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United States Department of Agriculture

Agricultural Research Service

Daniel P. Roberts

Research Leader


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Characterization of apoplast phenolics: Invitro oxidation of acetosyringone results in a rapid prolonged increase in the redox potential - (Peer Reviewed Journal)
Baker, C.J., Mock, N.M., Whitaker, B.D., Hammond, R., Roberts, D.P., Nemchinov, L.G., Aver'Yanov, A.A. 2014. Characterization of apoplast phenolics: Invitro oxidation of acetosyringone results in a rapid prolonged increase in the redox potential. Physiological and Molecular Plant Pathology. 86:57-63.
Microbial community structure and abundance in the rhizosphere and bulk soil of a tomato cropping system that includes cover crops - (Peer Reviewed Journal)
Maul, J.E., Buyer, J.S., Lehman, R.M., Culman, S., Blackwood, C., Roberts, D.P., Zasada, I.A., Teasdale, J.R. 2014. Microbial community structure and abundance in the rhizosphere and bulk soil of a tomato cropping system that includes cover crops. Applied Soil Ecology. 77:42-50. DOI: 10.1016/j.apsoil.2014.01.002.
Formulations of Bacillus subtilis BY-2 suppress Sclerotinia sclerotiorum on oilseed rape in the field - (Peer Reviewed Journal)
Hu, X., Roberts, D.P., Xie, L., Maul, J.E., Yu, C., Li, Y., Jing, M., Liao, X., Che, Z., Liao, X. 2014. Formulations of Bacillus subtilis BY-2 suppress Sclerotinia sclerotiorum on oilseed rape in the field. Biological Control. 70:54-64.
Bacillus megaterium A6 suppresses Sclerotinia sclerotiorum on oilseed rape in the field and promotes oilseed rape growth - (Peer Reviewed Journal)
Hu, X., Roberts, D.P., Xie, L., Maul, J.E., Yu, C., Li, Y., Zhang, S., Liao, X. 2013. Bacillus megaterium A6 suppresses Sclerotinia sclerotiorum on oilseed rape in the field and promotes oilseed rape growth. Crop Protection. 52:151-158.
Development of a biologically based fertilizer, incorporating Bacillus megaterium A6, for improved phosphorus nutrition of oilseed rape - (Peer Reviewed Journal)
Hu, X., Roberts, D.P., Xie, L., Maul, J.E., Yu, C., Li, Y., Zhang, S., Liao, X. 2013. Development of a biologically based fertilizer, incorporating Bacillus megaterium A6, for improved phosphorus nutrition of oilseed rape. Canadian Journal of Microbiology. 59:231-236.
Real-time monitoring of the extracellular redox potential of cell suspensions during plant/bacterial interactions - (Peer Reviewed Journal)
Baker, C.J., Kovalskaya, N.Y., Mock, N.M., Deahl, K.L., Owens, R.A., Whitaker, B.D., Roberts, D.P., Hammond, R., Averyanov, A.A. 2013. Real-time monitoring of the extracellular redox potential of cell suspensions during plant/bacterial interactions. Physiological and Molecular Plant Pathology. 82:20-27.
Genes expressed by the biological control bacterium Pseudomonas protegens Pf-5 on seed surfaces under the control of the global regulators GacA and RpoS - (Peer Reviewed Journal)
Kidarsa, T.A., Shaffer, B.T., Goebel, N.C., Roberts, D.P., Buyer, J.S., Johnson, A., Kobayashi, D.Y., Paulsen, I., Loper, J.E. 2013. Genes expressed by the biological control bacterium Pseudomonas protegens Pf-5 on seed surfaces under the control of the global regulators GacA and RpoS. Environmental Microbiology. 15:716-735.
Gene expression profiling of the plant pathogenic basidiomycetous fungus Rhizoctonia solani AG 4 reveals putative virulence factors - (Peer Reviewed Journal)
Lakshman, D.K., Roberts, D.P., Alkharouf, N., Mitra, A., Natarajan, S.S. 2012. Gene expression profiling of the plant pathogenic basidiomycetous fungus Rhizoctonia solani AG 4 reveals putative virulence factors. Phytopathology. 104(5):1020-1035.
Effect of overexpressing rsmA from Pseudomonas aeruginosa on virulence of select phytotoxin-producing strains of P. syringae - (Peer Reviewed Journal)
Kong, H., Roberts, D.P., Patterson, C.D., Kuehn, S., Heeb, S., Lakshman, D.K., Lydon, J. 2012. Effect of overexpressing rsmA from Pseudomonas aeruginosa on virulence of select phytotoxin-producing strains of P. syringae. Phytopathology. 102:575-587.
An internal standard technique for improved quantitative analysis of apoplastic metabolites in tomato leaves - (Peer Reviewed Journal)
Baker, C.J., Kovalskaya, N.U., Mock, N.M., Owens, R.A., Deahl, K.L., Whitaker, B.D., Roberts, D.P., Hammond, R., Averyanov, A.A. 2012. An internal standard technique for improved quantitative analysis of apoplastic metabolites in tomato leaves. Physiological and Molecular Plant Pathology. 78:31-37.
Formulations of the endophytic bacterium Bacillus subtilis Tu-100 suppress Sclerotinia sclerotiorum on oilseed rape and improve plant vigor in field trials conducted at separate locations - (Peer Reviewed Journal)
Hu, X., Roberts, D.P., Maul, J.E., Emche, S.E., Liao, X., Gao, X., Gao, Y., Mckenna, L.F., Buyer, J.S., Liu, S. 2011. Formulations of the endophytic bacterium Bacillus subtilis Tu-100 suppress Sclerotinia sclerotiorum on oilseed rape and improve plant vigor in field trials conducted at separate locations. Canadian Journal of Microbiology. 57(7): 539-546.
Detection of bacterial aggregation in cell suspensions treated with pathogenic bacteria - (Peer Reviewed Journal)
Baker, C.J., Owens, R.A., Whitaker, B.D., Mock, N.M., Deahl, K.L., Roberts, D.P., Orlandi, E., Averyanov, A.A. 2011. Detection of bacterial aggregation in cell suspensions treated with pathogenic bacteria. Physiological and Molecular Plant Pathology. 75:170-175.
Evaluation of efficacy of microbial biological control agents - commercially acceptable control levels - (Proceedings) - (10-Feb-11)
Endophytic Trichoderma isolates from tropical environments delay disease onset and induce resistance against Phytophthora capsici in hot pepper using multiple mechanisms - (Peer Reviewed Journal)
Bae, H., Roberts, D.P., Lim, H.S., Strem, M.D., Park, S., Ryu, C., Melnick, R., Bailey, B.A. 2011. Endophytic Trichoderma isolates from tropical environments delay disease onset and induce resistance against Phytophthora capsici in hot pepper using multiple mechanisms. Molecular Plant-Microbe Interactions. 24:336-351.
Mutation of a degS homologue in Enterobacter cloacae decreases colonization and biological control of damping-off caused by Pythium ultimum on cucumber - (Peer Reviewed Journal)
Roberts, D.P., Lohrke, S.M., Mckenna, L.F., Lakshman, D.K., Kong, H.N., Lydon, J. 2011. Mutation of a degS homologue in Enterobacter cloacae decreases colonization and biological control of damping-off caused by Pythium ultimum on cucumber. Microbiology. 101:271-280.
Impact of the Spatial Heterogeneity of the Spermosphere and Rhizosphere on Performance of Bacterial Biological Control Agents - (Book / Chapter)
Roberts, D.P., Kobayashi, D.Y. 2011. Impact of the Spatial Heterogeneity of the Spermosphere and Rhizosphere on Performance of Bacterial Biological Control Agents. In: Maheshwari, D.K., editor. Bacteria in Agrobiology: Crop Ecosystems. Berlin Heidelberg: Springer. p. 111-130.
Selection of genetically diverse trichoderma spp. isolates for suppression of phytophthora capsici on bell pepper - (Peer Reviewed Journal)
Roberts, D.P., Maul, J.E., Mckenna, L.F., Emche, S.E., Meyer, S.L., Collins, R.T., Bowers, J.H. 2010. Selection of genetically diverse trichoderma spp. isolates for suppression of phytophthora capsici on bell pepper. Canadian Journal of Microbiology. 56:864-873.
Effect of viroid infection on the dynamics of phenolic metabolites in the apoplast of tomato Reprint Icon - (Peer Reviewed Journal)
Baker, C.J., Owens, R.A., Whitaker, B.D., Mock, N.M., Deahl, K.L., Roberts, D.P., Averyanov, A.A. 2010. Effect of viroid infection on the dynamics of phenolic metabolites in the apoplast of tomato. Physiological and Molecular Plant Pathology. 74:214-220.
Factors Affecting Soil Microbial Community Structure in Tomato Cropping Systems Reprint Icon - (Peer Reviewed Journal)
Buyer, J.S., Teasdale, J.R., Roberts, D.P., Zasada, I.A., Maul, J.E. 2010. Factors Affecting Soil Microbial Community Structure in Tomato Cropping Systems. Soil Biology and Biochemistry. 42:831-841.
Factors Affecting Soil Microbial Community Structure in Tomato Cropping Systems Reprint Icon - (Peer Reviewed Journal)
Buyer, J.S., Teasdale, J.R., Roberts, D.P., Zasada, I.A., Maul, J.E. 2010. Factors Affecting Soil Microbial Community Structure in Tomato Cropping Systems. Soil Biology and Biochemistry. 42:831-841.
Reduced carbon utilization, competitive colonization of the spermosphere, and disease suppression by Enterobacter cloacae - (Abstract Only)
Roberts, D.P., Mckenna, L.F., Buyer, J.S. 2009. Reduced carbon utilization, competitive colonization of the spermosphere, and disease suppression by Enterobacter cloacae [abstract]. International Plant Growth Promoting Rhizobacteria Workshop.
Differential induction of redox sensitive extracellular phenolic amides in potato - (Peer Reviewed Journal)
Baker, C.J., Whitaker, B.D., Mock, N.M., Rice, C., Roberts, D.P., Deahl, K.L., Ueng, P.P., Aver'Yanov, A.A. 2009. Differential induction of redox sensitive extracellular phenolic amides in potato. Physiological and Molecular Plant Pathology. 73:109-115.
Influence of host seed on metabolic activity by Enterobacter cloacae in the spermosphere Reprint Icon - (Peer Reviewed Journal)
Roberts, D.P., Baker, C.J., Mckenna, L.F., Liu, S., Buyer, J.S., Kobayashi, D.Y. 2009. Influence of host seed on metabolic activity by Enterobacter cloacae in the spermosphere. Soil Biology and Biochemistry. 41:754-761.
Suppression of Phytophthora capsici on bell pepper with isolates of Trichoderma - (Abstract Only)
Roberts, D.P., Mckenna, L.F. 2008. Suppression of Phytophthora capsici on bell pepper with isolates of Trichoderma [abstract]. Proceedings of International Research Conference on Methyl Bromide Alternatives.
Evidence that a DEGS homologue in Enterobacter clocae is important for colonization and disease suppression on cucumber - (Abstract Only)
Roberts, D.P., Lohrke, S.M., Mckenna, L.F., Lakshman, D.K. 2008. Evidence that a DEGS homologue in Enterobacter clocae is important for colonization and disease suppression on cucumber [abstract]. Microbial Ecology International Symposium.
Effects of cover cropping on soil and rhizosphere microbial community structure in tomato production systems - (Abstract Only)
Buyer, J.S., Zasada, I.A., Roberts, D.P., Teasdale, J.R. 2008. Effects of cover cropping on soil and rhizosphere microbial community structure in tomato production systems [abstract]. Microbial Ecology International Symposium. p. 51.
Isolation and Partial Characterization of Bacillus Subtilis Me488 for Suppression of Soilborne Pathogens of Cucumber and Pepper - (Peer Reviewed Journal)
Chung, S., Kong, H., Buyer, J.S., Lakshman, D.K., Lydon, J., Kim, S., Roberts, D.P. 2008. Isolation and partial characterization of bacillus subtilis me488 for suppression of soilborne pathogens of cucumber and pepper. Applied Microbiology and Biotechnology. 80(1):115-23.
Metabolic behavior of bacterial biological control agents in soil and plant rhizospheres - (Peer Reviewed Journal)
Pielach, C.A., Roberts, D.P., Kobayashi, D.Y. 2008. Metabolic behavior of bacterial biological control agents in soil and plant rhizospheres. Advances in Applied Microbiology. 65:199-215.
Effects of Cover Cropping and Plasticulture on Soil and Rhizosphere Microbial Community Structure in Tomato Production Systems - (Abstract Only)
Buyer, J.S., Roberts, D.P., Zasada, I.A., Teasdale, J.R. 2007. Effects of cover cropping and plasticulture on soil and rhizosphere microbial community structure in tomato production systems [abstract]. ASA-CSSA-SSSA Annual Meeting Abstracts.
Isolation and Identification of Mycoparasitic Isolates of Trichoderma Asperellum with Potential for Supression of Black Pod Disease of Cacao in Cameroon - (Peer Reviewed Journal)
Tondje, P., Roberts, D.P., Bon, M., Widmer, T., Samuels, G.J., Ismaiel, A.A., Begoude, A.D., Tchana, T., Nyemb-Tshomb, E., Ndoumbe-Nkeng, M., Bateman, R., Fontem, D., Hebbar, K.P. 2007. Isolation and identification of mycoparasitic isolates of trichoderma asperellum with potential for supression of black pod disease of cacao in cameroon. Biological Control. 43:202-212.
Isolation and identification of mycoparasitic isolates of Trichoderma asperellum with potential for suppression of black pod disease of cacao in Cameroon - (Peer Reviewed Journal)
Tondje, P., Roberts, D.P., Bon, M., Widmer, T.L., Samuels, G.J., Ismaiel, A.A., Begoude, A., Tchana, T., Nyemb-Tshomb, E., Ndoumbe-Nkeng, M., Bateman, D., Fontem, D., Hebbar, K. 2007. Isolation and identification of mycoparasitic isolates of Trichoderma asperellum with potential for suppression of black pod disease of cacao in Cameroon. Biocontrol.
Mutation in a Degs Homologue in Enterobacter Cloacae Results in Decreased Seedling and Root Colonization by This Bacterium - (Abstract Only)
Roberts, D.P., Lohrke, S.M., Lakshman, D.K., Mckenna, L.F. 2007. Mutation in a degs homologue in enterobacter cloacae results in decreased seedling and root colonization by this bacterium [abstract]. International Congress on Molecular Plant-Microbe Interactions.
Effects of RsmA on phytotoxin production by Pseudomonas syringae pathovars - (Abstract Only)
Kong, H., Patterson, C.D., Roberts, D.P., Heeb, S., Kuehne, S., Lydon, J. 2007. Effects of rsma on phytotoxin production by pseudomonas syringae pathovars [abstract]. American Society for Microbiology. p. 88.
Improved biocontrol of fruit decay fungi with Pichia pastoris recombinant strains expressing Psd1 antifungal peptide - (Peer Reviewed Journal)
Janisiewicz, W.J., Pereira, I., Almeida, M.S., Roberts, D.P., Wisniewski, M.E., Kurtenbach, E. 2008. Improved biocontrol of fruit decay fungi with Pichia pastoris recombinant strains expressing Psd1 antifungal peptide. Postharvest Biology and Technology. 47:218-225.
Role of sdhA and pfkA and catabolism of reduced carbon during colonization of cucumber roots by Enterobacter cloacae Reprint Icon - (Peer Reviewed Journal)
Liu, S., Hu, X., Lohrke, S.M., Baker, C.J., Buyer, J.S., De Souza, J.T., Roberts, D.P. 2007. Role of sdhA and pfkA and catabolism of reduced carbon during colonization of cucumber roots by Enterobacter cloacae. Microbiology. 153:3197-3210.
Suppression of Damping-off of Cucumber Caused by Pythium Ultimum with Live Cells and Extracts of Serratia Marcescens N4-5 - (Peer Reviewed Journal)
Roberts, D.P., Mckenna, L.F., Lakshman, D.K., Meyer, S.L., Kong, H.N., De Souza, J.T., Lydon, J., Baker, C.J., Buyer, J.S., Chung, S. 2007. Suppression of damping-off of cucumber caused by pythium ultimum with live cells and extracts of serratia marcescens n4-5. Soil Biology and Biochemistry. 39:2275-2288.
Pyruvate Dehydrogenase Activity Is Important for Colonization of Seeds and Roots by Enterobacter Cloacae - (Peer Reviewed Journal)
Roberts, D.P., Mckenna, L.F., Lohrke, S.M., Rehner, S.A., De Souza, J.T. 2007. Pyruvate dehydrogenase activity is important for colonization of seeds and roots by enterobacter cloacae. Soil Biology and Biochemistry. 39:2150-2159.
Interference by morpholine ethanesulfonic acid (MES) and related buffers in phenolic oxidation by peroxidase - (Peer Reviewed Journal)
Baker, C.J., Mock, N.M., Roberts, D.P., Deahl, K.L., Hapeman, C.J., Schmidt, W.F., Kochansky, J.P. 2007. Interference by morpholine ethanesulfonic acid (MES) and related buffers in phenolic oxidation by peroxidase. Biochemical and Biophysical Research Communications. 43:1322-1327.
Use of Natural Products for Suppression of Soilborne Diseases of Cucumber - (Abstract Only)
Roberts, D.P., Mckenna, L.F. 2006. Use of natural products for suppression of soilborne diseases of cucumber. International Conference on Methyl Bromide Alternatives and Emissions Reductions. Available: http://www.mbao.org/2006/06Proceedings/mbrpro06.html.
Effects of Cover Cropping and Plasticulture on Soil and Rhizosphere Microbial Community Structure in Tomato Production Systems - (Abstract Only)
Buyer, J.S., Roberts, D.P., Zasada, I.A., Teasdale, J.R. 2006. Effects of cover cropping and plasticulture on soil and rhizosphere microbial community structure in tomato production systems [abstract]. ASA-CSSA-SSSA Annual Meeting Abstracts.
Mutation in Cyaa in Enterobacter Cloacae Decreases Cucumber Root Colonization - (Peer Reviewed Journal)
Roberts, D.P., Mckenna, L.F., Hu, X., Lohrke, S.M., Kong, H.N., De Souza, J.T., Baker, C.J., Lydon, J. 2006. Mutation in cyaa in enterobacter cloacae decreases cucumber root colonization. Archives Of Microbiology. 187:101-115.
Plantago Lanceolata and Plantago Rugelii Extracts Are Toxic to Meloidogyne Incognita But Not to Certain Microbes - (Peer Reviewed Journal)
Meyer, S.L., Zasada, I.A., Roberts, D.P., Vinyard, B.T., Lakshman, D.K., Lee, J., Chitwood, D.J., Carta, L.K. 2006. Plantago lanceolata and plantago rugelii extracts are toxic to meloidogyne incognita but not to certain microbes. Journal of Nematology 38(3):333-338.
Influence of Catabolic Capabilities of Enterobacter Cloacae on Colonization of Cucumber Rhizosphere by This Bacterium - (Abstract Only)
Roberts, D.P., Mckenna, L.F., Lohrke, S.M., Buyer, J.S., Liu, S., Hu, X., De Souza, J.T. 2006. Influence of catabolic capabilities of enterobacter cloacae on colonization of cucumber rhizosphere by this bacterium [abstract]. International Plant Growth Promoting Rhizobacteria Workshop.
Biocontrol Activity of Recombinant Pichia Pastoris Constitutively Expressing Pea Defensin Against Blue Mold of Apple - (Abstract Only)
Janisiewicz, W.J., Pereira, I.B., Almeida, M.S., Roberts, D.P., Wisniewski, M.E., Kurtenbach, E. 2006. Biocontrol activity of recombinant Pichia pastoris constitutively expressing pea defensin against blue mold of apple. Phytopathology. 96:S53.
Apoplastic Redox Metabolism: Synergistic Phenolic Oxidation - (Peer Reviewed Journal)
Baker, C.J., Roberts, D.P., Whitaker, B.D., Mock, N.M., Deahl, K.L., Aver'Yanov, A.A. 2005. Apoplastic redox metabolism: synergistic phenolic oxidation and a novel oxidative burst. Physiological and Molecular Plant Pathology. 67:296-303.
Fungal and Plant Gene Expression During the Colonization of Theobroma Cacao Seedlings by Isolates of Four Trichoderma Species - (Peer Reviewed Journal)
Bailey, B.A., Bae, H., Strem, M.D., Roberts, D.P., Thomas, S.E., Samuels, G.J., Choi, I., Holmes, K.A. 2006. Fungal and plant gene expression during the colonization of theobroma cacao seedlings by isolates of four trichoderma species. Planta. 224(6):1449-1464.
Plant-Derived Compounds Active Against Meloidogyne Incognita - (Abstract Only)
Meyer, S.L., Zasada, I.A., Roberts, D.P., Vinyard, B.T., Lakshman, D.K., Lee, J.K., Chitwood, D.J., Carta, L.K. 2006. Plant-derived compounds active against meloidogyne incognita [abstract]. Journal of Nematology. 38:283.
Mutation of a Cyaa Homologue in Enterobacter Cloacae Results in Reduced Colonization of Cucumber Seedlings and Roots - (Abstract Only)
Roberts, D.P., Hu, X., Mckenna, L.F., Lohrke, S., Kong, H.N., Desouza, J.T., Lydon, J. 2006. Mutation of a cyaa homologue in enterobacter cloacae results in reduced colonization of cucumber seedlings and roots [abstract]. International Union of Microbiological Societies Proceedings/Abstracts.
Biologically Based Technologies for the Suppression of Soilborne Pathogens of Vegetables - (Review Article)
Roberts, D.P., Abdul Baki, A.A., Zasada, I.A., Meyer, S.L., Waldy, K. 2005. Biologically based technologies for the suppression of soilborne pathogens of vegetables. Review Article. Recent Res. Develop. Applied Microbiol. Biotechnol. 2:51-67.
Differential Induction of Extracellular Bioactive Phenolics That Are Redox Sensitive - (Peer Reviewed Journal)
Baker, C.J., Whitaker, B.D., Mock, N.M., Rice, C., Deahl, K.L., Roberts, D.P., Ueng, P.P., Averyanov, A.A. 2005. Differential induction of extracellular bioactive phenolics that are redox sensitive. Physiological and Molecular Plant Pathology. 66:90-98.
Effects of N-Viro Soil(tm), Calcium Hydroxide, and a Streptomyces Sp. on Meloidogyne Incognita Populations on Cantaloupe - (Abstract Only)
Meyer, S.L., Zasada, I.A., Tenuta, M., Roberts, D.P. 2005. Effects of n-viro soil(tm), calcium hydroxide, and a streptomyces sp. on meloidogyne incognita populations on cantaloupe. Phytopathology (Supplement). 95:S70.
Application of a Biosolid Soil Amendment, Calcium Hydroxide, and Streptomyces Sp. for Management of Root-Knot Nematode on Cantaloupe - (Peer Reviewed Journal)
Meyer, S.L., Zasada, I.A., Tenuta, M., Roberts, D.P. 2005. Application of a biosolid soil amendment, calcium hydroxide, and streptomyces sp. for management of root-knot nematode on cantaloupe. Hortechnology 15(3): 635-641.
Decreased Incidence of Disease Caused by Sclerotinia Sclerotiorum and Improved Plant Vigor of Oilseed Rape with Bacillus Subtilis Tu-100 - (Peer Reviewed Journal)
Hu, X., Roberts, D.P., Jiang, M., Zhang, Y. 2005. Decreased incidence of disease caused by Sclerotinia sclerotiorum and improved plant vigor of oilseed rape with Bacillus subtilis Tu-100. Applied Microbiology and Biotechnology. 68:802-807.
Involvement of Acetosyringone in Plant/pathogen Recognition - (Peer Reviewed Journal)
Baker, C.J., Mock, N.M., Whitaker, B.D., Roberts, D.P., Rice, C., Deahl, K.L., Averyanov, A.A. 2005. Involvement of Acetosyringone in plant/pathogen recognition. Biochemical and Biophysical Research Communications. 328:130-136.
Biocontrol Agents Applied Individually and in Combination for Suppression of Soilborne Diseases of Cucumber - (Peer Reviewed Journal)
Roberts, D.P., Lohrke, S.M., Meyer, S.L., Buyer, J.S., Bowers, J.H., Baker, C.J., Li, W., Desouza, J., Lewis, J.A., Chung, S. 2005. Biocontrol agents applied individually and in combination for suppression of soilborne diseases of cucumber. Crop Protection. 24:135-141.
Stimulatory Effect of Acetosyringone on Plant/pathogen Recognition - (Abstract Only)
Baker, C.J., Whitaker, B.D., Mock, N.M., Rice, C., Roberts, D.P., Deahl, K.L., Averyanov, A.A. 2004. Stimulatory effect of acetosyringone on plant/pathogen recognition. Free Radical Biology and Medicine.
Use of a Luxgfp Bioreporter System to Determine Metabolic Activity of An Antagonist in Fruit Wounds - (Abstract Only)
Janisiewicz, W.J., Bassett, C.L., Wisniewski, M.E., Conway, W.S., Roberts, D.P. Use of a luxgfp bioreporter system to determine metabolic activity of an antagonist in fruit wounds. American Phytopathological Society Abstracts.Abstract to be presented at Annual Meeting of the American Phytopathological Society, July 31 - August 4, 2004 in Anaheim, CA.
Induction of Redox Sensitive Extracellular Phenolics During Plant-Bacterial Interactions - (Peer Reviewed Journal)
Baker, C.J., Whitaker, B.D., Mock, N.M., Rice, C., Roberts, D.P., Deahl, K.L., Averyanov, A.A. 2005. Induction of redox sensitive extracellular phenolics during plant-bacterial interactions. Physiological and Molecular Plant Pathology. 66:90-98.
Metabolic Activity of Enterobacter Cloacae in Cucumber and Pea Spermosphere - (Abstract Only) - (01-Apr-04)
A Novel Noninvasive Technique to Monitor Real-Time Oxygen Uptake During Seed Germination - (Peer Reviewed Journal)
Baker, C.J., Roberts, D.P., Mock, N.M., Blount, V.L. 2004. A novel noninvasive technique to monitor real-time oxygen uptake during seed germination. Seed Science Research. 14:17-26.
Increased Incidence of Erwinia Soft-Rot on Calla Lilies in the Presence of Phosphorus - (Peer Reviewed Journal)
Gracia-Garza, J.A., Blom, T.J., Brown, W., Roberts, D.P., Schneider, K., Freisen, M., Gombert, D. 2004. Increased incidence of erwinia soft-rot on calla lilies in the presence of phosphorus. European Journal of Plant Pathology. 110:293-298.
Mutation of a Degs Homolog in Enterobacter Cloacae Decreases Seed and Root Colonization But Does Not Affect Biocontrol of Damping-off Caused by Pythium Ultimum on Cucumber - (Abstract Only) - (15-May-03)
Colonization of Subterranean Plant Surfaces and Suppression of Soilborne Plant Pathogens: Studies with Enterobacter Cloacae - (Peer Reviewed Journal)
Roberts, D.P., Lohrke, S.M., Buyer, J.S., Baker, C.J., Liu, S. 2003. Colonization of subterranean plant surfaces and suppression of soilborne plant pathogens: Studies with Enterobacter cloacae. Recent Research in Develop. Microbiology. 7:161-174.
Rhizosphere Colonization of Oilseed Rape by Pseudomonas Alcaligenes A9(lacz) - (Peer Reviewed Journal)
Hu, X., Liu, S., Roberts, D.P. 2002. Rhizosphere colonization of oilseed rape by pseudomonas alcaligenes a9(lacz). Chinese Journal of Oil Crops Sciences. 24:54-56.
A Novel Technique to Monitor Oxygen Consumption During Early Stages of Seed Germination - (Abstract Only) - (15-Oct-02)
Soil and Plant Effects on Microbial Community Structure - (Peer Reviewed Journal)
BUYER, J.S., ROBERTS, D.P., RUSSEK-COHEN, E. SOIL AND PLANT EFFECTS ON MICROBIAL COMMUNITY STRUCTURE. CANADIAN JOURNAL OF MICROBIOLOGY. 48:955-964. 2002.
Ahl-Deficient Mutants of Burkholderia Ambifaria Bc-F Have Decreased Antifungal Activity - (Peer Reviewed Journal)
Zhou, H., Yao, F., Roberts, D.P., Lessie, T.G. 2003. Ahl-deficient mutants of burkholderia ambifaria bc-f have decreased antifungal activity. Current Microbiology. 47:174-179.
ARS Research Programs in Biological Control of Plant Diseases - (Review Article)
ROBERTS, D.P., LOHRKE, S.M. ARS RESEARCH PROGRAMS IN BIOLOGICAL CONTROL OF PLANT DISEASES. PEST MANAGEMENT SCIENCE. 59:654-664. 2003.
Current Research in Biological Control of Plant Diseases - (Popular Publication)
ROBERTS, D.P., LOHRKE, S.M., CHUNG, S. CURRENT RESEARCH IN BIOLOGICAL CONTROL OF PLANT DISEASES. Korean Monthly Agriculture and Horticulture. 2002.
Microbial Community Structure and the Rhizosphere Effect - (Abstract Only)
BUYER, J.S., BLACKWOOD, C.B., ROBERTS, D.P., PAUL, E.A. MICROBIAL COMMUNITY STRUCTURE AND THE RHIZOSPHERE EFFECT. AGRONOMY ABSTRACTS. 2002. S03-buyer 123344-Poster.
Mutation in An Cyaa Homologue in Enterobacter Cloacae Results in Reduced Colonization But Does Not Affect Damping-off on Cucumber - (Abstract Only) - (30-Jul-02)
Mutation in An Sdha Homologue in Enterobacter Cloacae Results in Reduced Colonization But Does Not Affect Biocontrol of Damping off on Cucumber - (Abstract Only) - (30-Jul-02)
Detection of Root-Associated Microbes That Produce Compounds Active Against Plant-Parasitic Nematodes - (Abstract Only)
Meyer, S.L., Roberts, D.P., Nitao, J.K., Chitwood, D.J. Detection of root-associated microbes that produce compounds active against plant-parasitic nematodes. 2002. Phytopathology 92(suppl): S55-S56.
Mutation in the Sdha Homologue in Enterobacter Cloacae Results in Colonization of Cucumber Roots But Does Not Affect Biocontrol of Damping-off on Cucumber Caused by Pythium Ultimum - (Abstract Only) - (18-Apr-02)
Mutation in Rpia Homologue in Enterobacter Cloacae Decreases Colonization and Biocontrol of Damping-off by Pythium Ultimum - (Peer Reviewed Journal) - (07-Apr-02)
Analysis of Mutant Derivatives of Burkholderia Ambifaria and B. Multimorans Altered with Respect to Formation of N-Acyl Homoserine Lactones - (Abstract Only) - (05-Apr-02)
Examination of Rhizosphere-Associated Microbes for Production of Compounds Active Against Plant-Parasitic Nematodes - (Abstract Only)
Meyer, S.L., Roberts, D.P., Nitao, J.K., Chitwood, D.J. 2002. Examination of rhizosphere-associated microbes for production of compounds active against plant-parasitic nematodes. 2002. Nematology 4: 288.
Biological Control for Control of Soilborne Pathogens - (Popular Publication)
Chung, S., Roberts, D.P. 2002. Biological control for control of soilborne pathogens. Korean Monthly Agriculture and Horticulture. March, 2002.
Field Evaluation of Selected Bacterial Isolates and Seed Treatment Fungicides for the Control of Take-All in Roane Soft Red Winter Wheat in Virginia, 2001 - (Peer Reviewed Journal) - (25-Feb-02)
Production of Extracellular Phenolic Antioxidants Provides a Buffer Against Low-Level Buildup of Ros in Plants - (Abstract Only) - (22-Nov-01)
Biocontrol of Seedling Pathogens and Root-Knot on Vegetables - (Abstract Only) - (05-Nov-01)
Combinations of Biocontrol Agents for Management of Plant-Parasitic Nematodes and Soilborne Plant-Pathogenic Fungi - (Peer Reviewed Journal)
Meyer, S.L., Roberts, D.P. 2002. Combinations of biocontrol agents for management of plant-parasitic nematodes and soilborne plant-pathogenic fungi. Journal of Nematology 34: 1-8.
Increased Severity of Erwina Soft Rot on Callas in the Presence of Phosphate - (Abstract Only) - (29-Aug-01)
Biocontrol of Root-Knot Nematode on Pepper - (Abstract Only) - (12-Aug-01)
Mutation in An Rpiahomologue in Enterobacter Cloacae Affects Cucumber Seed Colonization and Biocontrol of Damping off on Cucumber Caused by Pythium Ultimum - (Abstract Only) - (10-Jul-01)
Broad Spectrum Anti-Biotic Activity and Disease Suppression by the Potential Biocontrol Agen Burkholderia Ambifaria Bc-F - (Peer Reviewed Journal)
Li, W., Roberts, D.P., Dery, P.D., Meyer, S.L., Lohrke, S.M., Lumsden, R.D., Hebbar, K.P. 2002. Broad spectrum anti-biotic activity and disease suppression by the potential biocontrol agen burkholderia ambifaria BC-F. Crop Protection. 21:129-135.
Identification of a Locus in Enterobacter Cloacae Important for Seed Colonization and Biocontrol of Damping-off in Cucumber - (Abstract Only) - (25-Apr-01)
Field Evaluation of Selected Bacterial Isolates and Seed Treatment Fungicides for the Control of Take-All in Madison Soft Red Winter Wheat, 2000 - (Peer Reviewed Journal) - (20-Feb-01)
Application of Burkholderia Cepacia and Trichoderma Virens, Alone and in Combinations, Against Meloidoigyne Incognita on Bell Pepper - (Peer Reviewed Journal) - (05-Jan-01)
Application of Burkholderia Cepacia and Trichoderma Virens, Alone and in Combinations, Against Meloidogyne Incognita on Bell Pepper - (Peer Reviewed Journal) - (05-Jan-01)
Analysis of Fungal Communities by Sole Carbon Source Utilization Profiles - (Peer Reviewed Journal) - (11-Dec-00)
Total Catabolic Capabilities of Enterobacter Cloacae Are Not Required for Beneficial Activities of This Bacterium in the Spermosphere - (Abstract Only) - (31-Aug-00)
Characterizing the Oxygen Uptake Response During Plant/bacteria Recognition - (Abstract Only) - (31-Aug-00)
Effect of Decreased Catabolic Capability of Enterobacter Cloacae Strain a-11 on Root Colonization and Suppression of Damping-off of Cucumber Caused by Pyhtium Ultimum - (Proceedings) - (01-Aug-00)
Evaluation of Trichoderma Virens and Burkholderia Cepacia for Anatgonistic Activity Against Root-Knot Nematode, Meloidogyne Incognita - (Peer Reviewed Journal) - (28-Jul-00)
Effect of Decreased Catabolic Capability of Enterobacter Cloacae Strain a-11 on Root Colonization and Suppression of Damping-off Caused by Pythium Ultimum on Cucumber - (Abstract Only) - (01-Jul-00)
Lysis of Plant Pathogenic Fungi and Biocontrol - (Popular Publication) - (22-Feb-00)
Wheat (Triticum Aestivum Cv Madison) Take-All, Gueumannomyces Graminis Var Tritici - (Peer Reviewed Journal) - (14-Feb-00)
Association of the Plant-Beneficial Fungus Verticillium Lecanii with Soybean Roots and Rhizosphere - (Peer Reviewed Journal) - (28-Nov-99)
Role of the Pfka Gene of Enterobacter Cloacae in Colonization of Radish, Soybean, Sunflower and Sweet Corn Seeds - (Peer Reviewed Journal) - (19-Oct-99)
Seedling Diseases - (Popular Publication) - (27-Sep-99)
Nematode-Antagonistic Activity of Gliocladium Virens and Burkholderia Cepacia - (Abstract Only) - (06-Jul-99)
Effect of N Source on Root Exudates and Yield of Eggplants Grown in Verticillium Infested Soil - (Abstract Only) - (06-Jul-99)
Biological Disease Control: Considerations for Seed Treatments and Stand Establishmnent - (Proceedings) - (06-May-99)
Characteristics of the Cucumber Seed Colonization Mutant Enterobacter Cloacae A-11 - (Peer Reviewed Journal) - (19-Mar-99)
The Total Catabolic Capabilities of Enterobacter Cloacae Are Not Required for Suppression of Damping-off of Cucumber Caused by Pythium Ultimum - (Abstract Only) - (10-Mar-99)
Biological Disease Control: Considerations for Seed Treatment and Stand Establishment - (Abstract Only) - (10-Feb-99)
Field Evaluation of Selected Bacterial Isolates and Seed Treatment Fungicides for the Control of Take-All in Jackson Soft Red Winter Wheat, 1998 - (Peer Reviewed Journal) - (14-Jan-99)
Isolation of a Mutant of Enterobacter Cloacae Reduced in Colonization and in Biocontrol - (Abstract Only) - (10-Nov-98)
Usda, Ars, Beltsville Area Programs Directed at Development of Methyl Bromide Alternatives for Pre-Plant Applications - (Abstract Only) - (07-Nov-98)
Usda, Ars, Beltsville Area Programs Directed at Development of Methyl Bromide Alternatives for Pre-Plant Applications - (Abstract Only) - (07-Nov-98)
Use of Colonization-Impaired Strain of Enterobacter Cloacae in Biocontrol of Pythium Ultimum Damping-off of Cucumber and in Seed Treatments Containing Combinations of Biocontrol Agents. - (Abstract Only) - (07-Sep-98)
Spatial Analysis of Enterobacter Cloacae in Cucumber Rhizosphere Using Digital Image Processing - (Peer Reviewed Journal) - (12-Aug-98)
Spatial and Temporal Interactions of Verticillium Lecanii with Heterodera Glycines and with Soybean Roots - (Abstract Only) - (23-Jun-98)
Biological Control of Fungal Diseases - (Book / Chapter) - (17-Mar-98)
Genetic Analysis of the Seed Colonization Mutant Enterobacter Cloacae A-11 - (Proceedings) - (01-Sep-97)
Population Dymanics of the Carbohydrate-Utilization-Mutant Nterobacter Cloacae a-11 and Seed Exudation - (Abstract Only) - (30-Aug-97)
Rhizosphere Activity of the Nematode-Antagonistic Fungus Verticillium Lecanii - (Abstract Only) - (19-Jul-97)
Effect of Sclerotial Damage of Sclerotinia Sclerotiorum on the Mycoparasitic Activity of Trichoderma Hamatum - (Peer Reviewed Journal) - (12-May-97)
Biological Control of Damping-off of Cucumber Caused by Pythium Ultimum with a Root-Colonization-Deficient Strain of Enterobacter Cloacae - (Peer Reviewed Journal) - (05-May-97)
Use of a Colonization-Deficient Strain of Enterobacter Cloacae in Strain Combinations for Enhanced Biocontrol of Cucumber Seedling Diseases - (Peer Reviewed Journal) - (05-May-97)
Behavior of Biocontrol Bacteria in the Spermosphere and Rhizosphere - (Book / Chapter) - (12-Nov-96)
Population Dynamics of the Biocontrol Agent Enterobacter Cloacae 501r3 and the Carbohydrate-Utilization Mutant a-11 in Various Spermospheres - (Abstract Only) - (07-Jul-96)
In Vitro Analysis of the Role of Glucose Oxidase from Talaromyces Flavus Inbiocontrol of the Plant Pathogen Verticillium Dahliae - (Peer Reviewed Journal) - (20-Jun-96)
Genetic Approaches for Analysis and Manipulation of Rhizosphere Colonization by Bacterial Biocontrol Agents - (Book / Chapter) - (24-Apr-96)
Peptide Utilization and Proliferation in Corn, Radish, and Wheat Spermosphere by Enterobacter Cloacae - (Peer Reviewed Journal) - (06-Mar-96)
Potential Uses for Genetically-Modified, Colonization-Deficient Plant-Beneficial Bacteria in Biological Control of Soilborne Plant Pathogens - (Other) - (01-Sep-95)
Last Modified: 12/16/2010
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