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ARS Home » Northeast Area » Ithaca, New York » Robert W. Holley Center for Agriculture & Health » Emerging Pests and Pathogens Research » Research » Research Project #432528

Research Project: Characterization of Molecular Networks in Diseases Caused by Emerging and Persistent Bacterial Plant Pathogens

Location: Emerging Pests and Pathogens Research

2021 Annual Report


Accomplishments
1. Identification of IAA-regulated genes in Pseudomonas syringae pv. tomato strain DC3000. Indole 3 acetic acid (IAA), a common form of the plant hormone auxin, is used by many plant-associated bacteria, including plant pathogens, as an environmental cue to sense the plant environment. However, the mechanisms by which IAA impacts bacteria's biology and promotes disease are not well understood. In collaboration with scientists at Washington University in St. Louis, Missouri, researchers in Ithaca, New York, found that IAA is a signal molecule that regulates gene expression in Pseudomonas syringae. The presence of IAA affects the expression of over 700 genes in the bacteria, including genes involved in Type III secretion, a key component in virulence, and genes involved in stress response. This work offers insight into the roles of auxin promoting bacterial pathogenesis.


Review Publications
Liu, Y., Helmann, T.C., Stodghill, P., Filiatrault, M.J. 2020. Complete genome sequence resource for the necrotrophic plant-pathogenic bacterium Dickeya dianthicola 67-19 isolated from New Guinea Impatiens. Plant Disease. Published Online. https://doi.org/10.1094/PDIS-09-20-1968-A.
Liu, Y., Vasiu, S., Daughtrey, M., Filiatrault, M.J. 2020. First Report of Dickeya dianthicola causing blackleg on New Guinea Impatiens (Impatiens hawkeri) in New York State, USA. Plant Disease. https://doi.org/10.1094/PDIS-09-20-2020-PDN.
Liu, Y., Helmann, T.C., Stodghill, P., Filiatrault, M.J. 2020. Complete genome sequence resource for the necrotrophic plant-pathogenic bacterium Pectobacterium carotovorum WPP14. Plant Disease. https://doi.org/10.1094/PDIS-05-20-1059-A.
Helmann, T.C., Deutschbauer, A., Lindow, S. 2020. Distinctiveness of genes contributing to growth of Pseudomonas syringae in diverse host plant species. PLoS ONE. 15(9):e0239998. https://doi.org/10.1371/journal.pone.0239998.