Samuel J. Martins, Ph.D.

  • Postdoctoral Researcher | Lab Manager
  • 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. B.S. Agronomy, Federal University of Lavras, Brazil, 2010

Research Interests

My research interests focus on manipulating and extracting bacteria from the phytobiome to manage plant disease, improve nutrient uptake and diminish the impact of abiotic stress, such as drought, by increasing the water use efficiency. Currently, I am working with translational taxonomy of plant pathogenic bacteria, by the use of multilocus sequence analysis (MLSA), to distinguish among closely related bacterial plant pathogens as well as examine the whole genome of pathogenic Pseudomonas spp. for virulence factors responsible for causing blotch symptoms on mushrooms (Agaricus bisporus). 

Employment History

  • Postdoctoral Researcher | Lab Manager, The Pennsylvania State University, 2017-present
  • Assistant Professor of Plant Pathology, Federal University of Goias, Brazil, 2015-2017


Awards and Fellowships

  • 2019 Phytobiomes poster award at the APS Plant Health meeting held in Cleveland, OH. Award donor: Noble Research Institute
  • 2019 Art in Phytopathology chosen as the "Humor" category winner: "Lemonphage as a biocontrol of Watermelonmonas sp." APS Annual Meeting, Cleveland, Ohio, USA 
  • 2018 Laurence D. and Mary Ann Moore Faculty and Staff Award in Plant Pathology (Outstanding Postdoc), Depart. of Plant Pathology and Environ. Microbiology, Pennsylvania State University, USA
  • 2017 Best doctoral thesis defended in the 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 Alltech’s Young Scientist Award for Graduate Competition, Alltech Lexington, KY, USA 

Teaching Experience

  • Fall 2018 - Instructor PPEM 300: Horticulture Crop Diseases, Pennsylvania State University, USA
  • 2018 - Graduate Online Teaching Certificate, Penn State University, USA
  • 2015-2017 - Assistant Professor ESA0156: General Plant Pathology and ESA0434: Integrated Disease Management, Federal University of Goias, Brazil
  • Fall 2013 - Teaching Assistant BIO1: Biological Control of Plant Diseases, Federal University of Lavras, Brazil
  • 2011-2012 - Instructor BIO1: Plant Biology (Pre-Uni), Federal University of Lavras, Brazil


Peer-Reviewed Manuscripts

  1. Martins SJ, Trexler RV, Vieira FR, Pecchia J, Kandel P, Hockett K, Bell TH, Bull CT. Comparing approaches for capturing bacterial assemblages associated with symptomatic (bacterial blotch) and asymptomatic mushroom (Agaricus bisporus) caps. Phytobiomes, 4:90-99, 2020. 
  2. Fráguas RM, Costa VA, Terra WC, Aguiar AP, Martins SJ, Campos VP, Oliveira DF. Toxicities of 4,5-Dihydroisoxazoles against the Root-Knot Nematodes and in Silico Studies of their Mode of Actions. Journal of Agricultural and Food Chemistry, 68:523-529, 2020.
  3. Hamidizade M, Taghavi MS, Martins SJ, Herschlag RA, Hockett KL, Bull CT, Osdaghi E. Bacterial brown pit, a new disease of edible mushroom caused by Mycetocola sp. Plant Disease, 2019.
  4. Osdaghi E, Martins SJ, Sepulveda L, Vieira FR, Pecchia JA, Beyer DM, Bell TH, Yang Y, Hockett KL, Bull CT. 100 Years since Tolaas: Bacterial Blotch of Mushrooms in the 21st Century. Plant Disease, 2019.
  5. Martins SJ, Medeiros FHV, Pedroso MP, Cunha MG, Rocha MR, Faria AF. Rhizobacterial volatiles in the control of anthracnose in common bean. Biological Control, 131:36-42, 2019. 
  6. Oliveira DF, Costa VA, Terra WC, Campos VP, Paula PM, Martins SJ. Impact of phenolic compounds on Meloidogyne incognita in vitro and in tomato plants. Experimental Parasitology, 2019.
  7. 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, 14:1-11, 2019.
  8. 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. 
  9. 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, 127:129-135, 2018. apsoil.2018.03.007
  10. 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, 8:1-9, 2018.
  11. 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, 106:125-131, 2018. Cited by 17  
  12. 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, 203:126-130, 2016.
  13. 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, 87:49-55, 2015. Cited by 10  
  14. 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, 44:605-610, 2015. doi.10.1007/s13313-015-0375-2
  15. Martins SJ, Medeiros FHV, Souza RM, Vilela LAF. Is curtobacterium wilt biocontrol temperature dependent? Acta Scientiarum. Agronomy (Online), 36:409-415, 2014.
  16. Silva EO, Martins SJ, Alves E. Essential oils for the control of bacterial speck in tomato crop. African Journal of Agricultural Research, 9:2624-2629, 2014. doi:10.5897/ajar2014.8918 Cited by 12  
  17. 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), 66:65-71, 2013. Cited by 39 
  18. Medeiros FHV, Martins SJ, Zucchi TD, Melo IS, Batista LR, Machado JC. Biological control of mycotoxins-producing molds. Ciência e Agrotecnologia, 36:483-497, 2012. Cited by 35  
Academic Presentation 
  1. Martins SJ-Vieira (Co-presenters) et al. Mycobiome management of Agaricus bisporus targeting green mold (Trichoderma spp.) and blotch (Pseudomonas spp.). NED-APS, University Park, 2019. (Invited talk)
  2. Martins SJ. Know your enemy before you go to war: a story of bacterial blotch of mushroom. PSU Microbiome Center, University Park, 2019. (Invited talk)
  3. Martins SJ. Looking for a microbial needle in a mushroom haystack: how can microbiome analysis be used to control blotch disease in mushroom, Office of Postdoctoral Affairs, Webster's Café- State College, 2019. (Invited talk)
  4. Martins SJ. The use of beneficial microbes on crop production. Pennsylvania State University, University Park,  2018. (Invited talk)
  5. Martins SJ. The beneficial microbes: the justice league of the plant universe. SACNAS, Salt Lake City, Utah, 2017. (Invited talk)
  6. 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)
  7. 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 CoursePennsylvania State University, University Park,  2018.
  8. 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. 
  9. 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.
  10. 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.
  11. 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.