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42

Breeding for rust resistance in soybean at the International Institute of Tropical Agriculture, Nigeria

Presenter: R. Bandyopadhyay

All authors and affiliations: R. A. Adeleke (1), B. Asafo-Adjei (1,2), M. Twizeyimana (1), P. S. Ojiambo (1), C. Paul (3), G. L. Hartman (3,4), K. Dashiell (4,5), and R. BANDYOPADHYAY (1). (1) International Institute for Tropical Agriculture (IITA), Ibadan, Nigeria; (2) Crop Research Institute, Kumasi, Ghana; (3) National Soybean Research Center (NSRC), 1101 W. Peabody Drive, Urbana, IL 61801; (4) USDA-ARS; and (5) North Central Agricultural Research Laboratory, 2923 Medary Avenue, Brookings, SD 57006

Soybean rust is now endemic and causing serious losses in Nigeria after it was first reported in 1999. The soybean research program at IITA currently emphasizes development of rust-resistant cultivars for West African farmers for whom host resistance is most economical for disease management. During the initial stages of rust research, we evaluated 208 IITA-bred lines for resistance at four locations under natural disease conditions. Most breeding lines were highly susceptible, but lines TGx 1740-2F and TGx 1903-3F combined a moderate level of resistance and high yielding potential. These two lines will be tested in large-scale trials in rust-endemic areas in 2007. We also obtained sources of rust resistance from the Ugandan national program and the U.S. NSRC. These sources were evaluated for resistance for 3 years in the greenhouse and field under artificial inoculation conditions at Ibadan. Line PI 594538A was most resistant, showing only hypersensitive flecks that did not support sporulation. Lines PI 417089A and UG5 (a breeding line from Uganda) produced the resistant RB reaction and had <10% leaf area damaged with <20% sori sporulating. During 20022003, we crossed UG5 with five high-yielding adapted lines, and nearly 500 F(5:6) progenies from these crosses would be evaluated in multi-location trials for rust, yield, and other adaptation traits in 2007. In 2006, we initiated a crossing program with PI 594538A and selected F(4) progenies from UG5 crosses. Mapping populations are being developed for PI 594538A and UG5 to identify molecular markers for resistance.

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