Publications by authors named "Christine M Kraus"

Race 1 strains of pv. , which cause bacterial speck disease of tomato, are becoming increasingly common and no simply inherited genetic resistance to such strains is known. We discovered that a locus in , termed (), confers resistance to race 1 pv.

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Background: All animals have mechanisms for healing damage to the epithelial sheets that cover the body and line internal cavities. Epithelial wounds heal either by cells crawling over the wound gap, by contraction of a super-cellular actin cable ("purse string") that surrounds the wound, or some combination of the two mechanisms. Both cell crawling and purse string closure of epithelial wounds are widely observed across vertebrates and invertebrates, suggesting early evolution of these mechanisms.

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Bacterial speck disease, caused by Pseudomonas syringae pv. tomato, is a persistent problem for fresh-market tomato growers in New York. Race 0 strains of this pathogen express either or both of the type III effectors AvrPto or AvrPtoB, which are recognized by tomato varieties expressing the Pto resistance gene.

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Article Synopsis
  • Researchers found that the Pti1 kinase plays a key role in pattern-triggered immunity (PTI) against a bacterial pathogen, Pseudomonas syringae pv. tomato, in tomatoes.
  • They created transgenic tomato plants with reduced Pti1 gene expression and observed that these plants experienced worse diseases and higher bacterial levels after infection compared to normal plants.
  • Furthermore, by introducing synthetic versions of the Pti1 genes, they restored the ability of the modified plants to produce standard levels of reactive oxygen species (ROS), indicating Pti1’s role occurs early in the plant's immune response.
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Background: The plant plasma membrane is a key battleground in the war between plants and their pathogens. Plants detect the presence of pathogens at the plasma membrane using sensor proteins, many of which are targeted to this lipophilic locale by way of fatty acid modifications. Pathogens secrete effector proteins into the plant cell to suppress the plant's defense mechanisms.

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Article Synopsis
  • The Pto protein kinase from Solanum pimpinellifolium interacts with Pseudomonas syringae effectors AvrPto and AvrPtoB, triggering immune responses in plants.
  • Research on different wild tomato species, especially Solanum chmielewskii, showed some accessions only recognize AvrPtoB, revealing genetic differences in the Pto protein.
  • The study identified that a single amino acid change (histidine-to-aspartate at position 193) is crucial for recognizing AvrPto, highlighting the importance of specific residues in immune response mechanisms against pathogens.
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