Antifungal activity and function mechanisms of chitooligosaccharide against Gymnosporangium pleoporum, the pathogen causing rust in Juniperus przewalskii
Junchi Zhao , Jiahui Jiao , Taijun Fang , Hailan Li , Luchao Bai , Peiqin Li
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引用次数: 0
Abstract
Juniperus przewalskii, a keystone species in China's ecologically fragile Sanjiangyuan region, faces severe threats from Gymnosporangium pleoporum rust. This study establishes chitooligosaccharides (COS) as potent antifungal agents against G. pleoporum, dose-dependently suppressing teliospore germination and viability. Integrated physiological analyses revealed COS-induced severe membrane damage evidenced by electrolyte leakage, soluble protein efflux, SEM-confirmed structural deformities, and elevated malondialdehyde indicating lipid peroxidation. Concurrently, COS triggered oxidative catastrophe via reactive oxygen species accumulation with suppression of antioxidant enzymes, while collapsing energy metabolism through adenosine triphosphate depletion and inhibition of electron transport chain enzymes. Transcriptomics identified concentration-dependent differential expression in energy metabolism pathways (glycolysis, oxidative phosphorylation, fatty acid degradation), alongside disrupted protein synthesis and redox homeostasis. Crucially, nine viability-correlated downregulated core genes, including putative orthologs for oxidative defense and aromatic amino acid biosynthesis, exhibited lineage-specific functions. Collectively, COS acts as a multi-target antifungal agent directly disrupting membrane integrity, redox homeostasis, and energy / protein metabolism in rust fungi, distinct from plant-induced resistance. This study establishes the scientific foundation for COS deployment against J. przewalskii rust disease, highlighting its eco-compatible potential through targeted exploitation of essential pathogen vulnerabilities. Furthermore, it positions COS as a cornerstone for precision forestry therapeutics that concurrently achieve pathogen suppression and ecological integrity preservation in vulnerable montane ecosystems.
期刊介绍:
Pesticide Biochemistry and Physiology publishes original scientific articles pertaining to the mode of action of plant protection agents such as insecticides, fungicides, herbicides, and similar compounds, including nonlethal pest control agents, biosynthesis of pheromones, hormones, and plant resistance agents. Manuscripts may include a biochemical, physiological, or molecular study for an understanding of comparative toxicology or selective toxicity of both target and nontarget organisms. Particular interest will be given to studies on the molecular biology of pest control, toxicology, and pesticide resistance.
Research Areas Emphasized Include the Biochemistry and Physiology of:
• Comparative toxicity
• Mode of action
• Pathophysiology
• Plant growth regulators
• Resistance
• Other effects of pesticides on both parasites and hosts.