC20: 24.0 mg/L; EC50: 96.0 mg/L; and EC75: 300.0 mg/L). The findings indicated that the relative growth rate (RGR) of the plants treated with H2S + SCN− was greater than that of the plants treated with SCN− alone. Higher amounts of flavonoids were detected in the shoots than in the roots, with more variability in the shoots. The early warning level results showed that most of the flavonoids were present at levels I and II, while quercetin was present at level IV. Genetic expression variation factor (GEVF) analyses revealed an increase in the quantity of “promoter genes” with increasing SCN− concentration in both rice tissues. Furthermore, administering external H2S while exposing rice tissues to SCN− resulted in a considerable decrease in the levels of reactive oxygen species. This study provides novel insights into the regulation of flavonoid levels in rice plants by exogenous H2S, facilitating enhanced resistance to SCN− stress and promoting sustainable agriculture. Full article
(This article belongs to the Special Issue Insights into the Biology of Plants Affected by Toxic Chemicals)
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14 pages, 2172 KiB  
Article
The Accumulation of Abscisic Acid Increases the Innate Pool of Soluble Phenolics through Polyamine Metabolism in Rice Seedlings under Hexavalent Chromium Stress
by Yi Kang, Cheng-Zhi Li, Abid Ullah, Qing Zhang and Xiao-Zhang Yu
Toxics 2024, 12(8), 577; https://doi.org/10.3390/toxics12080577 - 8 Aug 2024
Viewed by 645
Abstract
Potential toxic element (PTE) pollution has emerged as a significant environmental and social concern in global agriculture. Chromium (Cr) occurs in different oxidation states naturally, among them Cr(VI), which is highly toxic. This study carried out biochemical and molecular tests to elucidate the [...] Read more.
Potential toxic element (PTE) pollution has emerged as a significant environmental and social concern in global agriculture. Chromium (Cr) occurs in different oxidation states naturally, among them Cr(VI), which is highly toxic. This study carried out biochemical and molecular tests to elucidate the accumulation of total soluble phenolics (TSPs) in rice plants exposed to Cr(VI) at 2.0, 8.0, and 16.0 mg Cr/L, emphasizing the interaction between polyamines (PAs) and abscisic acid (ABA). The results revealed significant Cr accumulation in different tissues of rice plants, which hindered their growth. Cr(VI) exposure increased the ABA concentration, with higher levels detected in the shoots than in the roots. The TSP concentration in rice tissues showed a positive relationship with the supplied concentrations of Cr(VI). The measured PAs, including spermine (Spm), putrescine (Put), and spermidine (Spd), exhibited varied responses to Cr(VI) stress, with only Spm concentration increasing with Cr(VI) concentrations. Real-time qRT-PCR showed PAs and ABA synthesis-associated genes such as OsADC1, OsAIH, OsCPA1, and OsCPA4 were significantly up-regulated in shoot of rice plants treated with Cr(VI). These genes are associated with the second pathway of Put synthesis, originating from Arg. Almost all genes activated in the Met pathway were significantly up-regulated as well. Moreover, the genes involved in the interconversion among the three species of PAs exhibited completely different responses to Cr(VI) exposure. Overall, the biochemical analysis and gene expression data indicate that the interaction between ABA and Spm is likely to enhance the TSP levels in rice plants subjected to Cr(VI) toxicity. Full article
(This article belongs to the Special Issue Insights into the Biology of Plants Affected by Toxic Chemicals)
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