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Dissertation Defense Seminar (Nov 21): Bethany Huot
November 21, 2016 @ 1:00 pm - 2:00 pm
IMPACT OF ELEVATED TEMPERATURE ON SALICYLIC ACID-DEPENDENT DEFENSE AND BACTERIAL VIRULENCE IN ARABIDOPSIS
A predominant issue of global concern is increasing agricultural output to meet the steady rise in global demand. One of the most significant challenges to meeting this objective is overcoming crop loss due to disease and adverse weather. While individual biotic and abiotic stresses are damaging to plants, they can have catastrophic effects when combined, as most often occurs in the field. It has long been observed that environmental conditions, such as temperature and humidity, play a determining role in the outcome of plant-pathogen interactions. Both low and high temperatures have been shown to promote disease depending on the pathosystem involved. Salicylic acid (SA) is a plant hormone important for protection against a broad spectrum of crop-relevant pathogens. However, the direct effect of elevated temperature on SA-mediated defense is unknown. Using the model Arabidopsis thaliana and Pseudomonas syringae pv. tomato DC3000 plant-pathosystem, my research focused on determining 1) what effect elevated temperature has on SA biosynthesis and signaling, 2) whether observed effects are a direct result of temperature on the host or are also pathogen-dependent and 3) how observed temperature effects on the plant and pathogen interact to determine the final disease outcome. I will present evidence demonstrating that elevated temperature (30°C) affects both the host and pathogen in this system to contribute to enhanced disease.
Bethany’s research was performed with the guidance of co-PIs SY He & BL Montgomery.