Dual functions of apigenin in suppressing Phytophthora capsici and shaping the pepper microbiome.
Liao X, Song W, Wan Y, Zhang J, Ren P
Soil Health
It means the peppers in your garden may already be producing their own natural defense compounds, and understanding this could lead to apigenin-based soil treatments that protect crops from root rot without pesticides.
Scientists discovered that pepper plants naturally produce a compound called apigenin in their roots, and this compound does two powerful things at once: it directly kills the spores of a fungus-like pathogen that causes root rot, and it attracts helpful bacteria and fungi in the soil that protect the plant. Pepper varieties that resisted disease kept making lots of apigenin, while vulnerable varieties stopped producing it when attacked. When researchers sprayed apigenin on susceptible plants, those plants became dramatically more resistant — cutting spore release by 95%.
Key Findings
Exogenous apigenin application reduced zoospore release from Phytophthora capsici by 95% by disrupting the pathogen's cell membrane integrity.
Susceptible pepper cultivars showed a pronounced suppression of the flavonoid biosynthesis pathway with markedly lower apigenin levels compared to resistant cultivars under pathogen challenge.
Apigenin acted as a 'hub metabolite' that selectively enriched disease-suppressive rhizosphere microbes, providing an indirect layer of host protection beyond its direct antimicrobial effect.
chevron_right Technical Summary
A natural plant compound called apigenin, found in pepper roots, fights a devastating soil pathogen while also recruiting beneficial soil microbes — offering a potential natural tool for crop protection without synthetic chemicals.
Abstract Preview
Plant resistance to soil-borne pathogens is shaped by the interactions among host genetics, root exudates, and rhizosphere microbiomes. Flavonoids are widely recognized for their antimicrobial and ...
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