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CROP BREEDING & GENETICS

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

^a Dep. of Crop Sciences, Univ. of Illinois, Urbana, IL 61801
^b current address: Syngenta Seeds, Inc., 317 330th St., Stanton, MN 55018
^c USDA-ARS, Foreign Disease-Weed Science Research Unit, Fort Detrick, MD 21702
^d USDA-ARS, Soybean Genomics and Improvement Lab., Beltsville, MD 20705
^e USDA-ARS, Soybean/Maize Germplasm, Pathology, and Genetics Research Unit, Dep. of Crop Sciences, Univ. of Illinois, Urbana, IL 61801. Trade and manufacturers' names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by USDA implies no approval of the product to the exclusion of others that may also be suitable

^* Corresponding author (nanda.chakraborty{at}syngenta.com).

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 a cross between PI594538A (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.

Abbreviations: BSL-3, Biosafety Level 3 • FDWSRU, USDA-ARS Foreign Disease-Weed Science Research Unit • LG, linkage group • LOD, likelihood of odds • MG, maturity group • QTL, quantitative trait loci/locus • RB, reddish-brown • SBR, soybean rust • SNP, single nucleotide polymorphism • SSR, simple sequence repeat • TAN, tan

This article has been cited by other articles:

				C. Paul and G. L. Hartman Sources of Soybean Rust Resistance Challenged with Single-Spored Isolates of Phakopsora pachyrhizi Crop Sci., August 7, 2009; 49(5): 1781 - 1785. [Abstract] [Full Text] [PDF]