Entries by Marlo Hall

A bacterial effector targets a plant iron sensing protein, and benefits pathogen growth (Plant Cell)

Pathogens often appropriate iron from their hosts, as acquisition of iron is vital to sustain life for most organisms. As demonstrated in this paper by Xing et al., an effector protein, AvrRps4, from a common bacterial plant pathogen, Pseudomonas syringae, directly interacts with BRUTUS (BTS), an iron sensing protein in Arabidopsis thaliana. In iron sufficient […]

Review: Recent discoveries show novel sensors and regulation of reactive oxygen species (Nature Plants)

Reactive Oxygen Species (ROS) are produced as metabolic byproducts and are vital participants in development and stress responses. However, ROS can be damaging, and are subcellularly localized to mitigate toxicity. Perception of pathogen attack leads to apoplastic ROS production through Respiratory Burst Oxidase Homologs (RBOHs), which in turn leads to transduction of immune signaling. Perception […]

Phytoplasma effector physically interacts with host proteasome to promote bacterial growth

As a way to circumnavigate the plant innate immune system, phytopathogens evolved effector molecules that protect the pathogen from the plant’s defenses. SAP05, an effector from the insect-vectored phytoplasma Candidatus (a bacterial obligate parasite), is responsible for the plant phenotype observed in witches broom disease, characterized by increased vegetative growth and disrupted reproductive growth. In […]