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                    U.S. DEPARTMENT OF AGRICULTURE
 Forage Seed and Cereal Research Unit: Corvallis, OR
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ARS Home Pacific West Area Corvallis, Oregon Forage Seed and Cereal Research Unit People & Locations







Ryan  Hayes

                                                                (PhD)
                        Forage Seed and Cereal Research Unit

                        




                        
                        Research Leader
                        Phone: (541) 738-4125
                        
                        
                        Fax: (541) 738-4160(Employee information on this page comes from the REE Directory. Please contact your front office staff to update the REE Directory.)
                            ProjectsDeveloping Decision Support Tools to Incorporate Hemp into Existing Farming Enterprises
                                                    In-House Appropriated
                                                                    (D)Accession Number: 438146Development of Superior Hops and Resilient Hop Production Systems
                                                    In-House Appropriated
                                                                    (D)Accession Number: 445259Optimizing and Stabilizing Economic and Ecological Sustainability of Pacific Northwest Seed Cropping Systems Under Current and Future Climate Conditions
                                                    In-House Appropriated
                                                                    (D)Accession Number: 445390Development of Plant and Molecular Resources to Improve Performance, Utility, and Tolerance of Cool Season Grasses and Legumes
                                                    In-House Appropriated
                                                                    (D)Accession Number: 445802Catalyzing Cover Crop Advancement as a Climate-Smart Practice through a National Variety Improvement and Seed Production Program
                                                    Reimbursable Cooperative Agreement
                                                                    (R)Accession Number: 445208Expanding the Cover Crop Breeding Network: New Species and Traits for Organic Growers (Corvallis)
                                                    Reimbursable Cooperative Agreement
                                                                    (R)Accession Number: 441933Catalyzing cover crop advancement as a climate-smart practice through a national variety improvement and seed production program
                                                    Reimbursable Cooperative Agreement
                                                                    (R)Accession Number: 443925Advancing Our Predictive Understanding of Hemp Through Crop Modeling
                                                    Non-Assistance Cooperative Agreement
                                                                    (S)Accession Number: 445112California-Adapted Barleys for Resistance to Stem Rust (UG99) - An Integrated Effort
                                                    Non-Assistance Cooperative Agreement
                                                                    (S)Accession Number: 443210Sustainable Incorporation of Hemp into American Agricultural Cropping Systems
                                                    Non-Assistance Cooperative Agreement
                                                                    (S)Accession Number: 438331Northwest-Adapted Barleys for Resistance to Stem Rust (UG99)
                                                    Non-Assistance Cooperative Agreement
                                                                    (S)Accession Number: 438431Fostering a Well-rounded and Sustainable Hemp Industry in the United States
                                                    Non-Assistance Cooperative Agreement
                                                                    (S)Accession Number: 438474Advanced Testing of Hop Germplasm
                                                    Non-Assistance Cooperative Agreement
                                                                    (S)Accession Number: 438802Weed Management Research in Seed Cropping Systems
                                                    Non-Assistance Cooperative Agreement
                                                                    (S)Accession Number: 437193**Publications**
                                                (Clicking on the reprint icon
                                                    Reprint Icon
                                                    will take you to the publication reprint.)Genome-wide association mapping in hairy vetch (vicia villosa) discovers a large effect locus controlling seed dormancy

- (Peer Reviewed Journal)Breeding lettuce for resistance against Sclerotina minor
                                                        

- (Peer Reviewed Journal)Simko, I., Subbarao, K.V., Hayes, R.J. 2023. Breeding lettuce for resistance against Sclerotina minor. HortScience. 58(12):1526–1532. https://doi.org/10.21273/HORTSCI17399-23.Breeding soft-seeded hairy vetch

- (Abstract Only)Riday, H., Tilhou, N.W., Kucek, L.K., Ali, S., Carr, B., Young-Mathews, A., Douglas, J., Bhamidimarri, S., Azevedo, M.D., Krogman, S., Monteros, M., Mirsky, S.B., Hayes, R.J., Englert, J. 2023. Breeding soft-seeded hairy vetch. Eucarpia Fodder Crops and Amenity Grasses Section Symposium. September 10-14, 2023.Mapping and identification of genetic loci affecting earliness of bolting and flowering in lettuce
                                                        

- (Peer Reviewed Journal)Rosental, L., Still, D.W., You, Y., Hayes, R.J., Simko, I. 2021. Mapping and identification of genetic loci affecting earliness of bolting and flowering in lettuce. Theoretical and Applied Genetics. 134:3319-3337. https://doi.org/10.1007/s00122-021-03898-9.Elucidating the biological basis of resistance to lettuce drop through cell wall composition analysis

- (Other)Mamo, B.E., Foster, C.E., Adhikari, N.D., Hayes, R.J., Simko, I. 2021. Elucidating the biological basis of resistance to lettuce drop through cell wall composition analysis. Postdoctoral Research Symposium, March 30, 2021, Davis, California (virtual).Epidemiological characterization of lettuce drop (Sclerotinia spp.)
and biophysical features of the host identify soft stem as a
susceptibility factor
                                                        

- (Peer Reviewed Journal)Mamo, B., Eriksen, R.L., Adhikari, N.D., Hayes, R.J., Mou, B., Simko, I. 2021. Epidemiological characterization of lettuce drop (Sclerotinia spp.) and biophysical features of the host identify soft stem as a susceptibility factor. Phytofrontiers. 1(3):182-204. https://doi.org/10.1094/PHYTOFR-12-20-0040-R.Seed dormancy regulated by genotype and environment in Hairy vetch (Vicia villosa Roth)
                                                        

- (Peer Reviewed Journal)Kucek, L.K., Azevedo, M.D., Eagen, S., Ehlke, N., Hayes, R.J., Mirsky, S.B., Reberg-Horton, C., Ryan, M.R., Wayman, S., Wiering, N.P., Riday, H. 2021. Seed dormancy regulated by genotype and environment in Hairy vetch (Vicia villosa Roth). Agronomy Journal. 10(11). Article 1804. https://doi.org/10.3390/agronomy10111804.Genetics of partial resistance against Verticillium dahliae race 2 in wild and cultivated lettuce
                                                        

- (Peer Reviewed Journal)Sandoya, G.V., Truco, M.J., Bertier, L.D., Subbarao, K.V., Simko, I., Hayes, R.J., Michelmore, R.W. 2021. Genetics of partial resistance against Verticillium dahliae race 2 in wild and cultivated lettuce. Phytopathology. 111(5):842-849. https://doi.org/10.1094/PHYTO-09-20-0396-R.Genetics of robustness under nitrogen- and water-deficient conditions in field-grown lettuce
                                                        

- (Peer Reviewed Journal)Macias-Gonzalez, M., Truco, M.J., Smith, R., Cahn, M.D., Simko, I., Hayes, R.J., Michelmore, R.W. 2021. Genetics of robustness under nitrogen- and water-deficient conditions in field-grown lettuce. Crop Science. 61(3):1582-1619. https://doi.org/10.1002/csc2.20380.Genome-wide association mapping reveals loci for shelf life and developmental rate of lettuce
                                                        

- (Peer Reviewed Journal)Sthapit Kandel, J., Peng, H., Hayes, R.J., Mou, B., Simko, I. 2020. Genome-wide association mapping reveals loci for shelf life and developmental rate of lettuce. Theoretical and Applied Genetics. 133:1947–1966. https://doi.org/10.1007/s00122-020-03568-2.Genetics of extended storage life

- (Other)Simko, I., Sthapit Kandel, J., Peng, H., Hayes, R.J., Truco, M.J., Michelmore, R.W. 2020. Genetics of extended storage life. Future of Lettuce Conference, March 16, 2020, Pismo Beach, California.Genetic diversity, linkage disequilibrium and genome-wide association studies in lettuce

- (Abstract Only)Sthapit Kandel, J., Mou, B., Simko, I., Hayes, R.J. 2020. Genetic diversity, linkage disequilibrium and genome-wide association studies in lettuce. Plant and Animal Genome Conference, January 11-15, 2020, San Diego, California.Genetic analysis of resistance to bacterial leaf spot in the heirloom lettuce cultivar Reine des Glaces
                                                        

- (Peer Reviewed Journal)Sandoya, G.V., Maisonneuve, B., Truco, M.J., Bull, C.T., Simko, I., Trent, M., Hayes, R.J., Michelmore, R.W. 2019. Genetic analysis of resistance to bacterial leaf spot in the heirloom lettuce cultivar Reine des Glaces. Molecular Breeding. 39:160. https://doi.org/10.1007/s11032-019-1072-6.Stem rust resistance in USDA perennial ryegrass germplasm

- (Abstract Only)A method to select for root chelation activity in annual ryegrass

- (Abstract Only)Genetic diversity of Puccinia graminis f. sp. lolii from the Willamette Valley

- (Abstract Only)Breeding for soft seeded non shattering hairy vetch (Vicia villosa L.)

- (Abstract Only)Riday, H., Kucek, L.K., Douglas, J.L., Carr, B., Young-Mathews, A., Bhamidimarri, S., Hayes, R.J., Azevedo, M.D., Trammell, M., Monteros, M., Mirsky, S.B., Wiering, N.P., Bickhart, D.M., Sullivan, M.L., Ehlke, N., Englert, J.S. 2019. Breeding for soft seeded non shattering hairy vetch (Vicia villosa L.). National Association of Plant Breeders. 25 to 29 August 2019.Identifying QTL for the control of flowering time under multiple environments in lettuce

- (Abstract Only)Rosental, L., You, Y., Hayes, R.J., Still, D., Simko, I. 2019. Identifying QTL for the control of flowering time under multiple environments in lettuce. Israeli Society of Field and Vegetable Crops Conference, May 27, 2019, Rehovot, Israel.The genetics of resistance to lettuce drop (Sclerotinia spp.) in lettuce in a recombinant inbred line population from Batavia Reine des Glaces x Eruption
                                                        

- (Peer Reviewed Journal)Mamo, B.E., Hayes, R.J., Truco, M., Puri, K.D., Michelmore, R.W., Subbarao, K.V., Simko, I. 2019. The genetics of resistance to lettuce drop (Sclerotinia spp.) in lettuce in a recombinant inbred line population from Batavia Reine des Glaces x Eruption. Theoretical and Applied Genetics. 132(8):2439-2460. https://doi.org/10.1007/s00122-019-03365-6.Genetic architecture of tipburn resistance in lettuce
                                                        

- (Peer Reviewed Journal)Macias Gonzalez, M., Truco, M.J., Bertier, L., Jenni, S., Simko, I., Hayes, R.J., Michelmore, R.W. 2019. Genetic architecture of tipburn resistance in lettuce. Theoretical and Applied Genetics. 132(8):2209–2222. https://doi.org/10.1007/s00122-019-03349-6.Lettuce genetics of lettuce drop and Verticillium wilt resistance

- (Abstract Only)Mamo, B., Hayes, R.J., Simko, I., Subbarao, K.V. 2019. Lettuce genetics of lettuce drop and Verticillium wilt resistance. Soilborne Plant Pathogens Conference, March 26-28, 2019, San Marino, CA.Variation in nutrient contents and retention in fresh-cut lettuce

- (Abstract Only)Sthapit Kandel, J., Mou, B., Simko, I., Hayes, R.J. 2019. Variation in nutrient contents and retention in fresh-cut lettuce. American Society for Horticultural Science Annual Conference, July 21-25, 2019, Las Vegas, Nevada.Identifying QTL for the control of flowering time under multiple environments in lettuce

- (Other)Rosental, L., You, Y., Hayes, R.J., Still, D., Simko, I. 2019. Identifying QTL for the control of flowering time under multiple environments in lettuce. Israeli Society of Plant Sciences Conference, February 13, 2019, Sede Boqer, Israel.Accuracy, reliability, and timing of visual evaluations of decay in fresh-cut lettuce
                                                        

- (Peer Reviewed Journal)Simko, I., Hayes, R.J. 2018. Accuracy, reliability, and timing of visual evaluations of decay in fresh-cut lettuce. PLoS One. 13(4):e0194635. https://doi.org/10.1371/journal.pone.0194635.Genome-wide association mapping of loci for the rate of deterioration in fresh-cut lettuce

- (Abstract Only)Sthapit, J., Mou, B., Hayes, R.J., Simko, I. 2018. Genome-wide association mapping of loci for the rate of deterioration in fresh-cut lettuce. American Society of Plant Biologists Annual Meeting, July 14-18, 2018, Montreal, Canada.Genome-wide association mapping of deterioration in fresh-cut lettuce

- (Abstract Only)Sthapit, J., Mou, B., Simko, I., Hayes, R.J. 2018. Genome-wide association mapping of deterioration in fresh-cut lettuce. American Society of Horticultural Science Annual Meeting, July 31-August 3, 2018, Washington, DC.Coordinated regulation of cold induced sweetening in tetraploid potato families by isozymes of UDP-glucose pyrophosphorylase and vacuolar acid invertase

- (Peer Reviewed Journal)Sowokinos, J.R., Hayes, R.J., Thill, C. 2018. Coordinated regulation of cold induced sweetening in tetraploid potato families by isozymes of UDP-glucose pyrophosphorylase and vacuolar acid invertase. American Journal of Potato Research. 95:487-494.Molecular markers reliably predict post-harvest decay of fresh-cut lettuce in modified atmosphere packaging
                                                        

- (Peer Reviewed Journal)Simko, I., Hayes, R.J., Truco, M., Michelmore, R.W., Antonise, R., Massoudi, M. 2018. Molecular markers reliably predict post-harvest decay of fresh-cut lettuce in modified atmosphere packaging. Horticulture Research. 5:21. https://doi.org/10.1038/s41438-018-0022-5.Characterization of resistance to lettuce drop, and its association with plant architecture and composition in lettuce

- (Abstract Only)Mamo, B.E., Adhikari, N.D., Foster, C., Zucker, L., Hayes, R.J., Subbarao, K.V., Simko, I. 2018. Characterization of resistance to lettuce drop, and its association with plant architecture and composition in lettuce. International Congress of Plant Pathology, July 29-August 3, 2018, Boston, Massachusetts.Release of three iceberg lettuce populations that combined resistance to two soil borne diseases
                                                        

- (Peer Reviewed Journal)Hayes, R.J., Sandoya, G., Mou, B., Simko, I., Subbarao, K.V. 2018. Release of three iceberg lettuce populations that combined resistance to two soil borne diseases. HortScience. 53(2):247-250. https://doi.org/10.21273/HORTSCI12559-17.Breeding and genetics of lettuce for resistance against race 2 Verticillium wilt

- (Abstract Only)Sandoya, G.V., Truco, M.J., Subbarao, K.V., Martin, F.N., Michelmore, R.M., Hayes, R.J., Simko, I. 2017. Breeding and genetics of lettuce for resistance against race 2 Verticillium wilt. National Association of Plant Breeders Annual Meeting, August 7-10, 2017, Davis, California.Genome-wide association study for lettuce cultivars with improved salad processing efficiency

- (Abstract Only)Sthapit, J.K., Mou, B., Simko, I., Hayes, R.J. 2017. Genome-wide association study for lettuce cultivars with improved salad processing efficiency. American Society for Horticultural Science Annual Meeting, September 19-22, 2017, Waikoloa, Hawaii.Genetic characterization of resistance to Sclerotinia in lettuce cultivar Eruption

- (Abstract Only)Mamo, B.E., Hayes, R.J., Truco, M.J., Michelmore, R., Subbarao, K.V., Simko, I. 2017. Genetic characterization of resistance to Sclerotinia in lettuce cultivar Eruption. American Phytopathological Society Annual Meeting, August 5-9, 2017, San Antonio, Texas.Characterization of Verticillium dahliae disease reactions in lettuce differential cultivars

- (Abstract Only)Short, D.P.G., Puri, K., Sandoya, G.V., Simko, I., Hayes, R.J., Subbarao, K.V. 2017. Characterization of Verticillium dahliae disease reactions in lettuce differential cultivars. American Phytopathological Society Annual Meeting, August 5-9, 2017, San Antonio, Texas.Nondestructive phenotyping of lettuce plants in early stages of development with optical sensors

- (Peer Reviewed Journal)Simko, I., Hayes, R.J., Furbank, R.T. 2016. Nondestructive phenotyping of lettuce plants in early stages of development with optical sensors. Frontiers in Plant Science. 7:1-19.Genetics of resistance in lettuce to races 1 and 2 of Verticillium dahliae from different host species

- (Peer Reviewed Journal)Sandoya, G.V., Gurung, S., Short, D.P., Subbarao, K.V., Michelmore, R.M., Hayes, R.J. 2016. Genetics of resistance in lettuce to races 1 and 2 of Verticillium dahliae from different host species. Euphytica. 213:20. doi: 10.1007/s10681-016-1813-0.Genetics of the partial resistance against race 2 of Verticillium dahliae in lettuce

- (Proceedings)Sandoya, G.V., Truco, M., Bertier, L., Subbarao, K.V., Michelmore, R., Simko, I., Hayes, R.J. 2016. Genetics of the partial resistance against race 2 of Verticillium dahliae in lettuce. American Society for Horticultural Science Annual Meeting. Available: https://ashs.confex.com/ashs/2016/webprogram/Paper24442.html.Lettuce and spinach breeding

- (Proceedings)Simko, I., Hayes, R.J., Mou, B., McCreight, J.D. 2016. Lettuce breeding. California Leafy Greens Research Board Annual Meeting. Available: http://calgreens.org/wp-content/uploads/2016/06/Lettuce-Breeding-USDA-ARS-Simko-Mou-and-McCreight.pdf.Breeding lettuce for improved fresh-cut processing

- (Peer Reviewed Journal)Hayes, R.J., Simko, I. 2016. Breeding lettuce for improved fresh-cut processing. Acta Horticulturae. 1141:65-76. doi: 10.17660/ActaHortic.2016.1141.7.Assessing genetic variation in lettuce for traits related to nitrogen use efficiency using susceptibility and relative efficiency indices

- (Proceedings)Gonzalez, M.M., Truco, M., Michelmore, R., Smith, R., Cahn, M., Simko, I., Hayes, R.J. 2015. Assessing genetic variation in lettuce for traits related to nitrogen use efficiency using susceptibility and relative efficiency indices. ASA, CSSA, and SSSA Annual Meeting. Available: https://scisoc.confex.com/scisoc/2015am/webprogram/Paper93179.html.Comparing the predictive abilities of phenotypic and marker-assisted selection methods in a biparental lettuce population
                                                        

- (Peer Reviewed Journal)Hadasch, S., Simko, I., Hayes, R.J., Ogutu, J.O., Piepho, H.-P. 2016. Comparing the predictive abilities of phenotypic and marker-assisted selection methods in a biparental lettuce population. The Plant Genome. 9(1):1-11.USDA lettuce breeding and genetics

- (Proceedings)Hayes, R.J. 2015. USDA lettuce breeding and genetics. University of California SeedCentral Forum, June 25, 2015, Salinas, California.Breeding lettuce for fresh-cut processing

- (Abstract Only)Hayes, R.J., Simko, I. 2015. Breeding lettuce for fresh-cut processing. III International Conference on Fresh-cut Produce: Maintaining Quality and Safety, September 13-18, 2015, Davis, California.Sustainable lettuce: Adaptability to uncertain production conditions

- (Abstract Only)Hayes, R.J. 2015. Sustainable lettuce: Adaptability to uncertain production conditions. American Society for Horticultural Science Annual Meeting, "Climate Change - Realities, Controversies, and Responses" Colloquium, August 3-7, 2015, New Orleans, Louisiana.Non-defoliating and defoliating strains from cotton correlate with races 1 and 2 of Verticillium dahliae

- (Peer Reviewed Journal)Hu, X., Gurung, S., Short, D.P., Sandoya, G., Shang, W., Hayes, R.J., Subbarao, K.V. 2015. Non-defoliating and defoliating strains from cotton correlate with races 1 and 2 of Verticillium dahliae. Plant Disease. doi: 10.1094/PDIS-03-15-0261-RE.Resistance to downy mildew in lettuce ‘La Brillante’ is conferred by dm50 gene and multiple QTL

- (Peer Reviewed Journal)Simko, I., Ochoa, O.E., Pel, M.A., Tsuchida, C., Forcada, C.F., Hayes, R.J., Truco, M.J., Antonise, R., Galeano, C.H., Michelmore, R.W. 2015. Resistance to downy mildew in lettuce ‘La Brillante’ is conferred by dm50 gene and multiple QTL. Phytopathology. 105:1220-1228.Screening of wild and cultivated Capsicum germplasm reveals new sources of Verticillium wilt resistance

- (Peer Reviewed Journal)Gurung, S., Short, D.P., Hu, X., Sandoya, G., Hayes, R.J., Subbarao, K.V. 2015. Screening of wild and cultivated Capsicum germplasm reveals new sources of Verticillium wilt resistance. Plant Disease. doi: 10.1094/PDIS-01-15-0113-RE.Breeding and genetics of lettuce against race 2 of Verticillium wilt

- (Abstract Only)Sandoya, G., Michelmore, R., Subbarao, K.V., Hayes, R.J. 2015. Breeding and genetics of lettuce against race 2 of Verticillium wilt. EUCARPIA Leafy Vegetables Congress, April 14-17, 2015, San Pedro del Pinatar, Spain.Genetics and breeding of bacterial leaf spot resistance

- (Abstract Only)Hayes, R.J., Michelmore, R., Bull, C.T. 2015. Genetics and breeding of bacterial leaf spot resistance. EUCARPIA Leafy Vegetables Congress, April 14-17, 2015, San Pedro del Pinatar, Spain.Host range of Verticillium isaacii and Verticillium klebahnii from artichoke, spinach, and lettuce

- (Peer Reviewed Journal)Gurung, S., Short, D.P., Hu, X., Sandoya, G., Hayes, R.J., Koike, S., Subbarao, K.V. 2015. Host range of Verticillium isaacii and Verticillium klebahnii from artichoke, spinach, and lettuce. Plant Disease. doi: 10.1094/PDIS-12-14-1307-RE.Dynamics of Verticillium species microsclerotia in field soils in response to fumigation, cropping patterns, and flooding

- (Peer Reviewed Journal)Short, D., Sandoya, G., Vallad, G., Koike, S., Xiao, C., Wu, B., Gurung, S., Hayes, R.J., Subbarao, K. 2015. Dynamics of Verticillium species microsclerotia in field soils in response to fumigation, cropping patterns, and flooding. Phytopathology. 105:638-645.The inheritance of resistance to bacterial leaf spot of lettuce caused by Xanthomonas campestris pv. vitians in three lettuce cultivars

- (Peer Reviewed Journal)Hayes, R.J., Trent, M., Truco, M., Antonise, R., Michelmore, R.W., Bull, C.T. 2014. The inheritance of resistance to bacterial leaf spot of lettuce caused by Xanthomonas campestris pv. vitians in three lettuce cultivars. Horticulture Research. 1:14066.Host genotype and hypersensitive reaction influence population levels of Xanthomonas campestris pv. vitians in lettuce

- (Peer Reviewed Journal)Bull, C.T., Gebben, S.J., Goldman, P.H., Trent, M., Hayes, R.J. 2015. Host genotype and hypersensitive reaction influence population levels of Xanthomonas campestris pv. vitians in lettuce. Phytopathology. 105:316-324.Inheritance of decay of salad-cut lettuce in a recombinant inbred line population from ‘Salinas 88’ x ‘La Brillante’

- (Peer Reviewed Journal)Hayes, R.J., Galeano, C.H., Luo, Y., Antonise, R., Simko, I. 2014. Inheritance of decay of salad-cut lettuce in a recombinant inbred line population from ‘Salinas 88’ x ‘La Brillante’. Journal of the American Society for Horticultural Science. 139:388-398.Characterization and performance of 16 new inbred lines of lettuce
                                                        

- (Peer Reviewed Journal)Simko, I., Hayes, R.J., Bull, C.T., Mou, B., Luo, Y., Trent, M.A., Atallah, A.J., Ryder, E.J., Sideman, R.G. 2014. Characterization and performance of 16 new inbred lines of lettuce. HortScience. 49:679-687.Notice of release of iceberg, romaine, and leaf lettuce breeding lines with improved disease resistance

- (Germplasm Registration)Simko, I., Hayes, R.J. 2014. Notice of release of iceberg, romaine, and leaf lettuce breeding lines with improved disease resistance. Germplasm Release. Available: http://calgreens.org/wp-content/uploads/2014/03/USDA-Releases-Sixteen-New-Breeding-LInes-of-Lettuce1.pdf.Development of a high-density intra-specific linkage map of lettuce using genotyping by sequencing (GBS)

- (Proceedings)Galeano, C.H., Froenicke, L., Duitama, J., Kozik, A., Reyes-Chin-Wo, S., Simko, I., Hayes, R.J., Michelmore, R. 2014. Development of a high-density intra-specific linkage map of lettuce using genotyping by sequencing (GBS). Plant and Animal Genome XXII Conference, January 11-15, 2014, San Diego, California. P686.Baby leaf lettuce germplasm enhancement: developing diverse populations with resistance to bacterial leaf spot caused by Xanthomonas campestris pv. vitians

- (Peer Reviewed Journal)Hayes, R.J., Trent, M.A., Mou, B., Simko, I., Gebben, S.J., Bull, C.T. 2014. Baby leaf lettuce germplasm enhancement: developing diverse populations with resistance to bacterial leaf spot caused by Xanthomonas campestris pv. vitians. HortScience. 49:18–24.Yield gains in leafy vegetables

- (Book / Chapter)Simko, I., Hayes, R.J., Mou, B., McCreight, J.D. 2014. Yield gains in leafy vegetables. In: Smith, S., Diers, B., Specht, J., Carver, B., editors. Yield gains in major U.S. field crops. CSSA Special Publications 33. Madison, WI: American Society of Agronomy, Inc., Crop Science Society of America, Inc., and Soil Science Society of America, Inc. p. 53-86.Evaluation and Quantitative trait loci mapping of resistance to powdery mildew in lettuce

- (Peer Reviewed Journal)Simko, I., Rauscher, G., Sidemann, R., McCreight, J.D., Hayes, R.J. 2013. Evaluation and Quantitative trait loci mapping of resistance to powdery mildew in lettuce. Plant Pathology. DOI: 10.1111/ppa.12087.Detection and quantification of Verticillium dahliae in spinach seed

- (Abstract Only)Duressa, D., Rauscher, G.M., Koike, S.T., Mou, B., Hayes, R.J., Maruthachalam, K., Subbarao, K.V., Klosterman, S.J. 2013. Detection and quantification of Verticillium dahliae in spinach seed. Acta Phytopathologica Sinica. 43 (supplement):245.Computing Integrated Ratings from Heterogeneous Phenotypic Assessments: A Case Study of Lettuce Postharvest Quality and Downy Mildew Resistance

- (Peer Reviewed Journal)Simko, I., Hayes, R.J., Kramer, M.H. 2012. Computing integrated ratings from heterogeneous phenotypic assessments: A case study of lettuce postharvest quality and downy mildew resistance. Crop Science. 52:2131-2142.A real-time PCR assay for detection and quantification of verticillium dahliae in spinach seed

- (Peer Reviewed Journal)Duressa, D.O., Rauscher, G.M., Koike, S.T., Mou, B., Hayes, R.J., Maruthachalam, K., Subbarao, K.V., Klosterman, S.J. 2012. A real-time PCR assay for detection and quantification of verticillium dahliae in spinach seed. Phytopathology. 102:443-451.Selection for resistance to Verticillium wilt caused by race 2 isolates of Verticillium dahliae in accessions of lettuce (Lactuca sativa L.).

- (Peer Reviewed Journal)Hayes, R.J., Maruthachalam, K., Vallad, G.E., Klosterman, S.J., Subbarao, K.V. 2011. Selection for resistance to Verticillium wilt caused by race 2 isolates of Verticillium dahliae in accessions of lettuce (Lactuca sativa L.).HortScience. 46(2):201-206.Verticillium comparative genomics yields insights into niche adaptation by plant vascular wilt pathogens.

- (Abstract Only)Klosterman, S.J., Subbarao, K.V., Kang, S., Veronese, P., Gold, S.E., Thomma, B., Chen, Z., Henrissat, B., Lee, Y., Park, J., Garcia-Pedrajas, M.D., Barbara, D., Anchieta, A.G., Jonge, R., Santhanam, P., Maruthachalam, K., Atallah, Z.K., Amyotte, S., Paz, Z., Inderbitzin, P., Hayes, R.J., Heiman, D., Young, S., Zeng, Q., Engels, R., Galagan, J., Cuomo, C., Dobinson, K.F., Ma, L. 2011. Verticillium comparative genomics yields insights into niche adaptation by plant vascular wilt pathogens. Phytopathology. 101:S208.Development of a qPCR assay for quantification of verticillium dahliae in spinach seed.

- (Abstract Only)Duressa, D.O., Rauscher, G.M., Mou, B., Hayes, R.J., Koike, S.T., Maruthachalam, K., Subbarao, K.V., Klosterman, S.J. 2011. Development of a qPCR assay for quantification of verticillium dahliae in spinach seed.Phytopathology. 101:S46.Lettuce cultivar influences Xanthomonas campestris pv. vitians population levels

- (Abstract Only)Gebben, S., Hayes, R.J., Bull, C.T. 2011. Lettuce cultivar influences Xanthomonas campestris pv. vitians population levels. Phytopathology. 101:S59.SSH reveals a linkage between a senescence-associated protease and Verticillium wilt symptom development in lettuce (Lactuca sativa)

- (Peer Reviewed Journal)Klosterman, S.J., Anchieta, A.G., Garcia-Pedrajas, M.D., Maruthachalam, K., Hayes, R.J., Subbarao, K.V. 2011. SSH reveals a linkage between a senescence-associated protease and Verticillium wilt symptom development in lettuce (Lactuca sativa). Physiological and Molecular Plant Pathology. 76:48-58.Comparative genomics yields insights into niche adaptation of plant vascular wilt pathogens.

- (Peer Reviewed Journal)Klosterman, S.J., Subbarao, K.V., Kang, S., Veronese, P., Gold, S.E., Thomma, B.P.H.J, Chen, Z., Henrissat, B., Lee, Y., Park, J., Garcia-Pedrajas, M.D., Dez, B.J., Anchieta, A.G., De Jonge, R., Parthasarathy, S., Maruthachalam, K., Atallah, Z.K., Amyotte, S., Paz, Z., Inderbitizin, P., Hayes, R.J., Heiman, D.I., Young, S., Zeng, Q., Engels, R., Galagan, J., Cuomo, C., Dobinson, K.F., Ma, L-J. 2011. Comparative genomics yields insights into niche adaptation of plant vascular wilt pathogens. PLoS Pathogens. 7(7): e1002137.Developing lettuce with improved quality for processed salads.

- (Abstract Only)Hayes, R.J., Truco, M.J., Mchale, L.K., Michelmore, R.W., Antonise, R., Hand, P., Simko, I. 2011. Developing lettuce with improved quality for processed salads. Eucarpia Conference on Lettuce and Leafy Vegetables. August 24, 2011, Lille, France.The inheritance of resistance to Verticillium wilt caused by race 1 isolates of Verticillium dahliae in the lettuce cultivar La Brillante.

- (Peer Reviewed Journal)Hayes, R.J., Mchale, L.K., Vallad, G.E., Jose-Truco, M., Michelmore, R.W., Klosterman, S.J., Maruthachalam, K., Subbarao, K.V. 2011. The inheritance of resistance to Verticillium wilt caused by race 1 isolates of Verticillium dahliae in the lettuce cultivar La Brillante. Theoretical and Applied Genetics. DOI 10.1007/s00122-011-1603-y.Fifteen years of verticillium wilt of lettuce in america’s salad bowl: a tale of immigration, subjugation and abatement.

- (Peer Reviewed Journal)Atallah, Z.K., Hayes, R.J., Subbarao, K.V. 2011. Fifteen years of verticillium wilt of lettuce in america’s salad bowl: a tale of immigration, subjugation and abatement. Plant Disease. DOI:10.1094/PDIS-01-11-0075.Mapping dominant negative mutation for triforine sensitivity in lettuce and its use as a selectable marker for detecting hybrids.

- (Peer Reviewed Journal)Simko, I., Hayes, R.J., Truco, M.J., Michelmore, R.W. 2011. Mapping dominant negative mutation for triforine sensitivity in lettuce and its use as a selectable marker for detecting hybrids. Euphytica. 182(2):157-166.Iceberg lettuce breeding lines with resistance to Verticillium wilt caused by race 1 isolates of Verticillium dahliae.

- (Peer Reviewed Journal)Hayes, R.J., Maruthachalam, K., Vallad, G.E., Klosterman, S.J., Simko, I., Luo, Y., Subbarao, K.V. 2011. Iceberg lettuce breeding lines with resistance to Verticillium wilt caused by race 1 isolates of Verticillium dahliae. HortScience. 46(3):501-504.Selenium accumulation in lettuce germplasm

- (Peer Reviewed Journal)Ramos, S., Rutzke, M., Hayes, R.J., Faquin, V., Guilherme, L.R., Li, L. 2010. Selenium accumulation in lettuce germplasm. Planta. 233:649-660.Identification of pathogenicity-related genes in the vascular wilt fungus verticillium dahliae by agrobacterium tumefaciens-mediated t-DNA insertional mutagenesis.

- (Peer Reviewed Journal)Maruthachalam, K., Klosterman, S.J., Kang, S., Hayes, R.J., Subbarao, K.V. 2011. Identification of pathogenicity-related genes in the vascular wilt fungus verticillium dahliae by agrobacterium tumefaciens-mediated t-DNA insertional mutagenesis. Molecular Biotechnology. PMID:21424547.Verticillium comparative genomics yields insights into niche adaptation by plant vascular wilt pathogens

- (Abstract Only)Klosterman, S.J., Subbarao, K.V., Kang, S., Veronese, P., Gold, S.E., Thomma, B.J., Chen, Z., Henrissat, B., Lee, Y., Park, J., Garcia-Pedrajas, M.D., Barbara, D., Anchieta, A.G., De Jonge, R., Santhanam, P., Maruthachalam, K., Atallah, Z.K., Amyotte, S., Paz, Z., Inderbitzin, P., Hayes, R.J., Heiman, D.I., Young, S., Zeng, Q., Engels, R., Galagan, J., Cuomo, C., Dobinson, K.F., Ma, L. 2011. Verticillium comparative genomics yields insights into niche adaptation by plant vascular wilt pathogens. Plant and Animal Genome Conference. Online.A single recessive gene conferring short leaves in romaine x Latin type lettuce (Lactuca sativa L.) crosses, and its effect on plant morphology and resistance to lettuce drop caused by Sclerotinia minor Jagger.

- (Peer Reviewed Journal)Hayes, R.J., Wu, B., Subbarao, K.V. 2011. A single recessive gene conferring short leaves in romaine x Latin type lettuce (Lactuca sativa L.) crosses, and its effect on plant morphology and resistance to lettuce drop caused by Sclerotinia minor Jagger. Plant Breeding. 130:388-393.Molecular variation among isolates of verticillium dahliae and PCR-based differentiation of races.

- (Peer Reviewed Journal)Maruthachalam, K., Atallah, Z.K., Vallad, G.E., Klosterman, S.J., Hayes, R.J., Davis, R., Subbarao, K.V. 2010. Molecular variation among isolates of verticillium dahliae and PCR-based differentiation of races. Phytopathology. 100(11):1222-30.Molecular variation among isolates of verticillium dahliae and PCR-based differentiation of races.

- (Peer Reviewed Journal)Maruthachalam, K., Atallah, Z.K., Vallad, G.E., Klosterman, S.J., Hayes, R.J., Davis, M.R., Subbarao, K. 2010. Molecular variation among isolates of verticillium dahliae and PCR-based differentiation of races. Phytopathology. 11:1222-30.A qPCR assay for detection and quantification of Verticillium dahliae in spinach seed.

- (Abstract Only)Rauscher, G.M., Mou, B., Hayes, R.J., Koike, S.T., Maruthachalam, K., Subbarao, K.V., Klosterman, S.J. 2010. A qPCR assay for detection and quantification of Verticillium dahliae in spinach seed.. Phytopathology.  100:S107.SM09A and SM09B: Romaine Lettuce Breeding Lines Resistant to Dieback and with Improved Shelf-life.

- (Peer Reviewed Journal)Simko, I., Hayes, R.J., Subbarao, K.V., Sideman, R.G. 2010. SM09A and SM09B: Romaine Lettuce Breeding Lines Resistant to Dieback and with Improved Shelf-life.. HortScience,Year 2010, volume 45, pages 670-672.Population analyses of the vascular plant pathogen Verticillium dahliae detect recombination and transcontinental gene flow

- (Peer Reviewed Journal)Atallah, Z.K., Maruthachalam, K.K., Du Toit, L.J., Koike, S.T., R. Michael, D., Klosterman, S.J., Hayes, R.J., Subbarao, K.V. 2010. Population analyses of the vascular plant pathogen, Verticillium dahliae detect recombination and transcontinental gene flow. Fungal Genetics and Biology. 47:416-422.Assessment of resistance in lettuce (Lactuca sativa L.) to mycelial and ascospore infection by S.sclerotinia minor Jagger and S. sclerotiorum (Lib.) de Bary

- (Peer Reviewed Journal)Hayes, R.J., Wu, B., Pryor, B.M., Subbarao, K.V. Assessment of resistance in lettuce (Lactuca sativa L.) to mycelial and ascospore infection by S.sclerotinia minor Jagger and S. sclerotiorum (Lib.) de Bary. HortScience 45:333-341.Genetic variation, genotype x environment interaction, and selection for tipburn resistance in lettuce in multi-environments.

- (Peer Reviewed Journal)Jenni, S., Hayes, R.J. 2010. Genetic variation, genotype x environment interaction, and selection for tipburn resistance in lettuce in multi-environments.. Euphytica, Feb 2010, Vol 171 (3), pages 427-439.QTL mapping of resistance to Powdery Mildew in lettuce.

- (Abstract Only)Rauscher, G.M., Hayes, R.J., Simko, I. 2009. QTL mapping of resistance to Powdery Mildew in lettuce. Phytopathology 99:S107.A soilless Verticillium wilt assay using an early flowering lettuce

- (Peer Reviewed Journal)Klosterman, S.J., Hayes, R.J. 2009. A soilless Verticillium wilt assay using an early flowering lettuce. Plant Disease. 93:691-698,2009.Identification of lettuce genes differentially expressed in a Verticillium dahliae-lettuce interaction by suppression subtractive hybridization

- (Abstract Only)Klosterman, S.J., Anchieta, A.G., Maruthachalam, K., Hayes, R.J., Subbarao, K.V. 2009. Identification of lettuce genes differentially expressed in a Verticillium dahliae-lettuce interaction by suppression subtractive hybridization. Phytopathology Supplement; APSnet (Plant Pathology Online).Development of rapid pathogenicity assay for Verticillium dahliae using early flowering lettuce.

- (Abstract Only)Klosterman, S.J., Hayes, R.J. Development of rapid pathogenicity assay for Verticillium dahliae using early flowering lettuce.. Phytopathology.Population biology of Verticillium dahliae isolates from lettuce in the Sallinas Valley of Californis.

- (Abstract Only)Phytopathology 98:S14Genetic Variation for Shelf-life of Salad-cut Lettuce in Modified-atmosphere Environments

- (Peer Reviewed Journal)Hayes, R.J., Liu, Y. 2008. Genetic Variation for Shelf-life of Salad-cut Lettuce in Modified-atmosphere Environments. Journal American Society Horticultural Science. 133(2):228-233.Genetic Diversity of Lettuce (Lactuca sativa) for Resistance to Bacterial Leaf Spot Caused by Xanthomonas campestris pv. vitians.

- (Peer Reviewed Journal)Bull, C.T., Goldman, P.H., Hayes, R.J., Madden, L.V., Koike, S.T., Ryder, E.J. 2007. Genetic Diversity of Lettuce (Lactuca sativa) for Resistance to Bacterial Leaf Spot Caused by Xanthomonas campestris pv. vitians. Online:Plant Health Progress DOI:10.1094/PHP-2007-0917-02-RS.CRISPHEAD BREEDING LINES WITH RESISTANCES TO CORKY ROOT AND LETTUCE MOSAIC

- (Peer Reviewed Journal)Mou, B., Hayes, R.J., Ryder, E.J. 2007. Crisphead breeding lines with resistances to corky root and lettuce mosaic. HortScience. 42:701-703.VARIATION FOR RESISTANCE TO VERTICILLIUM WILT IN LETTUCE (LACTUCA SATIVA L.).

- (Peer Reviewed Journal)Hayes, R.J., Vallad, G., Qin, Q., Grube, R., Subbarao, K. 2007. Variation for Resistance to Verticillium Wilt in Lettuce (Lactuca Sativa L.). Plant Disease. 91(4):439-445.Verticillium wilts and management with special emphasis on lettuce.

- (Abstract Only)Subbarao, K.V., Vallad, G.E., Hayes, R.J. 2007. Verticillium wilts and management with special emphasis on lettuce. In Eucarpia Leafy Vegetables 2007 Conference Abstracts. University of Warwick, UK, April 2007. pp. 15.Variation for Big Vein Resistance in Lactuca virosa L. and Introgression of Resistance into Cultivated Lettuce (Lactuca sativa L.).

- (Abstract Only)Hayes, R.J., Ryder, E.J., Wintermantel, W.M. 2007. Variation for Big Vein Resistance in Lactuca virosa L. and Introgression of Resistance into Cultivated Lettuce (Lactuca sativa L.). In Eucarpia Leafy Vegetables 2007 Conference Abstracts, University of Warwick, UK. pp. 16.INTROGRESSION OF NOVEL ALLELES FOR PARTIAL RESISTANCE TO BIG VEIN DISEASE FROM LACTUCA VIROSA INTO CULTIVATED LETTUCE

- (Peer Reviewed Journal)Hayes, R.J., Ryder, E.J. 2007. Introgression of novel alleles for partial resistance to big vein disease from lactuca virosa into cultivated lettuce. HortScience 42(1):35-39.CHARACTERIZATION OF RACE-SPECIFIC INTERACTIONS AMONG ISOLATES OF VERTICILLIUM DAHLIAE PATHOGENIC ON LETTUCE

- (Peer Reviewed Journal)Vallad, G.E., Qin, Q., Grube, R., Hayes, R.J., Subbarao, K.V. 2006. Characterization of race-specific interactions among isolates of verticillium dahliae pathogenic on lettuce. Phytopathology. 96(12):1380-1387. DOI: 10.1094/PHYTO-96-1380.THE DEVELOPMENT AND IMPACT OF VERTICILLIUM WILT ON POST-HARVEST QUALITY IN COMMERCIAL LETTUCE FIELDS NATURALLY INFESTED WITH <I>V. DAHLIAE</I>

- (Abstract Only)Vallad, G., Qin, Q., Hayes, R.J., Subbarao, K.V. 2006. The development and impact of verticillium wilt on post-harvest quality in commercial lettuce fields naturally infested with <i>v. dahliae</i>. Phytopathology.Host Resistance to Mirafiori Lettuce Big-vein Virus and Virus Sequence Diversity in the Western United States.

- (Abstract Only)Wintermantel, W.M., Hayes, R.J. 2006. Host Resistance to Mirafiori Lettuce Big-vein Virus and Virus Sequence Diversity in the Western United States.Phytopathology. 96:S124.RELEASE OF CRISPHEAD LETTUCE GERMPLASM WITH RESISTANCES TO CORKY ROOT AND LETTUCE MOSAIC

- (Germplasm Release)Mou, B., Hayes, R.J., Ryder, E.J. 2006. Release of crisphead lettuce germplasm with resistances to corky root and lettuce mosaic. Germplasm Release. Release of seven breeding lines of crisphead lettuce (Lactuca sativa L.) U.S. Dept. of Agriculture. Agri. Research Service.HOST RESISTANCE TO MIRAFIORI LETTUCE BIG-VEIN VIRUS AND LETTUCE BIG-VEIN ASSOCIATED VIRUS AND VIRUS SEQUENCE DIVERSITY AND FREQUENCY IN CALIFORNIA

- (Peer Reviewed Journal)Hayes, R.J., Wintermantel, W.M., Nicely, P.A., Ryder, E.J. Host resistance to Mirafiori lettuce big-vein virus and Lettuce big-vein associated virus and virus sequence diversity and frequency in California. Plant Disease 90:233-239. 2006.VARIATION IN HOST RESPONSES AMONG SELECT LETTUCE CULTIVARS TOWARDS DIVERSE ISOLATES OF V. DAHLIAE AND V. ALBO-ATRUM.

- (Abstract Only)Vallad, G.E., Qin, Q.M., Grube, R., Hayes, R.J., Subbarao, K.V. 2005. Variation in host responses among select lettuce cultivars towards diverse isolates of v. dahliae and v. albo-atrum. Phytopathology. v. 95. pg S106.DEVELOPMENT OF LETTUCE BREEDING LINES RESISTANT TO BATERIAL LEAF SPOT

- (Abstract Only)Hayes, R.J., Bull, C.T., Goldman, P.H., Ryder, E.J. 2005. Development of lettuce breeding lines resistant to baterial leaf spot. Hortscience. v. 40. p. 1098.IDENTIFIED RESISTANCE IN LETTUCE GERMPLASM TO VERTICILLIUM WILT CAUSED BY VERTICILLIUM DAHLIAE

- (Abstract Only)Vallad, G.E., Qin, Q.M., Grube, R., Hayes, R.J., Ryder, E.J., Subbarao, K.V. 2005. Identified resistance in lettuce germplasm to verticillium wilt caused by verticillium dahliae. Hortscience. v. 40. p. 1109.VARIATION FOR TIPBURN RESISTANCE IN LETTUCE

- (Abstract Only)Hayes, R.J. 2006. Variation for tipburn resistance in lettuce. HortScience 40:990-991.MIRAFIORI LETTUCE VIRUS (MILV) AND LETTUCE BIG VEIN VIRUS (LBVV) SEQUENCE DIVERSITY AND FREQUENCY IN CALIFORNIA AND ARIZONA LETTUCE, AND ANALYSIS OF BIG VEIN RESISTANCE

- (Abstract Only)Wintermantel, W.M., Hayes, R.J., Nicely, P.A., Ryder, E.J. 2005. Mirafiori lettuce virus (MiLV) and Lettuce Big Vein Virus (LBVV) sequence diversity and frequency in California and Arizona lettuce, and analysis of big vein resistance. Joint Conference of the International Working Groups on Legume and Vegetable Viruses Proceedings. p. 44.UNILATERAL AND BILATERAL HYBRIDIZATION BARRIERS IN INTER-SERIES CROSSES OF 4X 2EBN SOLANUM STOLONIFERUM, S. PINNATISECTUM, S. CARDIOPHYLLUM AND 2X 2EBN S. TUBEROSUM HAPLOIDS AND HAPLOID-SPECIES HYBRIDS.

- (Peer Reviewed Journal)Hayes, R.J., Dinu, I.I., Thill, C.A. 2005. Unilateral and bilateral hybridization barriers in inter-series crosses of 4x 2ebn solanum stoloniferum, s. pinnatisectum, s. cardiophyllum and 2x 2ebn s. tuberosum haploids and haploid-species hybrids. Sexual Plant Reproduction. v. 17. p. 303-311.NOVEL INTER-SERIES HYBRIDS IN THE GENUS SOLANUM.

- (Peer Reviewed Journal)INTROGRESSION OF BIG VEIN TOLERANCE FROM LACTUCA VIROSA L. INTO CULTIVATED LETTUCE (LACTUCA SATIVA L.).

- (Proceedings)Hayes, R.J., Ryder, E.J., Robinson, B.J. Introgression of big vein tolerance from lactuca virosa L. into cultivated lettuce (lactuca sativa L.) Hortscience. 2004. v. 39(4). p. 881.BREEDING LETTUCE CULTIVARS WITH HIGH RESISTANCE TO LETTUCE MOSIAC VIRUS.

- (Abstract Only)Hayes, R.J., Ryder, E.J. Breeding lettuce cultivars with high resistance to lettuce mosiac virus. Lettuce Workshop and Leafy Vegetable International Conference Proceedings. 2004. No page numbers.


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