Genetic Resistance Mechanisms in Verticillium Wilt Pathogenesis
Summary
Verticillium wilt, caused by the soil-borne fungus Verticillium dahliae, threatens a wide range of dicotyledonous crops by colonising the vascular system and triggering wilting, defoliation and yield loss. Host resistance hinges on early pathogen recognition, rapid signal transduction and deployment of both basal and effector-triggered defences. Cell-surface receptors such as receptor-like proteins (RLPs) detect pathogen-associated molecular patterns, while intracellular nucleotide-binding leucine-rich repeat receptors (NLRs) monitor effector activity. Downstream signalling involves reactive oxygen species burst, hypersensitive cell death and phytohormone-mediated transcriptional reprogramming through salicylic acid, jasmonic acid and ethylene pathways. Reinforcement of cell walls via lignification and the production of antimicrobial metabolites contribute to vascular occlusion and restriction of fungal spread. Epigenetic and post-translational modifications fine-tune defence outputs, balancing immunity with growth. Advances in genetic mapping and functional genomics have uncovered both conserved and lineage-specific resistance loci, offering targets for breeding and biotechnological engineering of resistant cultivars.
Research from Nature Portfolio
Recent studies have revealed that a cotton cytochrome P450 enzyme, CYP82D, acts as a critical regulator of systemic cell death by modulating oxylipin metabolism. Suppression of this gene causes lesion mimic phenotypes, while overexpression adjusts lipoxygenase-derived fatty acid profiles and curbs excessive hydroperoxide accumulation. This modulation of oxylipin-derived signals controls the hypersensitive response and prevents runaway cell death, illustrating how fatty acid metabolites serve as mobile defence signals that calibrate local and systemic immunity against Verticillium wilt.
Genetic Resistance Mechanisms in Verticillium Wilt Pathogenesis publication trend
The graph below shows the total number of articles in genetic resistance mechanisms in verticillium wilt pathogenesis across all publications each year (not limited to Nature Index journals).
Technical terms
Nucleotide-binding leucine-rich repeat receptor (NLR): Intracellular immune receptor that recognises pathogen effectors and initiates defence signalling.
Toll/interleukin-1 receptor (TIR) domain: Protein domain in some NLRs that mediates receptor oligomerisation and downstream signal transduction.
Lysine 2-hydroxyisobutyrylation (Khib): Post-translational modification of lysine residues influencing protein function, here implicated in chloroplast-mediated immunity.
Oxylipins: Oxygenated fatty acid derivatives that act as local or systemic signals in plant defence and cell death regulation.
Reactive oxygen species (ROS): Highly reactive molecules produced in chloroplasts or apoplast that contribute to cell wall strengthening and hypersensitive response.
References
- Lysine 2‐Hydroxyisobutyrylation‐ and Succinylation‐Based Pathways Act Inside Chloroplasts to Modulate Plant Photosynthesis and Immunity. Advanced Science (2023).
- Genome-wide association analysis reveals a novel pathway mediated by a dual-TIR domain protein for pathogen resistance in cotton. Genome Biology (2023).
- Cotton cytochrome P450 CYP82D regulates systemic cell death by modulating the octadecanoid pathway. Nature Communications (2014).
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