Uptake, translocation, and metabolism of thiamethoxam in soil by leek plants

Wang, Yingnan; Li, Xin; Shen, Jiatao; Lang, Hongbin; Dong, Suxia; Zhang, Luqing; Fang, Hua; Yu, Yunlong

doi:10.1016/j.envres.2022.113084

Cited by 17 publications

(5 citation statements)

References 28 publications

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“…The different physical-chemical properties of soil, plant varieties and the application mode would in uence the dissipation rate(Liu &Zhang 2020), while the half-lives were 17.3-22.4 d in sugarcane soil by trench application (Huang et al 2018), 3.7-5.3 d in wheat soil (Chen et al, 2018) and 2.9-4.8 d in cotton soil both by spraying(Liang et al, 2013) at different sites.Moreover, CLO were all below its LOQ in sugarcane and wheat soil. Wang's study showed that when TMX was applied in leek plants by root irrigation, the dissipation rate of TMX were among 8.0%-33.9% in different soils at 14 days, and very little CLO was formed(Wang et al, 2022), which was consistent with our results. Compared with CLO formation in soil, the concentrations of CLO in roots were comparably higher during the experimental period.…”

supporting

confidence: 90%

“…In greenhouse chrysanthemum, the TF of each tissue for TMX was 0.29-0.81, 0.36-2.74 and 0.30-1.03 in ower, leaf and stem, respectively, also followed the order of TF leaf > TF stem > TF ower , suggesting that chrysanthemum leaves are the main reservoir for pesticides (Gong et al 2020). In soil-leek system, the TF value increased to 1.24 ~ 2.63 in Heilongjiang, Zhejiang, Jiangsu, Shandong and Shanxi soils at the exposure time of 14 d, suggesting that TMX was prone to upward translocation and accumulation in leek shoots (Wang et al 2022).…”

Section: Tmx Dissipation and Degradation To Clo In Soil And Rootsmentioning

confidence: 95%

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Translocation and dissipation of thiamethoxam applied by root irrigation in tomato plant-soil system

Liang

Pan

et al. 2023

Environ Sci Pollut Res

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Thiamethoxam (TMX) has been registered for use on a wide range of crops due to its broad pest spectrum, high e ciency and versatile application methods. However, there is limited literature evaluating the residue behaviors of TMX applied through root irrigation. In this study, the uptake and translocation of TMX, its degradation to clothianidin (CLO) and risk assessment of TMX application in a tomato plant ecosystem were evaluated. TMX applied through root irrigation was transferable within the tomato plant, including stems, leaves and fruit at different heights. TMX concentration in the four sections of stems was ordered as C lower > C mid > C upper > C top , while in the leaves the order was the opposite and the top had the highest concentration. The degradation product CLO was detected in the tomato plant, and the concentration order was C leaf > C root > C stem > C tomato . In the leaves, the concentrations of CLO were even higher than those of TMX. The translocation factor (TF) in the same section generally followed the order of TF leaf > TF stem > TF tomato. Both long-term and short-term risks were lower than 0.44% for all the subgroups in China, which indicated that the application of TMX was comparably acceptable. This study promotes the evaluation of TMX applied through root irrigation for use in tomato ecosystems from a dietary safety perspective.

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supporting

confidence: 90%

Section: Tmx Dissipation and Degradation To Clo In Soil And Rootsmentioning

confidence: 95%

Translocation and dissipation of thiamethoxam applied by root irrigation in tomato plant-soil system

Liang

Pan

et al. 2023

Environ Sci Pollut Res

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“…Residual concentration of IMI, THI, and CLO in rice leaves was determined by previous reports with minor modifications. , Detailed methods for NI concentration determination are shown in Supporting Information Text S2.…”

Section: Materials and Methodsmentioning

confidence: 99%

Potential Toxic Mechanisms of Neonicotinoid Insecticides in Rice: Inhibiting Auxin-Mediated Signal Transduction

Zhu

et al. 2023

Environ. Sci. Technol.

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Inappropriate application of pesticides not only causes sub-lethal effects on ecosystem service providers but also reduces crop yield and quality. As a xenobiotic signal molecule, pesticides may interact with signal transduction receptors in crops, resulting in oxidative damage and even metabolic perturbations. We discovered that three neonicotinoid insecticides (NIs), namely, imidacloprid, thiamethoxam, and clothianidin, at 0.06–0.12 kg ai/ha significantly inhibited the auxin signal pathway in rice leaves, thereby reducing the intracellular auxin (IAA) content. Molecular simulation further confirmed that NIs occupied the binding site where auxin transporter-like proteins 1 (LAX11) and 2 (LAX12), in which Thr253 and Asn66 of LAX11, as well as Thr244 and Asn57 of LAX12, were bound to the nitroguanidine of NIs via H-bonds. Meanwhile, Asn66 of LAX11 and Asn57 of LAX12 interacted with nitroguanidine via aromatic H-bonds. Moreover, phenylpropanoid biosynthesis was significantly disturbed because of the inhibited auxin signal pathway. Notably, peroxidase-coding genes were downregulated with a maximum value greater than 10-fold, resulting in decreased antioxidant metabolites flavone (37.82%) and lignin content (20.15%). Ultimately, rice biomass was reduced by up to 25.41% due to the decline in IAA content and antioxidant capacity. This study deeply explored the molecular mechanism of metabolic perturbations in crops stressed by pesticides, thus providing a scientific basis for pesticide environmental risk assessment and agricultural product safety.

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“…In order to evaluate the transport capacity of prothioconazole in wheat roots, stems, and leaves, the degree of pesticide transport in wheat plants was expressed by transport factors (translocation factors, TFs), root-to-stem (TF stem/root ) and stem-to-leaf (TF leaf/stem ) [31], the calculation formula is TF stem/root = C stem /C root and TF leaf/stem = C leaf /C stem . Where C wate represents the concentration of pesticides in the nutrient solution; C root represents the concentration of pesticides in wheat roots; C stem represents pesticide concentration in wheat stems; C leaf represents the concentration of pesticides in wheat leaves.…”

Section: Data Statistics and Analysismentioning

confidence: 99%

Insights into the Fungicide Prothioconazole and Its Metabolite in Wheat: Residue Behavior and Risk Assessment

Fang,

Yan,

Zhang

et al. 2023

Agronomy

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To clarify the residue formation of prothioconazole and its main metabolite in wheat plants, the uptake, translocation, and metabolism of prothioconazole in wheat roots and leaves were investigated by nutrient solution culture and the spraying method. The results showed that prothioconazole and its metabolites showed a trend of increasing and then decreasing in wheat plants under two treatment methods, and the concentration of prothioconazole and its metabolites was higher in the high-concentration group (5000 μg/mL) than in the low-concentration group (1000 μg/mL). The transferability from stem to leaf was stronger than that from root to stem. In the nutrient solution culture, prothioconazole and its metabolites were mainly enriched in wheat roots. The concentration of prothioconazole in wheat roots increases with the increase in prothioconazole concentration and was significantly higher than the prothioconazole concentration on stems and leaves. In wheat leaves in the spraying method, prothioconazole and its metabolites were conducted from leaves to stems and roots up to the nutrient solution. Prothioconazole-desthio was detectable in wheat nutrient solution, while prothioconazole was not detected. Analysis of actual samples of 9 wheat grains and 28 flours showed that the residues of prothioconazole and its metabolites met the maximum residue limit (0.1 mg/mL) set in China and by the Codex Alimentarius Commission. The results will provide a theoretical basis for the scientific use of prothioconazole and food security assurance.

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Uptake, translocation, and metabolism of thiamethoxam in soil by leek plants

Cited by 17 publications

References 28 publications

Translocation and dissipation of thiamethoxam applied by root irrigation in tomato plant-soil system

Translocation and dissipation of thiamethoxam applied by root irrigation in tomato plant-soil system

Potential Toxic Mechanisms of Neonicotinoid Insecticides in Rice: Inhibiting Auxin-Mediated Signal Transduction

Insights into the Fungicide Prothioconazole and Its Metabolite in Wheat: Residue Behavior and Risk Assessment

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