plant defense – mycolab.ai

Microbial-mediated induced resistance: interactive effects for improving crop health

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This research explores how beneficial microbes like Trichoderma fungi and Bacillus bacteria can help plants naturally defend themselves against diseases. These microbes trigger the plant’s built-in immune system through chemical signals and molecular processes similar to how our immune system responds to threats. The approach offers an eco-friendly alternative to chemical pesticides for protecting crops, though effectiveness varies depending on environmental conditions.

Transcriptomic changes in the PacC transcription factor deletion mutant of the plant pathogenic fungus Botrytis cinerea under acidic and neutral conditions

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Gray mold is a common fungal disease affecting many plants, and it survives by adjusting to different pH levels in plant tissues. Scientists studied a specific protein called PacC that acts like a switch controlling which genes turn on or off based on acidity levels. By comparing normal fungi to mutants without this protein, researchers identified hundreds of genes that help the fungus adapt and cause disease, offering insights into how to potentially combat this agricultural problem.

A Fungal Endophyte Alters Poplar Leaf Chemistry, Deters Insect Feeding and Shapes Insect Community Assembly

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A fungus that lives inside poplar trees helps protect them from insects by changing the tree’s chemical makeup and producing its own insect-repelling compound. Scientists found that this endophytic fungus makes poplar leaves taste worse to leaf-eating insects like gypsy moth caterpillars. However, in field conditions, the fungus unexpectedly attracts more aphids while keeping beetles and ants away, showing that endophytes can have complex effects on insect communities depending on the type of insect.

Fungal alkaloids mediate defense against bruchid beetles in field populations of an arborescent ipomoea

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Morning glory trees (Ipomoea murucoides) form beneficial relationships with fungal partners that live inside their tissues and produce toxic compounds called alkaloids. These alkaloids accumulate in the tree’s seeds and protect them from beetle damage. Trees hosting the common fungal partner Ceramothyrium produce more of the protective alkaloid swainsonine and suffer less seed damage than those with a different fungal partner, demonstrating how this natural partnership helps the plant defend its offspring.

Botrytis cinerea combines four molecular strategies to tolerate membrane-permeating plant compounds and to increase virulence

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Botrytis cinerea is a fungus that causes plant disease by overcoming plant chemical defenses called saponins. Researchers discovered that this fungus uses four different molecular strategies to survive saponin exposure: it breaks down saponins with an enzyme, modifies membrane structures to resist saponin damage, activates proteins that protect the cell membrane, and repairs membrane damage after it occurs. These findings explain how this fungus successfully infects plants protected by saponins and reveal new understanding of how microorganisms resist antimicrobial compounds.

Expression of a novel NaD1 recombinant antimicrobial peptide enhances antifungal and insecticidal activities

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Scientists created a new genetically modified tobacco plant that produces a powerful natural pest-fighting protein called NaD1. By attaching special chitin-binding components to this protein, they made it stick better to fungal pathogens and insect digestive systems. When tested, these enhanced proteins killed fungi more effectively and caused higher mortality rates in crop-damaging insects, offering a promising natural alternative to chemical pesticides.

Saponins, the Unexplored Secondary Metabolites in Plant Defense: Opportunities in Integrated Pest Management

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Plants naturally produce compounds called saponins that protect them from insects, fungi, bacteria, parasitic worms, and viruses. This review explains how saponins work as natural pest managers and discusses how plants rich in saponins, such as licorice and soapbark trees, could be used to develop environmentally friendly crop protection products instead of synthetic pesticides.

A broadly conserved fungal chorismate mutase targets the plant shikimate pathway to regulate salicylic acid production and other secondary metabolites

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Fungal pathogens produce proteins called effectors that help them infect plants. This study discovered that a fungus called Sclerotinia sclerotiorum produces an effector that enters plant cells and travels to chloroplasts. Unlike similar effectors in other fungi, this protein increases the production of salicylic acid, a plant defense hormone, while reducing other protective compounds. This creates conditions favorable for the fungus to establish infection.

Volatile Semiochemicals Emitted by Beauveria bassiana Modulate Larval Feeding Behavior and Food Choice Preference in Spodoptera frugiperda (Lepidoptera: Noctuidae)

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Researchers discovered that a beneficial fungus called Beauveria bassiana produces odorous chemicals that can discourage pest insects from eating crops. When certain strains of this fungus release their characteristic smell (particularly a compound called 3-methylbutanol), larvae of the fall armyworm pest eat less and avoid treated plants. Interestingly, the plants themselves respond by producing defensive compounds when exposed to these fungal odors. This finding suggests a new approach to pest control that harnesses the natural chemical communication between fungi, plants, and insects.

Characterization of Endoglucanase (GH9) Gene Family in Tomato and Its Expression in Response to Rhizophagus irregularis and Sclerotinia sclerotiorum

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This study examined how tomato plants regulate genes that break down and remodel cellulose in cell walls during interactions with beneficial fungi and harmful pathogens. Beneficial mycorrhizal fungi boost the expression of these genes, leading to larger leaves and better plant growth. When pathogens attack, these genes are turned down to strengthen the cell wall defense. This demonstrates how plants balance growth and defense depending on their microbial environment.

Research Keyword: plant defense