Publications by authors named "G Petti"

The ability of plants to perceive and react to biotic and abiotic stresses is critical for their health. We recently identified a core set of genes consistently induced by members of the leaf microbiota, termed general non-self response (GNSR) genes. Here we show that GNSR components conversely impact leaf microbiota composition.

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Rosellinia necatrix is a prevalent soil-borne plant-pathogenic fungus that is the causal agent of white root rot disease in a broad range of host plants. The limited availability of genomic resources for R. necatrix has complicated a thorough understanding of its infection biology.

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In healthy plants, the innate immune system contributes to maintenance of microbiota homoeostasis, while disease can be associated with microbiome perturbation or dysbiosis, and enrichment of opportunistic plant pathogens like Xanthomonas. It is currently unclear whether the microbiota change occurs independently of the opportunistic pathogens or is caused by the latter. Here we tested if protein export through the type-2 secretion system (T2SS) by Xanthomonas causes microbiome dysbiosis in Arabidopsis thaliana in immunocompromised plants.

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Article Synopsis
  • Plant pathogens use effector proteins to invade host plants, and plants have evolved immune receptors to recognize and counteract these effectors.
  • The soil-borne fungus Verticillium dahliae employs the effector VdAve1 to alter the plant microbiota and promote disease, especially in the absence of the immune receptor Ve1.
  • A newly identified gene, VdAve1-like, shows significant variation that helps V. dahliae evade plant defenses, while its variant VdAve1L2 exhibits antimicrobial properties, suggesting new approaches for controlling plant pathogens.
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Microbes typically secrete a plethora of molecules to promote niche colonization. Soil-dwelling microbes are well-known producers of antimicrobials that are exploited to outcompete microbial coinhabitants. Also, plant pathogenic microbes secrete a diversity of molecules into their environment for niche establishment.

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