biocontrol agents – Page 5

Functions of the Three Common Fungal Extracellular Membrane (CFEM) Domain-Containing Genes of Arthrobotrys flagrans in the Process of Nematode Trapping

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Researchers studied a special fungus called Arthrobotrys flagrans that traps and kills parasitic worms. They focused on three genes (AfCFEM1-3) that produce proteins important for making the sticky traps. When they removed two of these genes, the fungus became better at killing worms, while removing the third gene made it worse. The study shows these genes are crucial for the fungus to create effective sticky traps and could help develop better natural pest control products.

Bacillus subtilis ED24 Controls Fusarium culmorum in Wheat Through Bioactive Metabolite Secretion and Modulation of Rhizosphere Microbiome

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A beneficial bacteria called Bacillus subtilis ED24 was found to effectively protect wheat plants from a destructive fungal disease called Fusarium culmorum. When applied to wheat seeds, this bacteria improved seed germination and plant growth better than a commercial chemical fungicide, while also promoting helpful microorganisms in the soil around the plant roots. The bacteria works by producing special chemical compounds that kill the harmful fungus and by enriching the soil microbiome with beneficial organisms.

The Antimicrobial Extract Derived from Pseudomonas sp. HP-1 for Inhibition of Aspergillus flavus Growth and Prolongation of Maize Seed Storage

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Researchers discovered that a beneficial bacterium called Pseudomonas sp. HP-1 can produce a natural compound that effectively prevents mold contamination in stored maize seeds. The extract from this bacterium showed strong antifungal activity against Aspergillus flavus, a major cause of aflatoxin contamination in grain storage. The main protective compound was identified as phenazinecarboxylic acid, which works by damaging the cell membranes of fungal cells. This finding offers a promising eco-friendly alternative to synthetic chemical fungicides for protecting stored crops.

Chemical clues to infection: A pilot study on the differential secondary metabolite production during the life cycle of selected Cordyceps species

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This study examined two types of parasitic fungi (Cordyceps javanica and Cordyceps blackwelliae) that infect insects, comparing how they kill their hosts and what chemical compounds they produce during infection. Researchers found that each species uses different toxic molecules to infect insects, with C. javanica being more deadly and producing diverse compounds called beauveriolides. By analyzing infected insect corpses, scientists provided the first direct evidence that these toxic compounds are actually made during real infections, not just in laboratory cultures.

Exploring fungal pathogens to control the plant invasive Rubus niveus on Galapagos Island San Cristobal

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Hill raspberry is a highly invasive plant that has taken over approximately 30,000 hectares of the Galapagos Islands, threatening native plant species. Traditional control methods like manual removal and herbicide spraying are expensive and ineffective. Researchers identified five species of fungal pathogens that naturally occur on infected Hill raspberry plants and can cause disease on healthy plants, offering promise as biological control agents to suppress this invasive species.

Antifungal Volatile Organic Compounds from Talaromyces purpureogenus CEF642N: Insights from One Strain Many Compounds (OSMAC) Strategy for Controlling Verticillium dahliae in Cotton

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Scientists discovered that a beneficial fungus called Talaromyces purpureogenus can produce powerful antifungal compounds that kill cotton wilt disease. By growing this fungus on different nutrient media, researchers identified two main antifungal compounds: 3-octanol and 2-octenal. These natural compounds completely or nearly completely stopped the growth of the cotton wilt pathogen in laboratory tests, offering a promising green alternative to chemical pesticides for protecting cotton crops.

Bacillus subtilis Strain TCX1 Isolated from Ambrosia artemisiifolia: Enhancing Cucumber Growth and Biocontrol Against Cucumber Fusarium Wilt

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Scientists discovered a beneficial bacterium called Bacillus subtilis strain TCX1 that can protect cucumber plants from a devastating fungal disease called Fusarium wilt. This bacterium both kills the fungus directly through special compounds it produces and strengthens the plant’s natural immune system. Additionally, the bacterium helps cucumber plants grow better by producing growth hormones and improving nutrient absorption, making it a promising natural solution for farmers.

Isolation and Biological Control of Colletotrichum sp. Causing Anthracnosis in Theobroma cacao L. in Chiapas, Mexico

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Cacao farmers in Mexico’s Chiapas region face serious crop losses from anthracnose, a fungal disease caused by Colletotrichum. Researchers found a beneficial bacterium called Paenibacillus sp. NMA1017 that can suppress this disease as effectively as commercial fungicide alternatives. By testing this natural biocontrol agent both in the laboratory and on actual cacao farms, they demonstrated it could reduce disease occurrence from 65% down to just 12-20%, offering farmers a sustainable alternative to chemical treatments.

Bacillus velezensis CNPMS-22 as biocontrol agent of pathogenic fungi and plant growth promoter

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This research demonstrates that a beneficial bacterium called Bacillus velezensis CNPMS-22 can effectively protect maize plants from fungal diseases caused by Fusarium verticillioides. When used to treat seeds before planting, this bacterium reduced disease symptoms and increased crop yield to levels comparable with chemical fungicides. The bacteria produces natural compounds that kill harmful fungi and promote plant growth, offering a safer and more sustainable alternative to chemical pesticides.

Strain and contact-dependent metabolomic reprogramming reveals distinct interaction strategies between Laccaria bicolor and Trichoderma

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Scientists studied how two types of soil fungi interact with each other when grown together in laboratory conditions. By analyzing the chemicals these fungi produce and release, they discovered that the fungi actively communicate and compete with each other in different ways depending on how close they are to each other. The findings show that both airborne chemicals and chemicals released into the soil play important roles in how fungi recognize friends from foes, which could help improve the use of beneficial fungi in agriculture.

Research Topic: biocontrol agents