S. Patricia Stock

Interim Director and Professor (Joint Appointment with Department of Entomology)

Interim Director at School of Animal and Comparative Biomedical Sciences
University of Arizona
Saguaro Hall, Room 129
1110 E South Campus
Tucson, AZ 85721

Dept. Entomology
University of Arizona
Forbes Bldg. Room 410.
1140 E. South Campus Dr.
Tucson, AZ 85721-0036

1992: Ph.D. Natural Sciences (Parasitology), National University of La Plata, Argentina.
1985: BS, Zoology, University of La Plata, Argentina.

Visit Patricia Stock's website

Research Interests: Insect pathogens as model systems. Nematode-bacteria symbioses. Multitrophic interactions. Entomopathogens and pest management.

My research program focuses on the study of insect pathogens as model systems. We study entomopathogenic nematodes (aka EPN) Steinernema and Heterorhabditis spp. (Nematoda:SteinernematidaeHeterorhabditidae) and their bacterial symbiont bacteria Xenorhabdus and Photorhabdus spp (Enterobacteriaceae) which represent an emerging model of terrestrial animal-microbe symbiotic relationships. Questions regarding the mutualism between Steinernema and Xenorhabdus surround many issues: How this association is maintained and transmitted through generations? What beneficial functions each partner provides to the other? How partner specificity is maintained? How symbionts contribute to nematode communication with each other and insect host finding? EPN symbiotic bacteria also represent a new and rich source of novel bioactive molecules with insecticidal, nematicidal, antibiotic, and antimycotic properties. In this respect, my laboratory is involved in the discovery and characterization secondary metabolites of a newly discovered Photorhabdus bacterium that is native to SW USA. We also investigate eukaryote-prokaryote mutualisms as models for understanding trophic complexities and interactions in food webs.

A continued research focus is nematode biodiversity. My laboratory is actively engaged in survey and inventory projects in different geographic regions of the world. Our involvement in these biotic surveys and inventory projects provide us with the opportunity to discover and describe new taxa, but to also consider novel nematode taxa in applied research including their implementation in biological control or integrated pest management of insect pests. In this respect, our program also focuses on insect pathology and the use of EPN as biological control agents. The overarching goal of this research is to not only expand our knowledge of ecology and behavior of these entomopathogens but also to develop them as effective biological control agents against major agricultural and urban pests.

Teaching Responsibilities:

Every fall semester:
   ACBS/ENTO/ECOL/MIC310 - Living in Symbiosis
   HNRS 195I- Honors Freshmen Colloquium (topic varies each year)
Every other spring semester: 
   ENTO 446/EIS 546 - Insect Pathogens

Selected Publications (last 5 years):

Murfin, K.E., Klassen, J. L., McDonald, B. R., Lee, M. M., Large, B., Forst, S.,Stock, S.P.,. Currie, C. R. and Goodrich-Blair, H. 2014. Bacterial strain diversity in beneficial symbioses contributes to coevolution and symbiotic maintenance (in preparation)

BischG, Pagès, S. McMullen II J.G.,Stock, S.P.,Duvic,B., Givaudan, A. Gaudriault, S. 2015. Xenorhabdus bovienii CS03, the bacterial symbiont of the entomopathogenic. J. Invert. Pathol. 124: 15-22.

McMullen, J. G., Lee, M. M. and Stock, S. P. 2014. In vivo and in vitro rearing of entomopathogenic nematodes (Steinernematidae and Heterorhabditidae). J. Visual Experiments 91, e52096, doi:10.3791/52096.

Cimen, H., Lee, M. M., Hatting, J., Hazir, S. and Stock, S. P. 2014. Steinernema tophus n. sp. (Nematoda: Steinernematidae), a new entomopathogenic nematode from South Africa. Zootaxa 3821:337-353.

Orozco, R., Lee, M. M. and Stock, S. P. 2014. Soil Sampling and Isolation of Entomopathogenic Nematodes (Steinernematidae, Heterorhabditidae). J. Visual Experiments, 89:1-8; doi: 10.3791/52083.

Navarro, P.D., McMullen, J. G. and Stock, S. P. 2014. Interactions of two Arizona-Native Entomopathogenic Nematodes with Chemical and Biological Insecticides. Nematropica

Cimen, H., Lee, M. M., Hatting, J., Hazir, S. and Stock, S. P. 2014. Steinernema innovationi n. sp. (Panagrolaimomorpha: Steinernematidae), a new entomopathogenic nematode species from South Africa. Journal of Helminthology, 3:1-4.

Castagnola, A. and Stock, S. P. 2014. Common virulence factors and tissue targets of entomopathogenic bacteria for biological control of lepidopteran pestsInsects, 5, 139-166.

Miranda, V. A., Davidowitz, G., Bronstein, J. and Stock, S. P. 2014. The effect of insect host age and diet on the fitness of the entomopathogenic nematode- bacteria complex. Symbiosis, 61, 145-153

Navarro, P.D., McMullen, J. G. and Stock, S. P. 2013. Interactions between the entomopathogenic nematodeHeterorhabditis sonorensis (Nematoda: Heterorhabditidae) and the saprobic fungus Fusarium oxysporum. Journal of Invertebrate Pathology, 115, 41-47.

Orozco, R. A., Hill, T. and Stock, S. P. 2013. Characterization and phylogenetic relationships of Photorhabdus luminescens subsp. sonorensis (Gamma-Proteobacteria: Enterobacteriaceae) the bacterial symbiont of the entomopathogenic nematode Heterorhabditis sonorensis (Nematoda: Heterorhabditidae).Current Microbiology: 66, 30-39.

Orozco, R. A., Hill, T. and Stock, S. P. 2012. Characterization and phylogenetic relationships of Photorhabdus luminescens subsp. sonorensis (Proteobacteria: Enterobacteriaceae) the bacterial symbiont of the entomopathogenic nematode Heterorhabditis sonorensis (Nematoda: Heterorhabditidae)Current Microbiology (In Press)

Miranda, V. A., Davidowitz, G., Bronstein, J. and Stock, S. P. 2012. The effect of insect host age and diet on the fitness of the entomopathogenic nematode- bacteria complex. J. Invert. Pathol. (In Press).

Dillman, A., Chaston, J. M. Adams, B. J. Ciche, T. A. Goodrich-Blair, H., Stock. S. P. And Sternberg, P. 2012. An entomopathogenic nematode by any other namePLOS Pathogen. 8

Gassmann, A. J., E. Hannon, Sisterson, M. Carriere, Y, Tabashnik, B. E. and Stock, S. P. 2012. Effects of entomopathogenic nematodes on evolution of pink bollworm resistance to Bacillus thuringiensis Toxin Cry1Ac. J.Econom. Entomol. 105: 994-1005.

Kim, S. K. Flores-Lara, Y and Stock, S. P. 2012. Morphology and ultrastructure of the bacterial receptacle inSteinernema nematodes (Nematoda: Steinernematidae). J. Invert. Pathol. 110: 366-374.

Stock, S. P. Lee, M. M. and Flores-Lara, Y. 2012. The rectal glands of Heterorhabditis bacteriophora (Rhabditida: Heterorhabditidae) hermaphrodites and their role in symbiont transmission. J. Invert. Pathol. 101: 135-138.

Kaminga,K.L. Davis, J. A., Stock, S P. and Richter, A. R. 2011. First Report of a Mermithid Nematode InfectingPiezodorus guildinii and Acrosternum hilare (Hemiptera: Pentatomidae) in the United States. The Florida Entomologist. 94: 890-894.

Stock, S. P., Bird, D., Ghedin, E. and Goodrich-Blair, Heidi. 2011. Abstracts of NEMASYM: The Third Nematode-Bacteria Symbioses Research Coordination Network MeetingSymbiosis. 55: 1-13

Sugar, D. R. , Murfin, K. E., Chaston, J. M., Andersen, A. W., Richards, G. R., deLéon, L., Baum, J. A., Clinton, W. P. , Forst, S., Goldman, B. S. , Krasomil-Osterfeld, K. C., Slater, S., Stock, S. P. and Goodrich-Blair, H. 2011.Phenotypic variation and host interactions of Xenorhabdus bovienii SS 2004, the entomopathogenic symbiont of Steinernema jollieti nematodes. Env. Microbiol.DOI: 10.1111/j.1462-2920.2011.02663.x.

Lee, M. M. and Stock, S. P. 2010. A multigene approach for assessing evolutionary relationships of Xenorhabdus spp. (Proteobacteria), the bacterial symbionts of entomopathogenic Steinernema nematodes. Journal of Invertebrate Pathology 104, 67-74.

Lee, M. M. and Stock, S. P. 2010. . Systematic Parasitology 77, 1-12.

Stock, S. P., Selossé, M.A., Bordenstein, S., Odden, J., Oldenberg, D., Reznikoff, W. and Werren, J. H. 2010. Symbiosis instruction: considerations from the education workshop at the 6th ISS Congress. Symbiosis 51, 67-73.

Gassmann, A. J. Stock, S. P., Tabashnik, B. E. and Singer, M. J. 2010. Tritrophic effects of host plants on an herbivore-pathogen interaction. Annals of the Entomological Society of America 103, 371-378.

Hannon, E. R., Sisterson, M. S., Stock, S. P., Carrière, Y., Tabashnik, B. E. and Gassmann, A. J. 2010. Effects of four nematode species on fitness costs of pink bollworm resistance to Bacillus thuringiensis toxin Cry1AcJournal of Economic Entomology 103, 1821-1831.

Plichta, K. C., Joyce, S., Waterfield, N., Clarke, D. and Stock S. P. 2009. Heterorhabditis gerrardi n. sp. (Nematoda: Heterorhabditidae): the hidden host of Photorhabdus asymbiotica (Enterobacteriaceae: Gamma-Proteobacteria.Journal of Helminthology 83, 309-320.

Hatting, J., Stock, S. P. and Hazir, S. 2009. Diversity and distribution of entomopathogenic nematodes (Steinernematidae, Heterorhabditidae) in South AfricaJournal of Invertebrate Pathology 102,120-128.

Powers, T.O., Neher, D.A., Mullin, P. Esquivel, A., Giblin-Davis, R.M., Kanzaki, N., Stock, S. P., Mora, M. M. and Uribe-Lorio, L. 2009. Tropical nematode diversity: vertical stratification of nematode communities in a Costa Rican humid lowland rainforest. Molecular Ecology 18, 985-996.

Stock, S. P., Rivera-Orduño, B. and Flores-Lara, Y. 2009. Heterorhabditis sonorensis n. sp. (Nematoda: Heterorhabditidae), a natural pathogen of the seasonal cicada Diceroprocta ornea (Homoptera: Cicadidae in the Sonoran desert. Journal of Invertebrate Pathology 100, 175-184.

Gassmann A. J., Fabrick, J.A., Sisterson, M. Hannon, E.R., Stock, S. P., Carrière, Y and Tabashnik, B.E. 2009. Effects of pink bollworm resistance to Bacillus thuringiensis on phenoloxidase activity and susceptibility to entomopathogenic nematodesJournal of Economic Entomology 102, 1224-1232.

Lee, M. M., Sicard, M., Skeie, M, and Stock, S. P. 2009. Steinernema boemarei n. sp. (Nematoda: Steinernematidae), a new entomopathogenic nematode from southern FranceSystematic Parasitology 72, 127-141.

Xu, Y., Orozco, R., Kithsiri, E.M., Espinosa-Artiles, P. Gunatilaka L., Stock, S. P., and Molnár, I. 2009. Biosynthesis of the cyclooligomer depsipeptide bassianolide, an insecticidal virulence factor of Beauveria bassianaFungal Genetics and Biology 46, 353-364.

Courses Taught: 
ACBS/ENTO/ECOL/MIC310 - Living in Symbiosis