The Department of Plant Pathology, Entomology and Microbiology at Iowa State University continued its Fall Seminar Series with a thought-provoking presentation titled “Caterpillar versus Plant: Molecular Specificity of Herbivory.” Approximately 30 faculty, staff, students, and guests gathered to hear the cutting-edge research presented by Dr. Adam Steinbrenner of the University of Washington’s Department of Biology.
The seminar focused on pattern-triggered immunity (PTI), a plant defense system in which cell surface receptors recognize signals from attackers. Receptor-like proteins (RLPs) were highlighted for their role in detecting molecules released by caterpillars during feeds. These proteins contain specialized “island domains” that allow them to identify herbivore-associated molecular patterns (HAMPs). Once detected, the plant initiates defense responses, including the production of ethylene, a hormone that coordinates protective measures against herbivory. Legumes provide a great example of this process. Particular species carry INR genes that activate ethylene production when insects feed on them. These findings illustrate how RLPs can be harnessed to enhance crop resistance.
Looking ahead, the real-world applications of this research are significant. Creating a library of RLPs could help scientists identify receptors that can be transferred across species, offering new tools to fight herbivory. Beyond genetic engineering, understanding how plants produce volatile defenses opens the door to sustainable pest management strategies that recruit beneficial insects rather than relying solely on chemical pesticides. Together, these insights demonstrate how molecular biology can inform practical solutions for agriculture in a changing world.
Audience members appreciated the clarity of the presentation and the way it connected molecular biology to real-world applications. Ed Zaworski, Industry Extension Specialist, said
Adam was well spoken and gave an excellent overview of the concept. Nicolas Herrera, Plant Pathology Graduate Student, mentioned “how RLPs can be ‘primed’ and used in other crop systems,” exemplifying the importance of this research application across crop systems.
The PPEM Fall Seminar Series will wrap up next week on December 16th with a seminar titled “Bees and Beyond” presented by Michael Killewald, Iowa State University, that will discuss his research on pollinators and habitat enhancement in the Midwest.