Enantioselective phytotoxicity of the herbicide imazethapyr and its effect on rice physiology and gene transcription.

doi:10.1021/es200703v

Paper

Enantioselective phytotoxicity of the herbicide imazethapyr and its effect on rice physiology and gene transcription.

Published Jul 20, 2011 · H. Qian, Ruiqin Wang, Haijiao Hu

Environmental science & technology

Q1 SJR score

52

Citations

2

Influential Citations

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Abstract

Imazethapyr (IM) is a chiral herbicide and a widely used racemic mixture. This report investigated the enantioselectivity between R- and S-IM in rice and explored its causative mechanism at the physiological and molecular levels. The results suggested that R-IM inhibited acetolactate synthase (ALS) activity to a greater extent than S-IM, which reduced the synthesis of branched-chain amino acids (BCAAs). Additionally, most other amino acids showed enantioselectivity. On the cellular level, R-IM showed stronger toxicity against protoplasts than S-IM. A gene transcription profile analysis showed that gene transcripts in many metabolic pathways, including amino acid metabolism, photosynthesis, starch and sugar metabolism, and the tricarboxylic acid cycle displayed enantioselectivity between the IM enantiomers. R-IM regulated more genes more strongly than S-IM. This study suggested that R-IM has stronger toxicity against plants than S-IM; this toxicity is caused not only by changing targeted enzyme activity and amino acid synthesis, but also by affecting gene transcription in other metabolic pathways directly or indirectly in an enantioselective manner.

Study Snapshot

Imazethapyr (R-IM) has stronger toxicity against rice plants than S-IM, affecting enzyme activity, amino acid synthesis, and gene transcription in various metabolic pathways.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

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Enantioselective phytotoxicity of the herbicide imazethapyr and its effect on rice physiology and gene transcription.

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References

Enantioselective Phytotoxicity of the Herbicide Imazethapyr on the Response of the Antioxidant System and Starch Metabolism in Arabidopsis thaliana

The enantiomer of Imazethapyr (R-IM) more strongly retards plant growth than the enantiomer of Imazethapyr (S-IM) by causing imbalances in the antioxidant system and disrupting carbohydrate metabolism in Arabidopsis thaliana.

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Hydrogen peroxide has the greatest potential as an algaecide, as it inhibits algae growth and may reduce microcystin synthesis, while copper sulfate and N-phenyl-2-naphthylamine cause oxidative stress and damage algae cells.

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Low phosphorus stress in rice roots alters the expression of 1,518 and 2,358 genes, affecting various metabolic processes and nutrient utilization.

Proline: a multifunctional amino acid.

Proline plays a multifunctional role in plant stress response, influencing cellular homeostasis and triggering specific gene expression, potentially improving plant tolerance to environmental stresses.

Enantioselective phytotoxicity of the herbicide imazethapyr in rice.

The herbicide imazethapyr has stronger toxicity on rice growth than its enantiomer, R-()-IM, with R-()-IM showing stronger inhibition of root and shoot elongation and reduced root hair density.

Citations

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Integrated Physiological, Transcriptomic and Metabolomic Analyses of the Response of Rice to Aniline Toxicity

Higher concentrations of aniline inhibit rice growth and cause damage, with compounds like phenylpropanoids and amino acids potentially aiding rice in coping with aniline stress.

Toxicity and Glutathione S-Transferase-Catalyzed Metabolism of R-/S-Metolachlor in Rice.

S-metolachlor is more toxic to rice seedlings, blocking fatty acid synthesis, while OsGSTU1 and OsGSTU4 metabolize it with preference, affecting the whole elongation chain of (V)LCFA.

Molecular Mechanism of GmSNE3 Ubiquitin Ligase-Mediated Inhibition of Soybean Nodulation by Halosulfuron Methyl.

Halosulfuron methyl (HSM) inhibits soybean nodulation by inducing GmSNE3 and promoting the degradation of GmNSP1a, leading to a reduction in the number of nodules.

Imazethapyr disrupts plant phosphorus homeostasis and acquisition strategies.

Imazethapyr residues in soil can disrupt plant phosphorus homeostasis and acquisition strategies, causing reduced shoot development and dark purple coloration in Arabidopsis seedlings.

Joint toxicity mechanisms of perfluorooctanoic acid and sulfadiazine on submerged macrophytes and periphytic biofilms.

PFOA and sulfadiazine exposure combined significantly reduces photosynthesis and induces antioxidant responses in aquatic plants, with V. natans showing improved stress tolerance and microbial community changes.

Exogenous application of Bradyrhizobium japonicum AC20 enhances soybean tolerance to atrazine via regulating rhizosphere soil microbial community and amino acid, carbohydrate metabolism related genes expression.

Inoculation with Bradyrhizobium japonicum AC20 enhances soybean tolerance to atrazine by increasing leghemoglobin and total nitrogen, regulating amino acid and carbohydrate metabolism related genes, and increasing rhizosphere soil microbial diversity.