Ramsey S Lewis

Field performance, alkaloid quantities, and transcriptome profiles of nearly isogenic tobacco lines possessing alternative allelic combinations at the Nic1, Nic2, and Myc2a loci

Shi, R., Allen, Z., Steede, T., & Lewis, R. S. (2025, June 6). BMC Genomics, Vol. 26.

Soilborne pathogen resistance and agronomic performance of tobacco DMR6 mutant lines and hybrids

Moore, S. J., Kernodle, S. P., & Lewis, R. S. (2025, July 1). Crop Science, Vol. 65.

Yield, chemistry, quality, and soilborne pathogen resistance of nearly isogenic low‐alkaloid lines of flue‐cured tobacco

Allen, Z., Kernodle, S. P., Steede, T., & Lewis, R. S. (2025, August 29). Crop Science.

A 2‐year, multi‐county survey of plant‐parasitic nematodes in North Carolina flue‐cured tobacco

Agronomy Journal, 116(3), 1492–1503.

A Comparison of Three Automated Root-Knot Nematode Egg Counting Approaches Using Machine Learning, Image Analysis, and a Hybrid Model

Plant Disease, 108(9), 2625–2629.

BBL enzymes exhibit enantiospecific preferences in the biosynthesis of pyridine alkaloids in Nicotiana tabacum L.

Phytochemistry, 232, 114363.

Engineering Sclareol Production on the Leaf Surface of Nicotiana tabacum

Journal of Agricultural and Food Chemistry, 72(24), 13812–13823.

Analysis of alkaloids and reducing sugars in processed and unprocessed tobacco leaves using a handheld near infrared spectrometer

Journal of Near Infrared Spectroscopy, 31(2), 55–62.

Effects of Recurrent Selection on Population Structure and Allele Frequencies in the M3S Maize Population

Bukan, M., Mandic, A., Kozumplik, V., Lewis, R., Simic, D., Sarcevic, H., & Liu, Y. (2023, December 27). Agriculture, Vol. 14.

Modified physiology of burley tobacco plants genetically engineered to express Yb1, a functional EGY enzyme

Shi, R., Kernodle, S. P., Steede, T. M., & Lewis, R. S. (2023, September 18). Planta, Vol. 258.

Use of exotic Nicotiana tabacum germplasm for confronting an inverse genetic correlation in flue‐cured tobacco

Lewis, R. S. (2023, March 20). Crop Science, Vol. 4.

Adding genome‐wide genotypic information to a tobacco (Nicotiana tabacum) breeding programme

Carvalho, B. L., Lewis, R., Bruzi, A. T., Pádua, J. M. V., & Ramalho, M. A. P. (2022, January 21). Plant Breeding, Vol. 1.

Analyses of diverse low alkaloid tobacco germplasm identify naturally occurring nucleotide variability contributing to reduced leaf nicotine accumulation

Burner, N., McCauley, A., Pramod, S., Frederick, J., Steede, T., Kernodle, S. P., & Lewis, R. S. (2022, January 1). Molecular Breeding, Vol. 42.

CLCNt2 Mediates Nitrate Content in Tobacco Leaf, Impacting the Production of Tobacco-Specific Nitrosamines in Cured Leaves

Bovet, L., Campanoni, P., Lu, J., Hilfiker, A., Kleinhans, S., Laparra, H., … Goepfert, S. (2022, February 16). Frontiers in Plant Science, Vol. 13.

Combined reduced expression of two gene families lowers nicotine content to ultra-low levels in cultivated tobacco

Kernodle, S. P., Webb, S., Steede, T. M., & Lewis, R. S. (2022, July 2). Plant Cell Reports, Vol. 7.

Editing of A622 genes results in ultra-low nicotine whole tobacco plants at the expense of dramatically reduced growth and development

Burner, N., Kernodle, S. P., Steede, T., & Lewis, R. S. (2022, April 1). Molecular Breeding, Vol. 42.

Editorial: Biotechnological and genomic approaches for enhancing agronomic performance of crops

Mir, R. R., Kudapa, H., Pramod, S., & Lewis, R. S. (2022, October 4). Frontiers in Genetics, Vol. 13.

Exploitation of heterosis in tobacco breeding in Brazil

Carvalho, B. L., Bruzi, A. T., Lewis, R., Pádua, J. M. V., & Ramalho, M. A. P. (2022, January 1). Crop Breeding and Applied Biotechnology, Vol. 22.

Adaptation of Phytophthora nicotianae to Multiple Sources of Partial Resistance in Tobacco

Jin, J., McCorkle, K. L., Cornish, V., Carbone, I., Lewis, R. S., & Shew, H. D. (2021, November 4). Plant Disease, Vol. 106, pp. 906–917.

Combining ability of standardized indices for multi-trait selection in tobacco

Carvalho, B. L., Lewis, R., Pádua, J. M. V., Bruzi, A. T., & Ramalho, M. A. P. (2021, January 1). Ciência e Agrotecnologia, Vol. 45.

Constitutive activation of nitrate reductase in tobacco alters flowering time and plant biomass

Lu, J., Chandrakanth, N. N., Lewis, R. S., Andres, K., Bovet, L., Goepfert, S., & Dewey, R. E. (2021, February 19). Scientific Reports, Vol. 11.

Evaluation of tobacco lines and hybrids carrying Beinhart‐1000 alleles at the Phn15.1 locus for agronomic and disease resistance characteristics

Heim, C., Ma, J., Willard, E., Shelton, C., & Lewis, R. S. (2021, April 6). Crop Science, Vol. 61, pp. 2456–2466.

Homoeologous chromosome exchange explains the creation of a QTL affecting soil‐borne pathogen resistance in tobacco

Shi, R., Jin, J., Nifong, J. M., Shew, D., & Lewis, R. S. (2021, August 28). Plant Biotechnology Journal, Vol. 10.

QTL analysis of seed germination traits in tobacco (Nicotiana tabacum L.)

Agacka-Mołdoch, M., Arif, M. A. R., Lohwasser, U., Doroszewska, T., Lewis, R. S., & Börner, A. (2021, March 5). Journal of Applied Genetics, Vol. 62, pp. 441–444.

RNAseq Reveals Differential Gene Expression Contributing to Phytophthora nicotianae Adaptation to Partial Resistance in Tobacco

Jin, J., Shi, R., Lewis, R. S., & Shew, H. D. (2021, March 30). Agronomy, Vol. 11.

Characterization of Phn15.1, a Newly Identified Phytophthora nicotianae Resistance QTL in Nicotiana tabacum

Ma, J. M., Heim, C. B., Humphry, M., Nifong, J. M., & Lewis, R. S. (2020, February 3). Plant Disease, Vol. 104, pp. 1638–1646.

Genetic and Agronomic Analysis of Tobacco Genotypes Exhibiting Reduced Nicotine Accumulation Due to Induced Mutations in Berberine Bridge Like (BBL) Genes

Lewis, R. S., Drake-Stowe, K. E., Heim, C., Steede, T., Smith, W., & Dewey, R. E. (2020, April 3). Frontiers in Plant Science, Vol. 11.

Genetics influence postharvest measurements of flue‐cured tobacco more than nitrogen application rate

Cheek, J. A., Vann, M. C., Lewis, R. S., & Fisher, L. R. (2020, December 21). Agronomy Journal, Vol. 12, pp. 1020–1028.

Identification and editing of a hybrid lethality gene expands the range of interspecific hybridization potential in Nicotiana

Ma, J., Hancock, W. G., Nifong, J. M., Kernodle, S. P., & Lewis, R. S. (2020, July 1). Theoretical and Applied Genetics, Vol. 133, pp. 2915–2925.

Agronomic Practices Affecting Nicotine Concentration in Flue‐Cured Tobacco: A Review

Henry, J. B., Vann, M. C., & Lewis, R. S. (2019, November 1). Agronomy Journal, Vol. 111, pp. 3067–3075.

Evaluating diverse systems of tobacco genetic resistance to Phytophthora nicotianae in Yunnan, China

Zeng, J. M., Nifong, J., Liu, Y., Huang, C. J., Fang, D. H., Lewis, R. S., & Li, Y. P. (2019, September 5). Plant Pathology, Vol. 68, pp. 1616–1623.

Genetic Control of Facultative Parthenocarpy in Nicotiana tabacum L.

Dexter-Boone, A., Humphry, M., Shi, R., & Lewis, R. S. (2019, April 17). Journal of Heredity, Vol. 110, pp. 610–617.

Genetic analysis of Phn7.1, a major QTL conferring partial resistance to Phytophthora nicotianae in Nicotiana tabacum

Ma, J. M., Heim, C., Humphry, M., Nifong, J. M., & Lewis, R. S. (2019, January 1). Molecular Breeding, Vol. 39.

Heterosis in Flue‐Cured Tobacco and Its Utility in Predicting Transgressive Segregation within Derived Populations of Inbred Lines

Dexter-Boone, A., & Lewis, R. S. (2019, March 14). Crop Science, Vol. 59, pp. 957–967.

Identification and validation of SNP markers associated with Wz-mediated Phytophthora nicotianae resistance in Nicotiana tabacum L.

Shi, R., Hubert, H., Dexter-Boone, A., Zeng, J., Kernodle, S. P., & Lewis, R. S. (2019, June 28). Molecular Breeding, Vol. 39.

Increasing Photosynthesis: Unlikely Solution For World Food Problem

Sinclair, T. R., Rufty, T. W., & Lewis, R. S. (2019, September 2). Trends in Plant Science, Vol. 24, pp. 1032–1039.

Filter paper-based spin column method for cost-efficient DNA or RNA purification

Shi, R., Lewis, R. S., & Panthee, D. R. (2018, December 7). PLoS ONE, Vol. 13.

Potential Mandated Lowering of Nicotine Levels in Cigarettes: A Plant Perspective

Lewis, R. S. (2018, January 29). Nicotine & Tobacco Research, Vol. 21, pp. 991–995.

A reference genome for Nicotiana tabacum enables map-based cloning of homeologous loci implicated in nitrogen utilization efficiency

Edwards, K. D., Fernandez-Pozo, N., Drake-Stowe, K., Humphry, M., Evans, A. D., Bombarely, A., … Mueller, L. A. (2017, June 7). BMC Genomics, Vol. 18.

Characterization of Phytophthora nicotianae Resistance Conferred by the Introgressed Nicotiana rustica Region, Wz, in Flue-Cured Tobacco

McCorkle, K. L., Drake-Stowe, K., Lewis, R. S., & Shew, D. (2017, September 28). Plant Disease, Vol. 102, pp. 309–317.

Heterosis, transmission genetics, and selection for increased growth rate in a N. tabacum × synthetic tobacco cross

Hancock, W. G., & Lewis, R. S. (2017, April 1). Molecular Breeding, Vol. 37.

Multiple Disease Resistance Loci Affect Soilborne Disease Resistance in Tobacco (Nicotiana tabacum)

Drake-Stowe, K., Bakaher, N., Goepfert, S., Philippon, B., Mark, R., Peterson, P., & Lewis, R. S. (2017, June 5). Phytopathology, Vol. 107, pp. 1055–1061.

The Tobacco Trichome Exudate Z-abienol and Its Relationship With Plant Resistance to Phytophthora nicotianae

Steede, W. T., Ma, J. M., Eickholt, D. P., Drake-Stowe, K. E., Kernodle, S. P., Shew, H. D., … Lewis, R. S. (2017, March 14). Plant Disease, Vol. 101, pp. 1214–1221.

Expression of a constitutively active nitrate reductase variant in tobacco reduces tobacco‐specific nitrosamine accumulation in cured leaves and cigarette smoke

Lu, J., Zhang, L., Lewis, R. S., Bovet, L., Goepfert, S., Jack, A. M., … Dewey, R. E. (2016, January 23). Plant Biotechnology Journal, Vol. 14, pp. 1500–1510.

Heat Unit Accumulation and Days to Anthesis Relationship in Tobacco Genotypes with an Introgressed QTL Affecting Leaf Number

Wells, R., Eickholt, D. P. J., Lewis, R., Vann, M. C., & Fisher, L. R. (2016, August 18). Crop Science, Vol. 56, pp. 3228–3236.

Genetic Factors for Enhancement of Nicotine Levels in Cultivated Tobacco

Wang, B., Lewis, R. S., Shi, J., Song, Z., Gao, Y., Li, W., … Qu, R. (2015, December 2). Scientific Reports, Vol. 5.

Identification of maternal haploids of Nicotiana tabacum aided by transgenic expression of green fluorescent protein: evidence for chromosome elimination in the N. tabacum × N. africana interspecific cross

Hancock, W. G., Kuraparthy, V., Kernodle, S. P., & Lewis, R. S. (2015, August 19). Molecular Breeding, Vol. 35.

Mapping quantitative trait loci determining seed longevity in tobacco (Nicotiana tabacum L.)

Agacka-Mołdoch, M., Nagel, M., Doroszewska, T., Lewis, R. S., & Börner, A. (2015, January 20). Euphytica, Vol. 202, pp. 479–486.

Transgenic and Mutation-Based Suppression of a Berberine Bridge Enzyme-Like (BBL) Gene Family Reduces Alkaloid Content in Field-Grown Tobacco

Lewis, R. S., Lopez, H. O., Bowen, S. W., Andres, K. R., Steede, W. T., & Dewey, R. E. (2015, February 17). PLoS ONE, Vol. 10.

Allopolyploidy and the evolution of plant virus resistance

Gottula, J., Lewis, R., Saito, S., & Fuchs, M. (2014, January 1). BMC Evolutionary Biology, Vol. 14.

Black Shank Resistance and Agronomic Performance of Flue‐Cured Tobacco Lines and Hybrids Carrying the Introgressed Nicotiana rustica Region, Wz

Drake, K. E., Moore, J. M., Bertrand, P., Fortnum, B., Peterson, P., & Lewis, R. S. (2014, December 22). Crop Science, Vol. 55, pp. 79–86.

Effect of an Introgressed Nicotiana tomentosa Leaf Number QTL on Yield and Quality Characteristics in Flue‐Cured Tobacco

Eickholt, D. P., & Lewis, R. S. (2014, February 27). Crop Science, Vol. 54, pp. 586–594.

(R)-nicotine biosynthesis, metabolism and translocation in tobacco as determined by nicotine demethylase mutants

Cai, B., Jack, A. M., Lewis, R. S., Dewey, R. E., & Bush, L. P. (2013, July 9). Phytochemistry, Vol. 7, pp. 188–196.

An Introgressed Nicotiana rustica Genomic Region Confers Resistance to Phytophthora nicotianae in Cultivated Tobacco

Drake, K., & Lewis, R. S. (2013, April 26). Crop Science, Vol. 53, pp. 1366–1374.

Breeding Cycles Expedited by FT‐mediated Reduction in Generation Time

Eickholt, D. P., & Lewis, R. S. (2013, September 27). Crop Science, Vol. 53, pp. 2384–2391.

Stalk rot resistance in Maksimir 3 synthetic maize population after four cycles of recurrent selection

Bukan, M., Sarcevic, H., Buhinicek, I., Palaversic, B., Lewis, R., & Kozumplik, V. (2013, January 1). Genetika, Vol. 45, pp. 921–928.

Impact of Alleles at the Yellow Burley (Yb) Loci and Nitrogen Fertilization Rate on Nitrogen Utilization Efficiency and Tobacco-Specific Nitrosamine (TSNA) Formation in Air-Cured Tobacco

Journal of Agricultural and Food Chemistry, 60(25), 6454–6461.

Long‐term Genetic Improvement and Genetic Diversity of Croatian Flue‐cured Tobacco (Nicotiana tabacum L.) Cultivars

Šarčević, H., Gunjaća, J., Budimir, A., Boić, M., Bolarić, S., Bukan, M., … Kozumplik, V. (2012, November 26). Crop Science, Vol. 53, pp. 112–120.

Development of CAPS and dCAPS markers for CYP82E4, CYP82E5v2 and CYP82E10 gene mutants reducing nicotine to nornicotine conversion in tobacco

Li, D., Lewis, R. S., Jack, A. M., Dewey, R. E., Bowen, S. W., & Miller, R. D. (2011, April 11). Molecular Breeding, Vol. 29, pp. 589–599.

Growth Chamber Evaluation of a Tobacco ‘Beinhart 1000’ × ‘Hicks’ Mapping Population for Quantitative Trait Loci Affecting Resistance to Multiple Races of Phytophthora nicotianae

Vontimitta, V., & Lewis, R. S. (2011, December 5). Crop Science, Vol. 52, pp. 91–98.

Identification of Tobacco Haploids on the Basis of Transgenic Overexpression of PAP1 from Arabidopsis thaliana

Lewis, R. S., & Rose, C. (2011, June 23). Crop Science, Vol. 51, pp. 1491–1497.

Variability for Resistance to Phytophthora nicotianae Within a Collection of Nicotiana rustica Accessions

Nifong, J. M., Nicholson, J. S., Shew, H. D., & Lewis, R. S. (2011, July 19). Plant Disease, Vol. 95, pp. 1443–1447.

Agronomic Performance of Tobacco Mosaic Virus‐Resistant Tobacco Lines and Hybrids Possessing the Resistance Gene N Introgressed on Different Chromosomes

Lewis, R. S., & Rose, C. (2010, June 8). Crop Science, Vol. 50, pp. 1339–1347.

Mapping of quantitative trait loci affecting resistance to Phytophthora nicotianae in tobacco (Nicotiana tabacum L.) line Beinhart-1000

Vontimitta, V., & Lewis, R. S. (2010, November 3). Molecular Breeding, Vol. 29, pp. 89–98.

Three nicotine demethylase genes mediate nornicotine biosynthesis in Nicotiana tabacum L.: Functional characterization of the CYP82E10 gene

Lewis, R. S., Bowen, S. W., Keogh, M. R., & Dewey, R. E. (2010, October 26). Phytochemistry, Vol. 10, pp. 1988–1998.

A method for accelerated trait conversion in plant breeding

Lewis, R. S., & Kernodle, S. P. (2009, March 5). Theoretical and Applied Genetics, Vol. 118, pp. 1499–1508.

Analysis of a Nicotiana tabacum L. Genomic Region Controlling Two Leaf Surface Chemistry Traits

Vontimitta, V., Danehower, D. A., Steede, T., Moon, H. S., & Lewis, R. S. (2009, December 16). Journal of Agricultural and Food Chemistry, Vol. 58, pp. 294–300.

Changes in Genetic Diversity of U.S. Flue‐Cured Tobacco Germplasm over Seven Decades of Cultivar Development

Moon, H. S., Nicholson, J. S., Heineman, A., Lion, K., Hoeven, R., Hayes, A. J., & Lewis, R. S. (2009, March 1). Crop Science, Vol. 49, pp. 498–508.

Microsatellite‐based Analysis of Tobacco (Nicotiana tabacum L.) Genetic Resources

Moon, H. S., Nifong, J. M., Nicholson, J. S., Heineman, A., Lion, K., Hoeven, R., … Lewis, R. S. (2009, October 23). Crop Science, Vol. 49, pp. 2149–2159.

Evaluation of Tobacco Germplasm for Seedling Resistance to Stem Rot and Target Spot Caused by Thanatephorus cucumeris

Elliott, P. E., Lewis, R. S., Shew, H. D., Gutierrez, W. A., & Nicholson, J. S. (2008, February 12). Plant Disease, Vol. 92, pp. 425–430.

RNA interference (RNAi)‐induced suppression of nicotine demethylase activity reduces levels of a key carcinogen in cured tobacco leaves

Lewis, R. S., Jack, A. M., Morris, J. W., Robert, V. J. M., Gavilano, L. B., Siminszky, B., … Dewey, R. E. (2008, February 14). Plant Biotechnology Journal, Vol. 2, pp. 346–354.

Use of transferableNicotiana tabacumL. microsatellite markers for investigating genetic diversity in the genusNicotiana

Moon, H. S., Nicholson, J. S., & Lewis, R. S. (2008, July 29). Genome, Vol. 51, pp. 547–559.

Analysis of an introgressed Nicotiana tomentosa genomic region affecting leaf number and correlated traits in Nicotiana tabacum

Lewis, R. S., Milla, S. R., & Kernodle, S. P. (2007, January 11). Theoretical and Applied Genetics, Vol. 114, pp. 841–854.

Evaluation of Nicotiana tabacum Genotypes Possessing Nicotiana africana‐derived Genetic Tolerance to Potato Virus Y

Lewis, R. S. (2007, September 1). Crop Science, Vol. 47, pp. 1975–1984.

The negative influence of N-mediated TMV resistance on yield in tobacco: linkage drag versus pleiotropy

Lewis, R. S., Linger, L. R., Wolff, M. F., & Wernsman, E. A. (2007, May 10). Theoretical and Applied Genetics, Vol. 115, pp. 169–178.

Aspects of the evolution of Nicotiana tabacum L. and the status of the United States Nicotiana Germplasm Collection

Lewis, R. S., & Nicholson, J. S. (2006, September 18). Genetic Resources and Crop Evolution, Vol. 54, pp. 727–740.

Identification of Germplasm of Possible Value for Confronting an Unfavorable Inverse Genetic Correlation in Tobacco

Lewis, R. S. (2006, June 21). Crop Science, Vol. 46, pp. 1764–1771.

Molecular and genetic characterization of N. glutinosa L. chromosome segments in tobacco mosaic virus (TMV)-resistant tobacco accessions

Crop Science, 45(6), 2355–2362.

RAPD and SCAR markers linked to an introgressed gene conditioning resistance to Peronospora tabacina D.B. Adam in tobacco

Crop Science, 45(6), 2346–2354.

Transfer of resistance to potato virus�Y (PVY) from Nicotiana africana to Nicotiana tabacum: possible influence of tissue culture on the rate of introgression

Lewis, R. S. (2005, January 26). Theoretical and Applied Genetics, Vol. 110, pp. 678–687.

Incorporation of tropical maize germplasm into inbred lines derived from temperate × temperate-adapted tropical line crosses: agronomic and molecular assessment

Lewis, R. S., & Goodman, M. M. (2003, July 12). Theoretical and Applied Genetics, Vol. 107, pp. 798–805.

Efforts to Initiate Construction of a Disease Resistance Package on a Designer Chromosome in Tobacco

Lewis, R. S., & Wernsman, E. A. (2001, September 1). Crop Science, Vol. 41, pp. 1420–1427.