Plant-pathogen interaction

Rice varietal intercropping mediates resistance to rice blast (Magnaporthe oryzae) through core root exudates

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Growing different varieties of rice together can help protect susceptible rice plants from blast disease. When resistant and susceptible rice varieties are planted together, the resistant plants release special chemicals from their roots that help the susceptible plants fight off the fungal disease. Scientists identified four key chemicals—azelaic acid, sebacic acid, betaine, and phenyl acetate—that work together to boost the immune system of susceptible rice plants and directly kill the blast fungus.

Rhizoctonia solani Secretes RsCAP3 to Target Nb14–3–3b, Interfering with Hormone-Mediated Resistance in Tobacco

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A fungal disease that damages tobacco plants produces a protein called RsCAP3 that helps it evade plant immune defenses. This protein hijacks a plant defense regulator, causing the plant to activate the wrong defense pathway while suppressing another crucial defense mechanism. By manipulating these natural plant defenses, the fungus can infect the tobacco more easily, leading to disease.

Transcriptome sequencing reveals Vmplc1 involved in regulating the pathogenicity of Valsa Mali under low temperature induction

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Apple trees suffer from a fungal disease called Valsa canker that becomes more severe in cold weather. Scientists discovered that the fungus has a special protein called Vmplc1 that acts like a temperature sensor, telling the fungus to produce more aggressive enzymes when it’s cold. When researchers disabled this protein, the fungus lost its ability to damage apple trees during cold periods. This discovery helps explain why the disease is worse in spring and could lead to better disease management strategies.

Genome analysis of Phytophthora cactorum strains associated with crown- and leather-rot in strawberry

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Strawberry farmers face two serious diseases caused by a water-mold pathogen: crown rot that kills the whole plant and leather rot that spoils the fruit. Scientists sequenced the DNA of different disease-causing strains to understand why some strains can infect only fruit while others destroy the entire plant. They found that highly virulent strains have specific genetic changes in genes that help the pathogen escape the plant’s immune system, which could help develop better disease control strategies.

Optimization of cultural conditions for pectinase production by Diaporthe isolate Z1-1N and its pathogenicity on kiwifruit

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Researchers studied how a fungus called Diaporthe causes soft rot in kiwifruit by producing special enzymes called pectinases that break down the fruit’s cell walls. They found the best conditions for growing these enzymes in the lab: a temperature of 28°C, neutral pH around 7.5, and 2-3 days of growth. When they extracted these pure enzymes and put them on fresh kiwifruit, the enzymes caused damage equivalent to about half the damage caused by the living fungus itself, proving these enzymes are important for disease development.

Exogenous L-Arginine Enhances Pathogenicity of Alternaria alternata on Kiwifruit by Regulating Metabolisms of Nitric Oxide, Polyamines, Reactive Oxygen Species (ROS), and Cell Wall Modification

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Researchers discovered that a specific nutrient called L-arginine paradoxically makes a fungus that causes black spot on kiwifruit more dangerous at low concentrations. The fungus uses this amino acid to trigger multiple survival mechanisms including producing protective molecules and enzymes that break down plant cell walls. However, at higher concentrations, L-arginine actually inhibits the fungus, suggesting it could be used as part of a disease control strategy.

Histological Dissection of Fusarium-Banana Interaction Using a GFP-Tagged Subtropical Race 4 Strain of Fusarium oxysporum f. sp. cubense on Banana Cultivars with Differing Levels of Resistance

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Researchers used fluorescently-labeled fungal strains to visualize how banana wilt disease spreads inside banana plants. They found that resistant banana varieties can slow down the fungus by forming blockages (called tyloses) in their water-conducting vessels, though the fungus can still initially enter the plant. The study showed that the rhizome, an underground stem-like structure, is the key location where resistant plants successfully contain the fungus, which helps explain why some banana varieties are naturally more resistant to this devastating disease.

The Involvement of Glycerophospholipids in Susceptibility of Maize to Gibberella Root Rot Revealed by Comparative Metabolomics and Mass Spectrometry Imaging Joint Analysis

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Maize plants can suffer from a serious root disease called Gibberella root rot caused by a fungus. Researchers studied two types of maize—one resistant and one susceptible to this disease—and found that certain fatty compounds called lysophospholipids are more abundant in the susceptible plants. When these compounds build up, they damage plant cells and help the fungus spread. The resistant plants can break down these harmful compounds more effectively. This discovery could help plant breeders create maize varieties that resist this damaging disease.

Cell wall remodeling in a fungal pathogen is required for hyphal growth into microspaces

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Researchers discovered how fungi squeeze through tiny spaces inside plant tissues to cause disease. They found that fungi need to soften and remodel their cell walls to reduce their width and fit through spaces that are much narrower than normal fungal filaments. This ability to change shape is critical for the fungus to invade and colonize plants, ultimately causing wilting diseases in crops like tomatoes.

PcLRR-RK3, an LRR receptor kinase is required for growth and in-planta infection processes in Phytophthora capsici

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Researchers studied a specific protein called PcLRR-RK3 that helps Phytophthora capsici, a disease-causing organism, infect plants. By reducing the amount of this protein, they found that the pathogen became much weaker, could not grow as well, and could not successfully infect plants. This protein sits on the surface of the pathogen’s cells and acts like a communication tool that the organism needs to develop and cause disease.

Research Topic: Plant-pathogen interaction