Summary
<i>Phytophthora capsici</i> causes devastating losses in global pepper production. This study deciphers a sophisticated plant-microbe-metabolite collaboration initiated by rhizosphere-colonizing <i>Streptomyces</i>. We demonstrate that <i>Streptomyces</i> specifically primes pepper root biosynthesis of 6-nitrocoumarin, a nitrated coumarin derivative exhibiting potent broad-spectrum antioomycete activity (EC<sub>50</sub>: <i>P. capsici</i> 44.39 mg/L, <i>Phytophthora palmivora</i> 47.06 mg/L, <i>Peronophythora litchii</i> 34.92 mg/L). Crucially, this <i>Streptomyces</i>-recruited metabolite functions as a keystone rhizosphere signal, selectively enriching beneficial bacterial consortia while directly disrupting the ABC transporters of pathogens. The restructured microbiome synergistically a
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