Mapping and Confirmation of a New Allele at Rpp1 from Soybean PI 594538A Conferring RB Lesion–Type Resistance to Soybean Rust

Authors

• Nanda Chakraborty, University of IllinoisFollow
• Joe Curley, University of Illinois
• Reid D. Frederick, USDA-ARS, Foreign Disease-Weed Science Research UnitFollow
• D. L. Hyten, Soybean Genomics and Improvement Laboratory, Beltsville, MDFollow
• Randall L. Nelson, University of IllinoisFollow
• Glen L. Hartman, University of Illinois
• Brian W. Diers, University of IllinoisFollow

ORCID IDs

D. L. Hyten

Document Type

Article

Date of this Version

2009

Citation

Published in Crop Sci. 49:783–790 (2009).

Abstract

Soybean rust, caused by Phakopsora pachyrhizi (H. Sydow & Sydow), is a destructive soybean [Glycine max (L.) Merr.] disease and identification of new resistance genes is essential for effective rust management. Our research objectives were to map and confirm the location of resistance gene(s) in PI 594538A using a population of 98 F_3:4 lines from across between PI 594538A (reddish-brown [RB] lesions) and the susceptible cultivar Loda (tan [TAN] lesions). The lines were inoculated with the P. pachyrhizi isolate ZM01-1 from Zimbabwe. The RB resistance in PI 594538A mapped on linkage group G as a single dominant gene. This gene is likely an allele of Rpp1 or a new closely linked gene because it mapped within 1 cM of Rpp1 and ZM01-1 produced RB lesions on PI 594538A and TAN lesions on PI 200492, the original source of Rpp1. The mapping of the new Rpp1 allele, named Rpp1-b, was confirmed in a second population.