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United States Department of Agriculture

Agricultural Research Service

Related Topics

David R Walker
Soybean/maize Germplasm, Pathology, and Genetics Research
RESEARCH GENETICIST (PLANTS)

Phone: (217) 244-1274
Room 232
1101 WEST PEABODY
URBANA, IL, 61801

Projects
IMPROVED RESISTANCE TO SOYBEAN PATHOGENS AND PESTS
Appropriated (D)
  Accession Number: 422909
IDENTIFICATION AND UTILIZATION OF RESISTANCE TO SOYBEAN RUST
Reimbursable (R)
  Accession Number: 422237
Identification and Utilization of Resistance to Soybean Rust
Specific Cooperative Agreement (S)
  Accession Number: 422811
SOYBEAN GERMPLASM EVALUATION FOR RESISTANCE TO SOYBEAN RUST AND OTHER IMPORTANT DISEASES
Specific Cooperative Agreement (S)
  Accession Number: 423189

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Evaluation of soybean germplasm accessions for resistance to Phakopsora pachyrhizi populations in the southeastern United States, 2009-2012 Reprint Icon - (Peer Reviewed Journal)
Walker, D.R., Harris, D.K., King, Z.R., Li, Z., Boerma, H.R., Buckley, J.B., Weaver, D.B., Sikora, E.J., Shipe, E.R., Mueller, J.D., Nelson, R.L. 2014. Evaluation of soybean germplasm accessions for resistance to Phakopsora pachyrhizi populations in the southeastern United States, 2009-2012. Crop Science. 54(4):1673-1689.
Soybean germplasm accession seedling reactions to soybean rust isolates from Georgia Reprint Icon - (Peer Reviewed Journal)
Walker, D.R., Harris, D.K., King, Z.R., Li, Z., Phillips, D.V., Buck, J.W., Nelson, R.L., Boerma, H.R. 2014. Soybean germplasm accession seedling reactions to soybean rust isolates from Georgia. Crop Science. 54(4):1433-1447.
Identification of fungi on diseased soybean seeds harvested during a high rainfall period in Mato Grosso do Sul, Brazil Reprint Icon - (Peer Reviewed Journal)
Cortina, J.V., Theodoro, G., Walker, D.R. 2013. Identification of fungi on diseased soybean seeds harvested during a high rainfall period in Mato Grosso do Sul, Brazil. Bioscience Journal. 29:386-391.
First report of Phakopsora pachyrhizi adapting to soybean genotypes with Rpp1 or Rpp6 rust resistance genes in field plots in the United States - (Peer Reviewed Journal)
Paul, C., Hartman, G.L., Marois, J., Wright, D., Walker, D.R. 2013. First report of Phakopsora pachyrhizi adapting to soybean genotypes with Rpp1 or Rpp6 rust resistance genes in field plots in the United States. Plant Disease. 97:1379.
Research highlights on breeding for soybean disease resistance in the United States - (Abstract Only)
Li, S., Chen, P., Walker, D.R. 2013. Research highlights on breeding for soybean disease resistance in the United States. International Congress of Plant Pathology Abstracts and Proceedings. 43:98-99.
Pathogenic diversity of Phytophthora sojae and breeding strategies to develop Phytophthora-resistant soybeans - (Peer Reviewed Journal)
Sugimoto, T., Yoshida, S., Kato, M., Kaga, A., Hajika, M., Watanabe, K., Masataka, A., Matoh, T., Walker, D.R., Biggs, A.R., Ishimoto, M. 2012. Pathogenic diversity of Phytophthora sojae and breeding strategies to develop Phytophthora-resistant soybeans. Journal of Breeding Science. 61:511-522.
Genetic analysis and identification of DNA markers linked to a novel Phytophthora sojae resistance gene in the Japanese soybean cultivar Waseshiroge Reprint Icon - (Peer Reviewed Journal)
Sugimoto, T., Yoshida, S., Kaga, A., Hajika, M., Watanabe, K., Aino, M., Tatsuda, K., Yamamoto, R., Matoh, T., Walker, D.R., Biggs, A.R., Ishimoto, M. 2011. Genetic analysis and identification of DNA markers linked to a novel Phytophthora sojae resistance gene in the Japanese soybean cultivar Waseshiroge. Euphytica. 182:133–145. DOI: 10.1007/s10681-011-0525-8p.
Differences in responses and protein profiles of soybean Near Isogenic Lines (NILs) to Phakopsora pachyrhizi inoculation - (Abstract Only)
Ganiger, M., Walker, D.R., Chen, Z. 2011. Differences in responses and protein profiles of soybean Near Isogenic Lines (NILs) to Phakopsora pachyrhizi inoculation [abstract]. American Phytopathological Society, International Plant Protection Congress Joint Meeting, August 6-10, 2011, Honolulu, Hawaii. 2011 CD ROM.
Genetic resistance to soybean rust in PI 567099A is at or near the Rpp3 locus - (Peer Reviewed Journal)
Ray, J.D., Smith, J.R., Morel, W., Bogado, N., Walker, D.R. 2011. Genetic resistance to soybean rust in PI 567099A is at or near the Rpp3 locus. Journal of Crop Improvement. 25(3):219-231.
Saccharin-induced systemic acquired resistance against rust (Phakopsora pachyrhizi) infection in soybean: Effects on growth and development Reprint Icon - (Peer Reviewed Journal)
Srivastava, P., George, S., Marois, J.J., Wright, D.L., Walker, D.R. 2011. Saccharin-induced systemic acquired resistance against rust (Phakopsora pachyrhizi) infection in soybean: Effects on growth and development. Crop Protection. 30(6):726-732.
Evaluation of USDA soybean germplasm accessions for resistance to soybean rust in the southern United States - (Peer Reviewed Journal)
Walker, D.R., Boerma, H.R., Harris, D.K., Phillips, D.V., Schneider, R.W., Hartman, G.L., Miles, M.R., Weaver, D.B., Sikora, E.J., Moore, S.H., Buckley, J.B., Shipe, E.R., Mueller, J.D., Wright, D.L., Marois, J.J., Nelson, R.L. 2011. Evaluation of USDA soybean germplasm accessions for resistance to soybean rust in the southern United States. Crop Science. 51:678-693.
Age-Dependent Variations in Systemic Defense Responses of Soybean Plants towards Soybean Rust Caused by Phakopsora pachyrhizi - (Abstract Only)
Walker, D.R., George, G., Marois, J.J., Wright, D.L. 2010. Age-Dependent Variations in Systemic Defense Responses of Soybean Plants towards Soybean Rust Caused by Phakopsora pachyrhizi [abstract]. 13th Biennial Molecular & Cellular Biology of the Soybean Conference 2010. http://www.ncsu.edu/project/OPDWebSpace/MCBSpdfs/281.pdf.
Saccharin-Mediated Systemic Protection of Soybean Against Infection by Soybean Rust - (Abstract Only)
Srivastava, P., George, S., Marois, J., Wright, D., Walker, D.R. 2010. Saccharin-Mediated Systemic Protection of Soybean Against Infection by Soybean Rust [abstract]. American Phytopathological Society Annual Meeting, August 7-11,2010, Nashville, TN. Phytopathology 100:S122.
Evaluations of Soybean Germplasm Accessions and F5 Recombinant Inbred Lines for Resistance to Phakopsora pachyrhizi - (Abstract Only)
Srivastava, P., Walker, D.R., George, S., Marois, J., Wright, D. 2009. Evaluations of Soybean Germplasm Accessions and F5 Recombinant Inbred Lines for Resistance to Phakopsora pachyrhizi [abstract]. In: Proceedings of the National Soybean Rust Symposium, December 9-11, 2009, New Orleans, LA. p. 19.
Identification and Development of Soybean Rust-Resistant Germplasm Reprint Icon - (Abstract Only)
Walker, D.R. 2009. Identification and Development of Soybean Rust-Resistant Germplasm [abstract]. In: Proceedings of the National Soybean Rust Symposium, December 9-11, 2009, New Orleans, LA.
Tolerance to Soybean Rust in Cultivars from Southeastern U.S. Public Soybean Breeding Programs - (Abstract Only)
Walker, D.R., Srivastava, P., Marois, J.J., Wright, D.L. 2009. Tolerance to Soybean Rust in Cultivars from Southeastern U.S. Public Soybean Breeding Programs [abstract]. In: Proceedings of the National Soybean Rust Symposium, December 9-11, 2009, New Orleans, LA. P. 21.
Changes in Susceptibility to Soybean Rust Caused by Phakopsora pachyrhizi Associated with Plant Age and Leaf Node Position - (Abstract Only)
Srivastava, P., Marois, M., Wright, D., Walker, D.R., Leandro, L. 2009. Changes in Susceptibility to Soybean Rust Caused by Phakopsora pachyrhizi Associated with Plant Age and Leaf Node Position [abstract]. In: Proceedings of the National Soybean Rust Symposium, December 9-11, 2009, New Orleans, LA. p. 5.
Characterization of Variation in Soybean Germplasm Accession Reactions to Soybean Rust (Phakopsora pachyrhizi) Reprint Icon - (Abstract Only)
Walker, D.R., Srivastava, P., Marois, J.J., Wright, D.L., Nelson, R.L. 2009. Characterization of Variation in Soybean Germplasm Accession Reactions to Soybean Rust (Phakopsora pachyrhizi)[abstract]. In: Proceedings of the World Soybean Research Conference VIII, August 9-16, 2009, Beijing, China. Available: www.wsrc2009.cn/en/index.asp.
Confirmation of Molecular Markers and Agronomic Traits Associated with Seed Phytate Content in Two Soybean RIL Populations Reprint Icon - (Peer Reviewed Journal)
Scaboo, A.M., Pantalone, V.R., Walker, D.R., West, D.R., Walker, F.R., Sams, C.E., Boerma, H. 2009. Confirmation of Molecular Markers and Agronomic Traits Associated with Seed Phytate Content in Two Soybean RIL Populations. Crop Science. 49:426-432.
The Effect of Potassium Nitrate on the Reduction of Phytophthora Stem Rot Disease of Soybeans, the Growth Rate and Zoospore Release of Phytophthora Sojae - (Peer Reviewed Journal)
Sugimoto, T., Watanabe, K., Furiki, M., Walker, D.R., Yoshida, S., Aino, M., Kanto, T., Irie, K. 2009. The Effect of Potassium Nitrate on the Reduction of Phytophthora Stem Rot Disease of Soybeans, the Growth Rate and Zoospore Release of Phytophthora sojae. Journal of Phytopathology. 157:379-389.
Marker-Assisted Selection in Soybean Breeding - (Book / Chapter)
Walker, D.R., Monteros, M.J., Yates, J.L. 2010. Marker-Assisted Selection in Soybean Breeding. In: Bilyeu, K., Ratnaparkhe, M.B. and Kole, C. editors. Genetics, Genomics and Breeding of Soybean. Enfield, New Hampshire: Science Publishers. p. 123-167.
Evaluation of soybean germplasm accessions to soybean rust in the southeastern United States and efforts to develop rust-resistant lines - (Abstract Only)
Walker, D.R., Nelson, R.L., Hartman, G.L., Buckley, J., Moore, S.H., Schneider, R.W., Weaver, D.B., Shipe, E.R., Mueller, J.D., Boerma, H. 2008. Evaluation of soybean germplasm accessions to soybean rust in the southeastern United States and efforts to develop rust-resistant lines. [Abstract]. International Crop Science Congress Proceedings, April 13-18, 2008, Jeju, Korea. Abstract #1532.
Variation in Lesion Characteristics, Densities and Sporulation Levels Among Soybean Germplasm Accessions Resistant to Soybean Rust (Phakopsora Pachyrhizi) - (Abstract Only)
Walker, D.R., Pauls, M.K., Wright, D.L., Marois, J.J., Nelson, R.L., Narvaez, D.F. 2008. Variation in Lesion Characteristics, Densities and Sporulation Levels Among Soybean Germplasm Accessions Resistant to Soybean Rust (Phakopsora Pachyrhizi) [abstract]. American Society of Agronomy 2008 Joint Meeting, October 5-9, 2008, Houston, Texas. 2008 CDROM.
Variation in Soybean Rust Reaction Response in a Set of Resistant Germplasm Accessions - (Abstract Only)
Walker, D.R., Narvaez, D., Marois, J.J., Wright, D.L. 2008. Variation in Soybean Rust Reaction Response in a Set of Resistant Germplasm Accessions. 12th Biennial Conference on Molecular and Cellular Biology of the Soybean, July 20-23, 2008, Indianapolis, Indiana. 2008 CDROM.
Identification and characterization of soybean rust resistance in Plant Introductions from the USDA’s soybean germplasm collection - (Abstract Only)
Walker, D.R., Nelson, R.L., Hartman, G.L., Buckley, B., Moore, S., Schneider, R.W., Weaver, D., Shipe, E., Mueller, J., Boerma, H. 2008. Identification and characterization of soybean rust resistance in Plant Introductions from the USDA’s soybean germplasm collection [abstract]. 2008 American Phytopathological Society Annual Meeting. July 26-30, 2008. Minneapolis, MN. p. 98:S195.
Evaluation of soybean germplasm collections for disease reaction and prospects for development of disease resistant varieties - (Abstract Only)
Walker, D.R. 2007. Evaluation of soybean germplasm collections for disease reaction and prospects for development of disease resistant varieties. 2007 National Soybean Rust Symposium. December 12-14, 2007. Louisville, KY. pp. 1-31.
Effects of Defoliating Insect Resistance QTLs and a crylAc Transgene in Soybean Near-Isogenic Lines - (Peer Reviewed Journal)
Zhu, S., Walker, D.R., Boerma, H.R., All, J.N., Parrott, W.A. 2007. Effects of Defoliating Insect Resistance QTLs and a crylAc Transgene in Soybean Near-Isogenic Lines. Theoretical and Applied Genetics. 16:455-463.
Frogeye Leaf Spot of Soybean: A Review and Proposed Race Designations for Isolates of Cercospora Sojina Hara Reprint Icon - (Peer Reviewed Journal)
Mian, R.M., Missaoui, A.M., Walker, D.R., Phillips, D.V., Boerma, H.R. 2008. Frogeye Leaf Spot of Soybean: A Review and Proposed Race Designations for Isolates of Cercospora Sojina Hara. Crop Science. 48:14-24.
Association analysis using SSR markers to identify QTL for seed protein content in soybeans Reprint Icon - (Peer Reviewed Journal)
Jun, T., Van, K., Kim, M., Lee, S., Walker, D.R. 2008. Association analysis using SSR markers to identify QTL for seed protein content in soybeans. Euphytica. 162:179-191.
Registration of five soybean germplasm lines selected within the cultivar ‘Benning’ differing in seed and agronomic traits Reprint Icon - (Germplasm Release)
Fasoula, V.A., Boerma, H., Yates, J.L., Walker, D.R., Finnerty, S.L., Rowan, G.B., Wood, E. 2007. Registration of five soybean germplasm lines selected within the cultivar ‘Benning’ differing in seed and agronomic traits. Journal of Plant Registrations. 1:156-157.
Registration of seven soybean germplasm lines selected within the cultivar ‘Cook’ differing in seed and agronomic traits Reprint Icon - (Germplasm Release)
Fasoula, V.A., Boerma, H., Yates, J.L., Walker, D.R., Finnerty, S.L., Rowan, G.B., Wood, E. 2007. Registration of seven soybean germplasm lines selected within the cultivar ‘Cook’ differing in seed and agronomic traits. Journal of Plant Registrations. 1:158-159.
Registration of six soybean germplasm lines selected within the cultivar ‘Haskell’ differing in seed and agronomic traits Reprint Icon - (Germplasm Release)
Fasoula, V.A., Boerma, H., Yates, J.L., Walker, D.R., Finnerty, S.L., Rowan, G.B., Wood, E. 2007. Registration of six soybean germplasm lines selected within the cultivar ‘Haskell’ differing in seed and agronomic traits. Journal of Plant Registrations. 1:160-161.
Registration of four soybean germplasm lines containing defoliating insect resistance QTLS from PI 229358 introgressed into 'Benning' - (Germplasm Release)
Zhu, S., Walker, D.R., Warrington, C.V., Parrott, W.A., All, J.N., Wood, E.D., Boerma, H.R. 2007. Registration of four soybean germplasm lines containing defoliating insect resistance QTLS from PI 229358 introgressed into 'Benning'. Journal of Plant Registrations. 1:162-163.
Mapping and confirmation of the ‘Hyuuga’ red-brown lesion resistance gene for Asian soybean rust - (Peer Reviewed Journal)
Monteros, M.J., Missaoui, A., Phillips, D.V., Walker, D.R., Boerma, H.R. 2007. Mapping and confirmation of the ‘Hyuuga’ red-brown lesion resistance gene for Asian soybean rust. Crop Science.47(2):829-836 Mar-Apr 2007
Genomics of Insect-Soybean Interactions - (Book / Chapter)
Parrott, W., Walker, D.R., Zhu, S., Boerma, H., All, J. 2008. Genomics of Insect-Soybean Interactions. In: G. Stacey (ed.) Genetics and Genomics of Soybean. New York, NY: Springer. p. 269-291.
Sensitivity of soybean plant introductions to the foliar fungicide tebuconazole (Folicur) - (Abstract Only)
Jarrett, S., Bradley, C., Walker, D.R. 2007. Sensitivity of soybean plant introductions to the foliar fungicide tebuconazole (Folicur) [abstract]. American Society of Agronomy Abstracts. Paper No. 11-9.
Strategies for identifying and capturing resistance to Asian soybean rust - (Abstract Only)
Walker, D.R. 2007. Strategies for identifying and capturing resistance to Asian soybean rust. American Society of Agronomy Abstracts. Paper No. 333-2.
Evaluations of soybean accessions for resistance to soybean rust in the United States - (Abstract Only)
Walker, D.R., Nelson, R.L., Hartman, G.L., Miles, M.R., Schneider, R.W., Moore, S.H., Weaver, D.B., Shipe, E.R., Mueller, J.D., Boerma, H. Evaluations of soybean accessions for resistance to soybean rust in the United States. American Society of Agronomy Abstracts. Paper No. 258-7.
Screening US Soybean Germplasm for Rust Resistance - (Proceedings)
Vuong, T.D., Pham, A.T., Nguyen, B.T., Hartman, G.L., Miles, M.R., Frederick, R.D., Sleper, D.A., Shannon, J., Walker, D.R., Nguyen, H.T. 2006. Screening US Soybean Germplasm for Rust Resistance. In: Proceedings of the American Seed Trade Association Conference, December 5-8, 2006, Chicago, Illinois. 2007 CDROM.
Investigation of possible soybean genotype × fungicide application rate interactions in Asian soybean rust severity - (Abstract Only)
Walker, D.R., Mueller, T.A., Marois, J.J., Wright, D.L. 2006. Investigation of possible soybean genotype × fungicide application rate interactions in Asian soybean rust severity. National Soybean Rust Symposium.( abstract)
Response of Low Seed Phytic Acid Soybeans to Increases in External P Supply - (Peer Reviewed Journal)
Israel, D.W., Kwanyuen, P., Burton, J.W., Walker, D.R. 2007. Response of low seed phytic acid soybeans to increases in external P supply. Crop Sci. 47: 2036-2046.
Last Modified: 12/22/2014
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