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ARS Home » Southeast Area » Gainesville, Florida » Center for Medical, Agricultural and Veterinary Entomology » Chemistry Research » People & Locations » Shawn Christensen

Shawn Christensen
Chemistry Research
Research Plant Physiologist

Phone: (352) 374-5739
Fax: (352) 374-5707

1700 S.W. 23RD DR
GAINESVILLE , FL 32608
Projects
Molecular and Biochemical Characterization of Biotic and Abiotic Stress on Plant Defense Responses in Maize
In-House Appropriated (D)
  Accession Number: 434496

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Production and function of terpenoid defense compounds in maize (Zea mays) -
Block, A.K., Vaughan, M.M., Schmelz, E.A., Christensen, S.A. 2018. Production and function of terpenoid defense compounds in maize (Zea mays). Planta. doi:10.1007/s00425-018-2999-2.
Interactions among plants, insects, and microbes: elucidation of inter-organismal chemical communications in agricultural ecology -
Beck, J.J., Alborn, H.T., Block, A.K., Christensen, S.A., Hunter III, C.T., Rering, C.C., Seidl-Adams, I., Stuhl, C.J., Torto, B., Tumlinson, J.H. 2018. Interactions among plants, insects, and microbes: elucidation of inter-organismal chemical communications in agricultural ecology. Journal of Agricultural and Food Chemistry. 66(26):6663-6674. doi:10.1021/acs.jafc.8b01763.
Pesticides on the inside: Exploiting the natural chemical defenses of maize against insect and microbial pests -
Christensen, S.A., Hunter Iii, C.T., Block, A.K. 2018. Pesticides on the inside: Exploiting the natural chemical defenses of maize against insect and microbial pests. ACS Symposium Series. doi:10.1021/bk-2018-1294.ch006.
Contrasting insect attraction and herbivore-induced plant volatile production in maize -
Block, A.K., Hunter III, C.T., Rering, C.C., Christensen, S.A., Meagher Jr, R.L. 2018. Contrasting insect attraction and herbivore-induced plant volatile production in maize. Planta. doi:10.1007/s00425-018-2886-x.
Commercial hybrids and mutant genotypes reveal complex protective roles for inducible terpenoid defenses -
Christensen, S.A., Sims, J., Vaughan, M.M., Hunter III, C.T., Block, A.K., Willett, D.S., Alborn, H.T., Huffaker, A., Schmelz, E.A. 2018. Commercial hybrids and mutant genotypes reveal complex protective roles for inducible terpenoid defenses. Journal of Experimental Botany. doi:10.1093/jxb/erx495.
Maize w3 disrupts homogentisate solanesyl transferase (ZmHst) and reveals a plastoquinone-9 independent path for phytoene desaturation and tocopherol accumulation in kernels -
Hunter III, C.T., Saunders, J., Magallanes-Lundback, M., Christensen, S.A., Willett, D.S., Stinard, P.S., Li, Q., Lee, K., Dellapenna, D., Koch, K.E. 2018. Maize w3 disrupts homogentisate solanesyl transferase (ZmHst) and reveals a plastoquinone-9 independent path for phytoene desaturation and tocopherol accumulation in kernels. Plant Journal. doi:10.1111/tpj.13821.
Herbivore derived fatty acid-amides elicit reactive oxygen species burst in plants -
Block, A.K., Christensen, S.A., Hunter III, C.T., Alborn, H.T. 2017. Herbivore derived fatty acid-amides elicit reactive oxygen species burst in plants. Journal of Experimental Botany. doi:10.1093/jxb/erx449.
Fungal and herbivore elicitation of a newly identified maize sesquiterpenoid, zealexin A4, is constrained by abiotic stress -
Christensen, S.A., Huffaker, A., Sims, J., Hunter III, C.T., Block, A.K., Vaughan, M.M., Willett, D.S., Mylroie, E., Williams, P.C., Schmelz, E.A. 2017. Fungal and herbivore elicitation of a newly identified maize sesquiterpenoid, zealexin A4, is constrained by abiotic stress. Planta. doi:10.1007/s00425-017-2830-5.
RNA-Seq analysis of resistant and susceptible sub-tropical maize lines reveals a role for kauralexins in resistance to grey leaf spot disease, caused by Cercospora zeina -
Meyer, J., Berger, D.K., Christensen, S.A., Murray, S.L. 2017. RNA-Seq analysis of resistant and susceptible sub-tropical maize lines reveals a role for kauralexins in resistance to grey leaf spot disease, caused by Cercospora zeina. Biomed Central (BMC) Plant Biology. 17(1):197.
Rapid defense responses in maize leaves induced by Spodoptera exigua caterpillar feeding -
Tzin, V., Hojo, Y., Strickler, S.R., Bartsch, L.J., Archer, C.M., Ahern, K.R., Shaoqun, Z., Christensen, S.A., Galis, I., Mueller, L.A., Jander, G. 2017. Rapid defense responses in maize leaves induced by Spodoptera exigua caterpillar feeding. Journal of Experimental Botany. 68(16):4709-4723.
The effects of climate change associated abiotic stresses on maize phytochemical defenses -
Vaughan, M.M., Block, A., Christensen, S., Allen, L.H., Schmelz, E.A. 2017. The effects of climate change associated abiotic stresses on maize phytochemical defenses. Phytochemistry Reviews. doi: 10.1007/s11101-017-9508-2.
Elevated carbon dioxide reduces emission of herbivore induced volatiles in Zea mays -
Block, A.K., Vaughan, M.M., Christensen, S.A., Alborn, H.T., Tumlinson, J.H. 2017. Elevated carbon dioxide reduces emission of herbivore induced volatiles in Zea mays. Plant Cell and Environment. doi:10.1111/pce.12976.
Seteria viridis as a model for pathogen resistance in the Poaceae -
Reduced stomatal conductance in plants grown under elevated carbon dioxide leads to lower emission of herbivore induced volatiles. -
Systems genetics reveals a transcriptional network associated with susceptibility in the maize-grey leaf spot pathosystem -
Christie, N., Myburg, A.A., Joubert, F., Murray, S.L., Carstens, M., Lin, Y., Meyer, J., Crampton, B.G., Christensen, S.A., Ntuli, J.F., Wighard, S.S., Van De Peer, Y., Berger, D.K. 2017. Systems genetics reveals a transcriptional network associated with susceptibility in the maize-grey leaf spot pathosystem. Plant Journal. 89(4):746–763. doi:10.1111/tpj.13419.
Interactive effects of elevated [CO2] and drought on the maize phytochemical defense response against mycotoxigenic Fusarium verticillioides Reprint Icon -
Vaughan, M.M., Huffaker, A., Schmelz, E.A., Dafoe, N.J., Christensen, S.A., McAuslane, H.J., Alborn, H.T., Allen, L.H., Teal, P.E.A. 2016. Interactive effects of elevated [CO2] and drought on the maize phytochemical defense response against mycotoxigenic Fusarium verticillioides. PLoS One. 11(7):e0159270. doi: 10.1371/journal.pone.0159270.
Maize terpenoid phytoalexins function in resistance against both abiotic and biotic stress -
Vaughan, M.M., Christensen, S.A., Schmelz, E.A., Huffaker, A., McAuslane, H., Alborn, H.T., Allen, L.H., Teal, P.E. 2016. Maize terpenoid phytoalexins function in resistance against both abiotic and biotic stress [abstract].
Maize death acids, 9-lipoxygenase derived cyclopente(a)nones, display activity as cytotoxic phytoalexins and transcriptional mediators -
Maize pathogens suppress inducible phytoalexin production to thwart innate plant immunity -
Maize white seedling 3 results from disruption of homogentisate solanesyl transferase -
A maize death acid, 10-oxo-11-phytoenoic acid, is the predominant cyclopentenone signal present during multiple stress and developmental conditions -
Christensen, S.A., Huffaker, A., Hunter III, C.T., Alborn, H.T., Schmelz, E. 2016. A maize death acid, 10-oxo-11-phytoenoic acid, is the predominant cyclopentenone signal present during multiple stress and developmental conditions. Plant Signaling and Behavior. 11(2):e1120395.
Genetic mapping shows intraspecific variation and transgressive segregation for caterpillar-induced aphid resistance in maize -
Tzin, V., Lindsay, P.L., Christensen, S.A., Meihls, L.N., Blue, L.B., Jander, G. 2015. Genetic mapping shows intraspecific variation and transgressive segregation for caterpillar-induced aphid resistance in maize. Molecular Ecology. 24(22):5739-5750.
Climate change and crop phytochemical defenses: Potential implications for food security and food safety -
Vaughan, M.M., Huffaker, A., Schmelz, E.A., Christensen, S.A., Allen, L.H., Teal, P.E. 2015. Climate change and crop phytochemical defenses: Potential implications for food security and food safety [abstract].
Maize death acids, 9-lipoxygenase-derived cyclopente(a)nones display activity as cytotoxic phytoalexins and transcriptional mediators -
Christensen, S.A., Huffaker, A., Kaplan, F., Sims, J.W., Ziemann, S., Doehlemann, G., Ji, L., Schmitz, R.J., Kolomiets, M.V., Alborn, H.T., Mori, N., Jander, G., Ni, X., Sartor, R.C., Byers, S.O., Abdo, Z., Schmelz, E.A. 2015. Maize death acids, 9-lipoxygenase-derived cyclopente(a)nones display activity as cytotoxic phytoalexins and transcriptional mediators. Proceedings of the National Academy of Sciences. 112(36):11407-11412.
The maize death acids, 10-oxo-11-phytoenoic acid and derivatives, demonstrate specificity in jasmonate-related signaling and defense -
Accumulation of terpenoid phytoalexins in maize roots is associated with drought tolerance Reprint Icon -
Vaughan, M.M., Christensen, S., Schmelz, E.A., Huffaker, A., McAuslane, H.J., Alborn, H.T., Romero, M., Allen, L.H., Teal, P.E.A. 2015. Accumulation of terpenoid phytoalexins in maize roots is associated with drought tolerance. Plant, Cell and Environment. 38:2195–2207.
Role of plant elicitor peptides and phytoalexins in enhancing maize resistance to Aspergillus flavus infection -
Isolation and structural elucidation of acidic terpenoid phytoalexins in maize and their interactions with Aspergillus flavus -
The novel monocot-specific 9-lipoxygenase, ZmLOX12 is required to mount an effective jasmonate-mediated defense against Fusarium verticillioides in maize -
Christensen, S.A., Nemchenko, A., Park, Y., Borrego, E., Huang, P., Schmelz, E.A., Kunze, S., Feussner, I., Yalpani, N., Meeley, R., Kolomiets, M.V. 2014. The novel monocot-specific 9-lipoxygenase, ZmLOX12 is required to mount an effective jasmonate-mediated defense against Fusarium verticillioides in maize. Molecular Plant-Microbe Interactions. 24(11):1263-1276.
Effects of elevated [CO2] on maize defense against mycotoxigenic Fusarium verticillioides -
Vaughan, M.M., Huffaker, A., Schmelz, E.A., Dafoe, N.J., Christensen, S.A., Sims, J.W., Martins, V.F., Swerbilow, J., Romero, M.I., Alborn, H.T., Allen, L.H., Teal, P.E. 2014. Effects of elevated [CO2] on maize defense against mycotoxigenic Fusarium verticillioides [abstract].
Effects of elevated CO2 on maize defense against mycotoxigenic Fusarium verticillioides Reprint Icon -
Vaughan, M.M., Huffaker, A., Schmelz, E.A., Dafoe, N.J., Christensen, S.A., Sims, J.W., Martins, V.F., Swerbilow, J.C., Romero, M.I., Alborn, H.T., Allen Jr, L.H., Teal, P.E. 2014. Effects of elevated CO2 on maize defense against mycotoxigenic Fusarium verticillioides. Plant Cell and Environment. doi: 10.1111/pce.12337.
Biosynthesis, elicitation and roles of monocot terpenoid phytoalexins -
Schmelz, E.A., Huffaker, A., Sims, J.W., Christensen, S.A., Lu, X., Okada, K., Peters, R. 2014. Biosynthesis, elicitation and roles of monocot terpenoid phytoalexins. Plant Journal. 79:659-678.
Two closely related members of Arabidopsis 13-LOXs, LOX3 and LOX4, reveal distinct functions in response to plantparasitic nematode infection -
Ozalvo, R., Cabrera, J., Escobar, C., Christensen, S.A., Borrego, E.J., Kolomiets, M.V., Castresana, C., Iberkleid, I., Horowitz, S.B. 2014. Two closely related members of Arabidopsis 13-LOXs, LOX3 and LOX4, reveal distinct functions in response to plantparasitic nematode infection. Molecular Plant Pathology. 15(4):319-332.
Seed treatment with live or dead Fusarium verticillioides equivalently reduces the severity of subsequent stalk rot -
Martins, V.F., Vaughan, M.M., Huffaker, A., Schmelz, E.A., Christensen, S.A., Sims, J.W., Benda, N.D., Swerbilow, J.C., Alborn, H.T., Teal, P.E. 2013. Seed treatment with live or dead Fusarium verticillioides equivalently reduces the severity of subsequent stalk rot. Journal of Phytopathology. 162(3):201-204.
Maize pathogens suppress inducible phytoalexin production to thwart innate plant immunity -
Isolation and identificaton of novel terpenoid phytoalexins in maize -
Maize kauralexins: insights into structure, function, and biosynthesis -
The maize lipoxygenase, ZmLOX10, mediates green leaf volatile, jasmonate, and herbivore-induced plant volatile production for defense against insect attack -
Christensen, S.A., Nemchenko, A., Borrego, E., Murray, I., Sobhy, I.S., Bosak, L., Deblasio, S., Matthias, E., Christelle, R., Vaughn, K.A., Herrfurth, C., Tumlinson, J., Feussner, I., Jackson, D., Turlings, T., Engelberth, J., Nansen, C., Meeley, R., Kolomiets, M.V. 2013. The maize lipoxygenase, ZmLOX10, mediates green leaf volatile, jasmonate, and herbivore-induced plant volatile production for defense against insect attack. Plant Journal. 74:59-73.