MOLINA-SANTIAGO, Carlos; PEARSON, John R.; NAVARRO, Yurena; BERLANGA-CLAVERO, María Victoria; CARABALLO-RODRIGUEZ, Andrés Mauricio; PETRAS, Daniel; GARCÍA-MARTÍN, María Luisa; LAMON, Gaelle; HABERSTEIN, Birgit; CAZORLA, Francisco M.; DE VICENTE, Antonio; LOQUET, Antoine; DORRESTEIN, Pieter C.; ROMERO, Diego

doi:10.1038/s41467-019-09944

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MOLINA-SANTIAGO, Carlos

PEARSON, John R.

NAVARRO, Yurena

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Nature Communications. 2019, vol. 10, p. 1-15

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Bacteria of the generaPseudomonasandBacilluscan promote plant growth and protect plantsfrom pathogens. However, the interactions between these plant-beneficial bacteria areunderstudied. Here, we explore the interaction betweenBacillus subtilis3610 andPseudomonaschlororaphisPCL1606. We show that the extracellular matrix protectsB. subtiliscolonies frominfiltration byP. chlororaphis. The absence of extracellular matrix results in increasedfluidityand loss of structure of theB. subtiliscolony. TheP. chlororaphistype VI secretion system(T6SS) is activated upon contact withB. subtiliscells, and stimulatesB. subtilissporulation.Furthermore, wefind thatB. subtilissporulation observed prior to direct contact withP.chlororaphisis mediated by histidine kinases KinA and KinB. Finally, we demonstrate theimportance of the extracellular matrix and the T6SS in modulating the coexistence of the twospecies on melon plant leaves and seeds< Réduire

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The extracellular matrix protects Bacillus subtilis colonies from Pseudomonas invasion and modulates plant co-colonization.

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