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Related Experiment Video

Updated: Jul 23, 2025

Culturing and Genetically Manipulating Entomopathogenic Nematodes

Culturing and Genetically Manipulating Entomopathogenic Nematodes

Published on: March 31, 2022

Aspergillus niger produces lethal compounds against nematodes.

Ruizhe Zhang¹, Zefen Yu¹, Hexin Cui¹

¹Laboratory for Conservation and Utilization of Bio-Resources, Yunnan University, Kunming, China.

Pest Management Science

|July 13, 2023

Summary

Aspergillus niger Ym16 produces a calcium oxalate compound effective against plant-parasitic nematodes like Meloidogyne incognita. This metabolite also inhibits nematode egg hatching and promotes plant growth, offering a novel biological control solution.

Keywords:

Aspergillus niger Meloidogyne incognita Nematocidal metabolite calcium oxalate monohydrate

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Area of Science:

Agricultural Science
Microbiology
Biochemistry

Background:

Aspergillus niger is a safe, industrially relevant fungus.
Certain Aspergillus species' metabolites exhibit nematocidal properties.
Citric acid and oxalic acid are identified as key active ingredients.

Purpose of the Study:

To identify the nematocidal metabolite from Aspergillus niger Ym16.
To evaluate the efficacy of the metabolite against Meloidogyne incognita.
To assess the impact of the strain on plant growth.

Main Methods:

Fermentation of Aspergillus niger Ym16.
Isolation and characterization of the active nematocidal compound.
Bioassays to determine mortality and hatching inhibition rates against Meloidogyne incognita juveniles and eggs.

Main Results:

A calcium oxalate coordination compound was identified as the effective nematocidal metabolite.
The metabolite achieved high mortality rates (94-95%) against Meloidogyne incognita second-stage juveniles.
Significant hatching inhibition rates (86-87%) were observed for Meloidogyne incognita eggs.
Aspergillus niger Ym16 demonstrated plant growth promotion.

Conclusions:

Aspergillus niger Ym16 and its calcium oxalate metabolite are highly effective for controlling soil nematodes.
This biological agent presents a promising alternative for sustainable nematode management in agriculture.
The strain's dual action of nematode control and plant growth promotion makes it a valuable tool.