NIH Grant Supports Plant-Bacteria Research

By Blake Jackson

A research team at Penn State University is studying how plant-bacteria partnerships support agriculture and environmental health. The team received a $1.96 million grant from the National Institutes of Health to explore how these relationships develop, survive, and improve farming systems.

The project supports long-term research and focuses on mutual partnerships where both plants and bacteria benefit. These relationships play a key role in soil health and plant growth, especially through nitrogen fixation.

“Most research focuses on harmful microbes known as pathogens, but this team studies mutualisms — relationships in which both partners benefit,” said team leader Liana Burghardt.

The study focuses on a plant called Medicago truncatula and its relationship with bacteria. In this system, bacteria enter plant roots and form nodules. Inside these nodules, bacteria convert nitrogen from the air into nutrients that the plant can use. In return, the plant provides sugars that help the bacteria survive and grow.

“Similar to many environmental pathogens, these beneficial partners can live independently, and they re-form their relationship every generation,” Burghardt said. “Bacteria spend much of their time in soil, not inside plants. This creates a complex situation where bacteria must survive in soil, compete to infect plants and adapt to different plant hosts.”

The research focuses on key questions about how bacteria function inside plants, how they survive in soil, and how these partnerships remain stable. Scientists use genetic tools, data analysis, and field studies to track bacterial performance and interactions.

“A win-win from the lab’s perspective is that this knowledge also could improve agriculture by advancing the engineering of nitrogen-fixing bacteria that thrive in soil and benefit plants,” she said. “It could improve agriculture by enhancing the use of natural fertilizers via nitrogen-fixing bacteria.”

This research may lead to better farming practices, improved soil health, and more sustainable agricultural systems.

Photo Credit: istock-pkujiahe