Publications by authors named "Rory Osborne"
Plants have benefited from interactions with symbionts for coping with challenging environments since the colonisation of land. The mechanisms of symbiont-mediated beneficial effects and similarities and differences to pathogen strategies are mostly unknown. Here, we use 106 (effector-) proteins, secreted by the symbiont Serendipita indica (Si) to modulate host physiology, to map interactions with Arabidopsis thaliana host proteins.
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- * Overexpression of UCP1 in Arabidopsis thaliana leads to changes in nuclear gene expression and affects physiological responses by inhibiting the cytoplasmic PLANT CYSTEINE OXIDASE (PCO) branch of the PROTEOLYSIS (PRT)6 N-degron pathway, which is essential for sensing oxygen levels.
- * This research uncovers a new mechanism where mitochondrial signaling represses the PCO N-de
Chloroplast function requires the coordinated action of nuclear- and chloroplast-derived proteins, including several hundred nuclear-encoded pentatricopeptide repeat (PPR) proteins that regulate plastid mRNA metabolism. Despite their large number and importance, regulatory mechanisms controlling PPR expression are poorly understood. Here we show that the Arabidopsis NOT4A ubiquitin-ligase positively regulates the expression of PROTON GRADIENT REGULATION 3 (PGR3), a PPR protein required for translating several thylakoid-localised photosynthetic components and ribosome subunits within chloroplasts.
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- The study explores how the polycomb repressive complex 2 (PRC2) regulates gene repression in flowering plants and identifies a new mechanism for its control related to oxygen levels.
- Researchers discovered that the plant PRC2 subunit VRN2 has an N-terminal degron that triggers its degradation, shaped by early angiosperm evolution through gene duplication.
- The findings suggest that environmental factors like hypoxia and cold exposure increase VRN2 levels by interfering with its degradation, potentially linking environmental signals to the epigenetic regulation of plant growth and development.