Organizing Committee


Poster Presentations


Poster Presentations


Evaluation of soybean rust resistance in kudzu

Presenter: G. Kelly O’Brien(1)

Other authors and affiliations: Nicholas S. Dufault(2), Dario F. Narvaez(1), Tristan A. Mueller(1), David L. Wright(1), James J. Marois(1). (1)University of Florida, IFAS/North Florida Research and Education Center, Quincy, FL 32351, U.S.A.; (2)Penn State University, Plant Pathology, University Park, PA 16801, U.S.A.

Kudzu (Pueraria lobata) was introduced to North America ca. 1880 as an ornamental, then widely promoted to reduce soil erosion and as a pasture crop until the 1950s, and now considered an invasive weed, it covers millions of acres. It is susceptible to Phakopsora pachyrhizi, causal agent of soybean rust, and may be key to the pathogen’s ability to overwinter in the southeastern United States. Established kudzu spreads mostly by vegetative growth; thus, a colonized site may be genetically uniform. While soybean rust has become widely established on kudzu, some populations remain free of the disease. This may be due to limited inoculum or because some populations of kudzu are less susceptible. The objective of this study was to determine if specific kudzu populations show resistance to soybean rust. Both young and mature leaves were collected from historically infected and noninfected kudzu sites, inoculated with 1 ml of a ≥300,000 spores/ml suspension, and then incubated on 1% water agar in petri plates for 14 days. Leaves from historically infected populations developed typical disease symptoms; however, the leaves from a noninfected population developed lesions lacking uredinea and urediniospores. Further research is needed to identify the mechanism(s) involved and how complete and widespread this resistance may be.

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