Biotic Stress/Applied Plant Bio

Abstract

CS-3-4 - Localization of a viral protease mediates plant-vector-virus interactions

Sunday, July 15
2:03 PM - 2:23 PM

Vector-borne pathogens often influence host characteristics relevant to host–vector contact, increasing pathogen transmission and survival. Previously, we demonstrated that infection with Turnip mosaic virus increases vector attraction to, and reproduction on, infected hosts. These changes were due to the expression of a single viral protein, NIa-Pro. We demonstrate that NIa-Pro increases aphid attraction to plants by localizing to the nucleus and by increasing ethylene production. We show after aphids arrive at the plant, NIa-Pro temporarily relocalizes to the vacuole. Interestingly, vacuolar localization is required in order for NIa-Pro to enhance aphid reproduction on host plants and inhibit plant defenses. Our results suggest a conserved role for the protein in vector–host interactions, as the phenomenon occurs for other potyviruses that depend on aphid vectors for transmission, while, for potyviruses that are primarily transmitted through seed, it does not. Taken together, these results suggest that potyviruses dynamically respond to the presence of their vectors, promoting insect performance and transmission only when needed.


 

Co-Authors

Aurelie Bak – University of California - Davis; Jun Jiang – University of California - Davis; Nyd Sertsuvalkul – University of California - Davis

Clare L. Casteel, PhD

Assistant Professor
University of California - Davis

Clare Casteel completed her M.S. in entomology at the University of California - Riverside and her Ph.D. in plant biology at the University of Illinois. Since 2014 she has been an assistant professor in the Department of Plant Pathology at the University of California in Davis. Her research addresses the function of microbes in plant-insect interactions using genetic and biochemical approaches. Her current focus is on plant signaling and defenses in response to insect vectors and the pathogens they transmit. Concerned with the practical application of biology and ecology, she has examined impacts of global climate change, soil management and invasive pathosystems on natural and agricultural ecosystems. In addition to her research, she is devoted to teaching and interested in fostering science literacy. She has taught courses in introductory biology, plant pathology and global disease biology.

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