Elucidating the mechanisms by which the plant rhizosphere microbiome modulates systemic plant defenses

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*The goal of my research program is to understand the genes and mechanisms that underlie plant associations with microbial communities (“microbiomes”). Plants and animals depend on their associated microbes for pathogen protection, metabolism, and normal growth and physiology. Microbes in the plant root-associated (“rhizosphere”) microbiome can modulate plant growth and defenses. Understanding the molecular mechanisms that govern plant interactions with beneficial rhizosphere strains is essential to harness the potential of naturally plant-associated bacteria for agricultural improvement.*** *This research proposal focuses on understanding the mechanisms by which closely related rhizosphere bacteria modify systemic plant defenses. Some root-associated bacteria can induce systemic resistance (ISR) against leaf pathogens; however, ISR has thus far been an ineffective tool to replace or augment traditional agronomic pesticides. Additionally, we have found that bacteria closely related to ISR strains can induce systemic susceptibility (ISS) to pathogens. Our preliminary data indicates that ISR and ISS bacteria affect plant uptake of iron and nitrogen respectively. The goal is to figure out the molecular links between nutrient uptake and plant defenses. Because plant nutrient content and disease resistance are of utmost importance for food quality and security, understanding these connections can help promote food safety by reducing the need for agrochemicals.**