Research Symposium

BIO

Dakota Ward is an FSU freshman majoring in biological sciences with a minor in math. She hails from Johnson City, Tennessee, although she grew up across the world in Haiti. Her research interests include microbiology, epidemiology, and health equity, and she is interested in pursuing a career in medicine, public health, or environmental protection.

The Role of Membrane Proteins in Plant-Microbe Interactions.

Abstract

Plants display a wide variety of interactions with microbes in the rhizosphere. Some beneficial microbes promote plant health, while pathogenic bacteria employ a host of detrimental biochemicals, including pore-forming toxins (PFTs), that create harmful pores in the cell membrane. The exact mechanisms that plants use for regulating the microbial environment are still being explored. However, research demonstrates that plants possess an innate mechanism to distinguish between harmful pathogens and beneficial rhizosphere bacteria. Despite this, much is still unknown about the specifics of the underlying immune mechanisms. Our project asks the question: what proteins are involved in the differentiation of harmful and beneficial bacteria in the rhizosphere? We hypothesize that membrane repair proteins are crucial to the plant’s innate immune ability to differentiate harmful and beneficial bacteria. To investigate our hypothesis, we used a model system consisting of the well-established plant system Arabidopsis thaliana and two strains of the bacteria Pseudomonas fluorescens: commensal WSC365 and pathogenic N2C3. Our preliminary results suggest that mutants with impaired Synaptotagmin-5, a membrane repair protein, may decrease the plant’s ability to differentiate harmful and beneficial bacteria. The low sample size and high variation in our data means that our results are not conclusive, so more trials should be run. However, these preliminary results are a promising indicator that Synaptotagmin-5 and the membrane repair process are involved in the plant’s innate immune response.

Keywords: Bacteria, Plant, Immune response