Samuel J. Martins, Ph.D.

  • Research Technologist
  • Bull Lab
Samuel J. Martins, Ph.D.
113 Buckhout (Office)
111 Buckhout (Lab)
105 Buckhout (Lab)

University Park, PA 16802
Work Phone: 814-863-5740
Fax: 814-863-7217

Areas of Expertise

  • Plant Bacteriology
  • Biocontrol of Plant Disease
  • Translational Taxonomy

Connect with Samuel J. Martins, Ph.D.



  1. Ph.D. Plant Pathology, Federal University of Lavras, Brazil, 2016
  2. Ph.D. Exchange period, University of Delaware, 2013-2014
  3. M.S. Plant Pathology, Federal University of Lavras, Brazil, 2012
  4. B.S. Agronomy, Federal University of Lavras, Brazil, 2010

Employment History

  • Postdoctoral Scientist, The Pennsylvania State University, 2017-present
  • Professor of Plant Pathology, Federal University of Goias, Brazil, 2015-2017

Awards and Fellowships

  • 2017 Best doctoral thesis defended of Depart. of Plant Pathology, Federal Univ. of Lavras, Brazil and indicated for the national award (CAPES)
  • 2014-2015 Exchange Ph.D. Program Fellow, University of Delaware, USA
  • 2012 Doctoral Fellow, Federal University of Lavras, Brazil
  • 2012 Alltech’s Young Scientist Award for Graduate Competition, Alltech Lexington, KY, USA
  • 2010 Masters Fellow, Federal University of Lavras, Brazil
  • 2006-2010 Bachelor of Science Fellow, Federal University of Lavras, Brazil 

Research Interests

My research interests focus on phytobacteriology and biological control of plant diseases by the use of beneficial bacteria. Currently, I am working on distinguishing among closely-related bacterial plant pathogens by using multilocus sequence anaylsis (MLSA) and also on predation of plant and other bacterial pathogens by myxobacteria.  



Peer-Reviewed Manuscripts

  1. Martins SJ, Rocha GA, Georg RC, Ulhôa CJ, Cunha MG, Rocha MR, Araújo LG, Vaz KS, Dianese EC, Oshiquiri LH, Dunlap CA. Plant-associated bacteria mitigate drought stress in soybean. Environmental Science and Pollution Research, 2018. 
  2. Martins SA, Schurt, DA, Seabra SS, Martins SJ, Ramalho MAP, Moreira FMS, da Silva JCP. da Silva JAG, Medeiros FHV. Common bean (Phaseolus vulgaris L.) growth promotion and biocontrol by rhizobacteria under Rhizoctonia solani suppressive and conducive soils. Applied Soil Ecology, v. 127, p.129-135, 2018. apsoil.2018.03.007
  3. Martins SJ, Medeiros FHV, Lakshmanan V, Bais HP. Impact of seed exudates on growth and biofilm formation of Bacillus amyloliquefaciens ALB629 in common bean. Frontiers in Microbiology, v. 8, p. 1-9, 2018.
  4. Terra WC, Campos VP, Martins SJ, Costa LSAS, da Silva JCP, Barros AF, Lopez LE, Santos TCN, Smant G. Volatile organic molecules from Fusarium oxysporum strain 21 with nematicidal activity against Meloidogyne incognita. Crop Protection, v. 106, p. 125-131, 2018.
  5. Martins SJ, Medeiros FHV, Andrade RC, Nunez AMP, Souza B, Moino Junior A, Filgueiras CC. Dual role of milk on aphid and powdery mildew control in kale. Scientia Horticulturae, v. 203, 126-130, 2016.
  6. Martins SJ, Medeiros FHV, Souza RM, Faria AF, Cancellier EL, Silveira HRO, Rezende MLV, Guilherme LRG. Common bean growth and health promoted by rhizobacteria and the contribution of magnesium to the observed responses. Applied Soil Ecology, v. 87, p. 49-55, 2015.
  7. Martins SJ, Soares AC, Medeiros FHV, Santos DBC, Pozza EA. Contribution of host and environmental factors to the hyperparasitism of coffee rust under field conditions. Australasian Plant Pathology, v. 44, p. 605-610, 2015. doi.10.1007/s13313-015-0375-2
  8. Martins SJ, Medeiros FHV, Souza RM, Vilela LAF. Is curtobacterium wilt biocontrol temperature dependent? Acta Scientiarum. Agronomy (Online), v. 36, p. 409, 2014.
  9. Silva EO, Martins SJ, Alves E. Essential oils for the control of bacterial speck in tomato crop. African Journal of Agricultural Research, v. 9, p. 2624-2629, 2014. doi:10.5897/ajar2014.8918      
  10. Martins SJ, Medeiros FHV, Souza RM, Rezende MLV, Ribeiro Junior PM. Biological control of bacterial wilt of common bean by plant growth-promoting rhizobacteria. Biological Control (Print), v.66, p. 65-71, 2013.
  11. Medeiros FHV, Martins SJ, Zucchi TD, Melo IS, Batista LR, Machado JC. Biological control of mycotoxins-producing molds. Ciência e Agrotecnologia, v.36, p. 483-497, 2012. 
 Under Review
  1. Martins SJ, Medeiros FHV, Pedroso MP, Cunha MG, Rocha MR, Faria AF. Rhizobacterial volatiles in the control of anthracnose in common bean. Biological Control
  2. Laborde MCF, Botelho D, Rodríguez G, Resende MLV, Queiroz M, Batista A, Cardoso P, Pascholati S, Gusmão L, Martins SJ, Medeiros FHV. Phialomyces macrosporus reduces Cercospora coffeicola survival on symptomatic coffee leaves. Coffee Science.
  3. Oliveira DF, Costa VA, Terra WC, Campos VP, Paula PM, Martins SJ. Hydroquinone controls Meloidogyne incognita in tomato plants. Experimental Parasitology

Academic Presentation 

  1. Martins SJ. The use of beneficial microbes on crop production. Pennsylvania State University, University Park,  2018. (Invited talk)
  2. Martins SJ. The beneficial microbes: the justice league of the plant universe. SACNAS, Salt Lake City, Utah, 2017. (Invited talk)
  3. Martins SJ. Protection against biotic and abiotic stresses in legumes by rhizobacteria and abiotic stresses in legumes. Virginia Tech, Virginia Beach Campus, 2017. (Invited talk)
  4. Martins SJ, Fautt C, Ramos-Sepulveda L, Hockett KL, Bull CT. Foundational research to optimize the isolation of biocontrol agents for the control of mushroom blotch caused by Pseudomonas spp. Mushroom Short Course, Pennsylvania State University, University Park,  2018.
  5. Martins SJ, Medeiros FHV, Lakshmanan V, Bais HP. A benign Bacillus amyloliquefaciens ALB629 promotes drought tolerance in common bean (Phaseolus vulgaris). University of Delaware’s Microbial Systems Symposium, Newark, DE, 2015. 
  6. Martins SJ, Medeiros FHV, Faria AF, Pedroso MP. Rhizobacterial volatiles in the control of anthracnose in common bean. Mid-Atlantic Section Spring Meeting, University of Delaware, Newark, DE, 2014.
  7. Martins SJ, Medeiros FHV, Souza RM, Rezende MLV, Ribeiro Junior PM. Plant-growth promoting rhizobacteria attenuates Curtobacterium flaccumfaciens pv. flaccumfaciens defense suppression-like in common bean. APS Annual Meeting, Austin, Texas. 2013.
  8. Martins SJ, Medeiros FHV, Souza RM. Effect of temperature on Curtobacterium flaccumfaciens pv. flaccumfaciens in vitro inhibition by Bacillus subtilis ALB629. 45th Brazilian Congress of Plant Pathology, Amazonia, Brazil, 2012.

Teaching Experience

  • Fall 2018 - Instructor PPEM 300: Horticulture Crop Diseases, Pennsylvania State University, USA
  • 2018 - Obtained the Graduate Online Teaching Certificate, Pennsylvania State University, USA
  • 2015-2017 - Assistant Professor ESA0156: General Plant Pathology and ESA0434: Integrated Disease Management, Federal University of Goias, Brazil
  • 2011-2012 - Instructor BIO1: Plant Biology (Pre-Uni), Federal University of Lavras, Brazil