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Evaluation of soybean germplasm for soybean rust (Phakopsora pachyrhizi) resistance in Ha Noi, Vietnam

Presenter: Tri D. Vuong, Dept. of Crop Sciences, University of Illinois-Urbana, IL 61801
Coauthor(s): Anh T. Pham1, Binh T. Nguyen2, Long D. Tran2, Henry T. Nguyen3, Tara VanToai4, Monte R. Miles5, and Glen L. Hartman5. 1Dept. of Crop Sciences, University of Illinois-Urbana, IL 61801; 2Vietnam Agriculture Science Institute (VASI), Ha Noi, Vietnam; 3National Center for Soybean Biotechnology (NCSB), University of Missouri, Columbia, MO 65211; 4USDA-ARS-SDRU, Columbus, OH 43210; 5USDA-ARS and Dept. of Crop Sciences, University of Illinois-Urbana, IL 61801

Soybean rust (Phakopsora pachyrhizi Syd.), a fungal pathogen causing significant yield losses in many soybean production areas of the world, was reported in the continental U.S. in November 2004. The US commercial soybean cultivars are all presumably susceptible to the rust fungus. Evaluation of the USDA soybean germplasm collection, as well as other germplasm, for resistance to the disease is a need for developing soybean rust resistant cultivars. The objective of this study was to evaluate soybean accessions from the US and Vietnam for resistance to the disease at VASI. Fifty seven soybean entries from the US that had been previously evaluated under containment at Fort Detrick, MD and local checks were blocked by maturity and grown in the field in 1 m plots with three replications. Plants were inoculated with 5 104 spores/ml twice at the V6 and R1 growth stages. From R2 through R6 stages, disease severity was assessed on five plants at three canopy positions (upper, middle, lower) on each plant, using a 0-3 severity scale, where 0 = no symptoms and 3 = heavy number pustules (>500). Area under disease progress curve (AUDPC) was computed for statistical analysis using SAS with linear models. An additional evaluation was also conducted in a net house using similar inoculation technique and disease severity assessment. Several US soybean plant introductions (PIs) had soybean rust assessments similar to the local resistant check in both net house and field evaluations. These PIs and local lines may serve as resistant sources for developing lines with soybean rust resistance.

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