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United States Department of Agriculture

Agricultural Research Service

Related Topics

Ivan Simko
Crop Improvement and Protection Research
Genetics

Phone: (831) 755-2862
Fax: (831) 755-2814

1636 E ALISAL ST
SALINAS , CA 93905

Projects
Breeding and Genetics of Lettuce for Resistance Against Race 2 Verticillium Wilt
Cooperative Agreement (A)
  Accession Number: 426231
Development of Molecular Markers for Selection of Lettuce Genotypes with Resistance to Verticillium Race 1
Cooperative Agreement (A)
  Accession Number: 430226
Genetic Enhancement of Lettuce, Spinach, Melon, and Related Species
In-House Appropriated (D)
  Accession Number: 424945
Breeding and Genetics of Lettuce for Resistance Against Race 2 Verticillium Wilt
Interagency Reimbursable Agreement (I)
  Accession Number: 425678
Development of Molecular Markers for Selection of Lettuce Genotypes with Resistance to Verticillium Race 1
Reimbursable Cooperative Agreement (R)
  Accession Number: 430107
Developing Lettuce Cultivars With Resistance to Bacterial Leaf Spot and Tospoviruses
Reimbursable Cooperative Agreement (R)
  Accession Number: 427814
Developing Lettuce Cultivars with Resistance to Bacterial Leaf Spot
Non-Assistance Cooperative Agreement (S)
  Accession Number: 428250
Lettuce Breeding and Genetics
Trust Fund Cooperative Agreement (T)
  Accession Number: 426665

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Genetics of the partial resistance against race 2 of Verticillium dahliae in lettuce -
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 -
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.
Genetic characterization of quantitative resistance to Bremia lactucae, the causal organism of lettuce downy mildew -
Parra, L., Simko, I., Michelmore, R. 2016. Genetic characterization of quantitative resistance to Bremia lactucae, the causal organism of lettuce downy mildew. American Phytopathological Society Annual Meeting. Available: http://www.apsnet.org/meetings/annual/abstracts/pages/abstractdetail.aspx?MID=550.
High-resolution DNA melting analysis in plant research -
Simko, I. 2016. High-resolution DNA melting analysis in plant research. Trends in Plant Science. 21(6):528-537.
Genetics of resistance against lettuce downy mildew -
Parra, L., Ochoa, O.E., Mchale, L.K., Christopoulou, M., Simko, I., Michelmore, R. 2016. Genetics of resistance against lettuce downy mildew. Plant and Animal Genome Conference Proceedings. Available: https://pag.confex.com/pag/xxiv/webprogram/Paper19545.html.
Assessing genetic variation in lettuce for traits related to nitrogen use efficiency using susceptibility and relative efficiency indices -
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 Reprint Icon -
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.
Application of chlorophyll fluorescence imaging and hyperspectral imaging in evaluation of decay in fresh-cut lettuce -
Simko, I., Jimenez-Berni, J.A., Furbank, R.T. 2015. Application of chlorophyll fluorescence imaging and hyperspectral imaging in evaluation of decay in fresh-cut lettuce. International Plant and Algal Phenomics Meeting, June 27-30, 2015, Prague, Czech Republic.
Breeding lettuce for fresh-cut processing -
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.
Analysis of bibliometric indicators to determine citation bias -
Simko, I. 2015. Analysis of bibliometric indicators to determine citation bias. Palgrave Communications. doi: 10.1057/palcomms.2015.11.
Resistance to downy mildew in lettuce ‘La Brillante’ is conferred by dm50 gene and multiple QTL -
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.
Detection of decay in fresh-cut lettuce using hyperspectral imaging and chlorophyll fluorescence imaging -
Simko, I., Jimenez-Berni, J.A., Furbank, R.T. 2015. Detection of decay in fresh-cut lettuce using hyperspectral imaging and chlorophyll fluorescence imaging. Postharvest Biology and Technology. 106:44–52.
Downy mildew disease promotes the colonization of romaine lettuce by Escherichia coli O157:H7 and Salmonella enterica Reprint Icon -
Simko, I., Zhou, Y., Brandl, M. 2015. Downy mildew disease promotes the colonization of romaine lettuce by Escherichia coli O157:H7 and Salmonella enterica. BMC Microbiology. 15:19. doi: 10.1186/s12866-015-0360-5.
Inheritance of decay of salad-cut lettuce in a recombinant inbred line population from ‘Salinas 88’ x ‘La Brillante’ -
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 Reprint Icon -
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 -
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.
QTL mapping, association mapping and marker assisted breeding in lettuce -
Simko, I. 2014. QTL mapping, association mapping and marker assisted breeding in lettuce. American Seed Trade Association Conference, January 23-27, 2014, Monterey, California. Available: http://biodiagnostics.net/wp-content/uploads/2014/04/Dr.-Simko-ASTA-on-Lettuce-breeding-strategies-2014.pdf.
Development of a high-density intra-specific linkage map of lettuce using genotyping by sequencing (GBS) -
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 -
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.
Identification of QTLs conferring resistance to downy mildew in legacy cultivars of lettuce -
Simko, I., Atallah, A.J., Ochoa, O., Antonise, R., Galeano, C., Truco, M.J., Michelmore, R. 2013. Identification of QTLs conferring resistance to downy mildew in legacy cultivars of lettuce. Scientific Reports. DOI:10.1038/srep02875.
Genome-wide association of 10 horticultural traits with expressed sequence tag-derived SNP markers in a collection of lettuce lines Reprint Icon -
Kwon, S.J., Simko, I., Hellier, B.C., Mou, B., Hu, J. 2013. Genome-wide association of 10 horticultural traits with expressed sequence tag-derived SNP markers in a collection of lettuce lines. The Crop Journal. 1(1):25-33. DOI: 10.1016/j.cj.2013.07.014.
Yield gains in leafy vegetables -
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 -
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.
Development of genomic SSR markers for fingerprinting lettuce (Lactuca sativa L.) cultivars and mapping genes -
Rauscher, G., Simko, I. 2013. Development of genomic SSR markers for fingerprinting lettuce (Lactuca sativa L.) cultivars and mapping genes. BMC Plant Biology. 13:11.
Marker-assisted selection for disease resistance in lettuce -
Simko, I. 2013. Marker-assisted selection for disease resistance in lettuce. In: Varshney, R.K., Tuberosa, R., editors. Translational genomics for crop breeding. Vol. I: Biotic stresses. Ames, IA: John Wiley & Sons, Inc. p. 267-289.
AUDPC and AUDPS: What is the Difference? -
Simko, I., Piepho, H. 2012. AUDPC and AUDPS: What is the Difference? Phytopathology. 102:S4.110.
Environmental factors contributing to development of lettuce dieback disease and genomic characterization of lettuce necrotic stunt virus -
Wintermantel, W.M., Simko, I. 2012. Environmental factors contributing to development of lettuce dieback disease and genomic characterization of lettuce necrotic stunt virus. Phytopathology. 102:S4.136.
Computing Integrated Ratings from Heterogeneous Phenotypic Assessments: A Case Study of Lettuce Postharvest Quality and Downy Mildew Resistance -
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.
Empirical evaluation of DArT, SNP, and SSR marker-systems for genotyping, clustering, and assigning sugar beet hybrid varieties into populations -
Simko, I., Eujayl, I.A., Van Hintum, Jl, T. 2012. Empirical evaluation of DArT, SNP, and SSR marker-systems for genotyping, clustering, and assigning sugar beet hybrid varieties into populations. Plant Science. 184:54-62.
The area under the disease progress stairs: calculation, advantage, and application -
Simko, I., Piepho, H. 2012. The area under the disease progress stairs: calculation, advantage, and application. Phytopathology. 102:381-389.
Developing lettuce with improved quality for processed salads. -
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.
Mapping dominant negative mutation for triforine sensitivity in lettuce and its use as a selectable marker for detecting hybrids. -
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.
Combining phenotypic data from ordinal rating scales in multiple plant experiments -
Simko, I., Piepho, H. 2011. Combining phenotypic data from ordinal rating scales in multiple plant experiments. Trends in Plant Science. 16:235-237.
Application of Hi-Res Melting Approach for Mapping Resistance Genes and Marker-assisted Selection in Lettuce -
Simko, I. 2011. Application of Hi-Res Melting Approach for Mapping Resistance Genes and Marker-assisted Selection in Lettuce. Plant and Animal Genome Conference. Online.
Iceberg lettuce breeding lines with resistance to Verticillium wilt caused by race 1 isolates of Verticillium dahliae. -
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.
Evaluation of the RPi-ber late blight resistance gene for tuber resistance in the field and laboratory. -
Mayton, H., Rauscher, G., Simko, I., Fry, W. 2011. Evaluation of the RPi-ber late blight resistance gene for tuber resistance in the field and laboratory. Plant Breeding. 130:464-468.
Combining partially ranked data in plant breeding and biology: II. Analysis with Rasch model. -
Simko, I., Lincare, J.M. 2010. Combining partially ranked data in plant breeding and biology: II. Analysis with Rasch model.. Communications in Biometry and Crop Science (CBCS). 2010, Vol 5, Pages 56-65.
Combining partially ranked data in plant breeding and biology: I. Rank aggregating methods. Reprint Icon -
Simko, I., Pechenick, D.A. 2010. Combining partially ranked data in plant breeding and biology: I. Rank aggregating methods.. Communications in Biometry and Crop Science (CBCS), Year 2010, volume 5, pages 41-55.
SM09A and SM09B: Romaine Lettuce Breeding Lines Resistant to Dieback and with Improved Shelf-life. -
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.
Association mapping and marker-assisted selection of the lettuce dieback resistance gene Tvr1. -
Simko, I., Pechenick, D.A., Mchale, L.K., Truco, M.J., Ochoa, O.E., Michelmore, R.W., Scheffler, B.E. 2009. Association mapping and marker-assisted selection of the lettuce dieback resistance gene Tvr1.. Biomed Central (BMC) Plant Biology, Year 2009, volume 9, article number 135.
Development of molecular markers for marker-assisted selection in lettuce (Lactuca sativa). -
Simko, I., Pechenick, D.A., Mchale, L.K., Truco, M.J., Ochoa, O.E., Michelmore, R.W., Scheffler, B.E. 2010. Development of molecular markers for marker-assisted selection in lettuce (Lactuca sativa). Acta Horticulture Proceedings, Year 2010, volume 859, pages 401-408.
QTL mapping of resistance to Powdery Mildew in lettuce. Reprint Icon -
Rauscher, G.M., Hayes, R.J., Simko, I. 2009. QTL mapping of resistance to Powdery Mildew in lettuce. Phytopathology 99:S107.
Development of molecular markers for marker-assisted selection in lettuce (Lactuca sativa). -
FOLIAR AND TUBER BLIGHT RESISTANCE IN A SOLANUM TUBEROSUM BREEDING LINES. -
Mayton, H., Griffiths, H., Simko, I., Cheng, S., Lorenzen, J., De Jong, W., Fry, W.E. 2009. FOLIAR AND TUBER BLIGHT RESISTANCE IN A SOLANUM TUBEROSUM BREEDING LINES.. Plant Breeding.DOI:10.1111/J.1439-0523.01671.x
Association analysis of beet curly top disease resistant genes in sugarbeet -
Eujayl, I.A., Simko, I., Strausbaugh, C.A. 2009. Association analysis of beet curly top disease resistant genes in sugarbeet [Abstract]. Proceedings of 35th Biennial Meeting of American Society of Sugar Beet Technologists: Section B&E. Paper No. 1.
Development of EST-SSR Markers for the Study of Population Structure in Lettuce (Lacutca sativa L.). -
Simko, I. 2009. Development of EST-SSR Markers for the Study of Population Structure in Lettuce (Lacutca sativa L.). Journal of Heredity 180: 256-262.
Effect of Isolate, Environment and a Defeated R-gene (RPi-ber) on Quantitative Resistance of Potato to Late Blight -
Rauscher, G.M., Mayton, H., Bonierbale, M., Simko, I., Smart, C., Grunwald, N.J., Fry, W. Effect of Isolate, Environment and a Defeated R-gene (RPi-ber) on Quantitative Resistance of Potato to Late Blight. American Phytopathological Society Annual Meeting, Minneapolis, Minnesota, July 26-July 30. Phytopathology 98:S130.
MAPPING LOCI FOR CHLOROSIS ASSOCIATED WITH CHLOROPHYLL B DEFICIENCY IN POTATO -
Simko, I., Van Den Berg, J.H., Vreugdenhil, D., Ewing, E.E. 2008. Mapping loci for chlorosis associated with chlorophyll b deficiency in potato. Euphytica Vol 162, Pages 99-107, 2008.
Populations structure in cultivated lettuce (Lactuca sativa L.) and its impact on assocation mapping. -
Simko, I., Hu, J. Populations structure in cultivated lettuce (Lactuca sativa L.) Journal of the American Society for Horticultural Science, Vol. 133, Pages 61-68, 2008.
Comparison of the two pathogenic systems: Bremia Lactucae on Lactuca, and Phytophthora infestans on Solarum -
Simko, I. 2007. Comparison of the two pathogenic systems: Bremia Lactucae on Lactuca, and Phytophthora infestans on Solarum. Downy Mildews 2nd International Symposium. Olomouc, Czech Republic, July 2-7, 2007.
From Association Mapping to Marker-Assisted Selection: Experimental Design and Application. -
Simko, I. 2007. From Association Mapping to Marker-Assisted Selection: Experimental Design and Application. Phytopathology 97:S149..
Effect of Population Structure on Association Mapping in Cultivated Lettuce. -
Simko, I., Hu, J. 2007. Effect of Population Structure on Association Mapping in Cultivated Lettuce. In Eucarpia Leafy Vegetables 2007 Conference Abstracts. Warwick, UK, April 18-20, 2007.
Foliar and tuber late blight resistance in a Solanum tuberosum potato mapping population -
Mayton, H., Simko, I., Dejong, W., Fry, W. 2006. Foliar and tuber late blight resistance in a Solanum tuberosum potato mapping population. American Phytopathological Society Annual Meeting, Quebec City, Canada, July 29-August 2, 2006. Phytopathology 96:S74.
CHARACTERIZATION AND MAPPING OF RPI-BER, A NOVEL POTATO LATE BLIGHT RESISTANCE GENE FROM SOLANUM BERTHAULTII -
Rancher, G., Smart, C.D., Simko, I., Bonierbale, M., Mayton, H., Greenland, A., Fry, W.E. 2006. Characterization and mapping of rpi-ber, a novel potato late blight resistance gene from solanum berthaultii. Theoretical and Applied Genetics. 112(4):674-687.
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Last Modified: 5/2/2016
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