Streptomyces virginiae GZ2 and application thereof in plant-parasitic nematode control

By applying Virginia Streptomyces GZ2, the problems of chemical pesticide pollution and unstable efficacy of existing biocontrol agents have been solved, achieving the effect of highly effective control of various plant parasitic nematodes and promoting plant growth.

CN119752729BActive Publication Date: 2026-06-12NANJING AGRICULTURAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING AGRICULTURAL UNIVERSITY
Filing Date
2025-01-10
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing chemical pesticides pose environmental pollution and food safety threats when controlling plant parasitic nematodes. Furthermore, the types of existing biocontrol fungi and bacteria preparations are limited and their efficacy is unstable, making it difficult to effectively solve the problem of root-knot nematode infestation.

⚗Method used

The strain, *Streptomyces virginiana* GZ2, was screened from soil samples from Guiyang City, Guizhou Province. It exhibits strong insecticidal activity and plant growth-promoting properties. It is used to control southern root-knot nematodes, pine wood nematodes, rice stem nematodes, and sweet potato stem nematodes. It can also synthesize the growth stimulant indoleacetic acid and the growth-promoting substance ironophilic acid.

🎯Benefits of technology

It showed high mortality rates against a variety of plant parasitic nematodes, especially against the southern root-knot nematode, with a 48-hour corrected mortality rate of 99.3%. At the same time, it promoted plant growth, and the growth stimulant significantly improved crop growth. Its control efficacy was similar to that of the chemical nematicide thiazophos.

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Abstract

The application belongs to the technical field of biological control of plant parasitic nematodes, and particularly relates to Streptomyces virginiae GZ2 and application thereof in the control of plant parasitic nematodes, wherein the Streptomyces virginiae GZ2 is preserved in the China Center for Type Culture Collection, and the preservation number is CCTCC M 2024975. The fermentation liquor of the Streptomyces virginiae GZ2 screened by the application has strong lethal activity on various plant parasitic nematodes, and the corrected mortality rates of the fermentation liquor on southern root-knot nematode, pine wood nematode, rice dry tip nematode and sweet potato stem nematode are 88.2%, 88.8%, 88.2% and 78.3% respectively. The corrected mortality rate of the fermentation liquor on the second instar larvae of the southern root-knot nematode reaches 99.3% in 48 hours.
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