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Recently, the Soil Pest Control Innovation Team of the Institute of Plant Protection, Chinese Academy of Agricultural Sciences, published online in the internationally renowned journal “Journal of Hazardous Materials” titled “Transcriptome reveals the toxicity difference of dimethyl disulfide by contact and fumigation on Meloidogyne incognita through calcium channel -mediated oxidative phosphorylation” research paper. This paper analyzes the biochemical and molecular mechanisms of the difference in biological activity of the soil fumigant dimethyl disulfide (DMDS) against root-knot nematodes under two different modes of action: contact killing and fumigation, and provides information for the scientific and efficient application of the new fumigant DMDS new ideas.
The prevention and control of root-knot nematode diseases in soil is a worldwide problem, and chemical nematicides have played a positive role in the prevention and control of crop nematode diseases. Soil fumigants are widely used to control soil pests due to their stable effects and efficient use. DMDS is a new type of soil fumigant, which is environmentally friendly and has broad application prospects. Since there are some differences in the way fumigants and traditional contact agents act on target organisms, this study explored the specific effects of DMDS on nematodes from the two perspectives of contact killing and fumigation, taking the difference in the toxicity of DMDS to nematodes as an entry point. Mechanism.
The study comprehensively revealed that the agent enters the target organism root-knot nematode through different ways under two modes of action: fumigation and contact killing, damages the structure of different parts of the nematode, interferes with calcium ion channels in different structures, and affects different complexes of oxidative phosphorylation in respiration. . In the contact killing mode, DMDS directly penetrates into the nematode’s body through the body wall, destroys the body wall and muscle physiological structure of the nematode, acts as an uncoupling agent, interferes with ATP synthase, and stimulates the nematode’s respiration. In the fumigation method, DMDS enters the nematode body through the olfactory perception-oxygen exchange process, and finally acts on the respiratory electron transport chain complex IV or complex I, superimposing with oxidative damage, causing the death of the nematode. This study helps guide the use of fumigants more safely, scientifically and efficiently, and also enriches the theory of fumigant action mechanisms.
The Institute of Plant Protection of the Chinese Academy of Agricultural Sciences is the unit that completed the paper. Wang Qing, a graduate student, is the first author of the paper, and associate researcher Yan Dongdong is the corresponding author. Researcher Cao Aocheng, researcher Wang Qiuxia and others provided guidance on the research work. This research work was funded by the National Natural Science Foundation of China and the National Key Research and Development Program.

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