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The impact of inbreeding by plants on organic volatile production, herbivory and the establishment and spread of diseases. The effects of disease on the foraging behavior of vectors and their natural enemies.
Free-living (wild) gourds and cultivated squash and their pathosystem including cucumber beetles, aphids, bacterial wilt disease, and various mosaic viruses.
Horsenettle weeds and closely related crop species (tomato/potato/eggplant) and their pathosystems.
JE Harth, JA Winsor, DR Weakland, KJ Nowak, MJ Ferrari, ... Effects of virus infection on pollen production and pollen performance: Implications for the spread of resistance alleles. American journal of botany 103 (3), 577-583
HE Simmons, HR Prendeville, JP Dunham, MJ Ferrari, JD Earnest, ... TRansgenic virus resistance in crop-wild cucurbita pepo does not prevent vertical transmission of Zucchini yellow mosaic virus. Plant Disease 99 (11), 1616-1621
Shapiro, L.R., Scully, E.D., Roberts, D., Straub, T.J., Geib, S.M., Stephenson, A.G., Salaau Rojas, E., Liu, Q, Beattie, G., Gleason, M., De Moraes, C.M., Mescher, M.C., Fleishcer, S.G., Kolter, R., Pierce, N., Zhaxybayeva, O. Draft genome sequence of Erwinia tracheiphila, an economically important bacterial pathogen of cucurbits. Genome Announcements June 2015; 3(3). DOI:10.1128/genomeA.00482-15.
Portman, S.L., Kariyat, R.R., Johnston, M.A., Stephenson, A.G., Marden, J.H. Inbreeding compromises host plant defense gene expression and improves herbivore survival. Plant signaling & behavior 05/2015; 10(5):e998548. DOI:10.1080/15592324.2014.998548.
SL Portman, RR Kariyat, MA Johnston, AG Stephenson, JH Marden. Cascading effects of host plant inbreeding on the larval growth, muyscle mlecular composition, and flight capacity of an adult herbivorous insect. Functional Ecology 29 (3), 328-337
Nihranz, C.T.P., Stephenson, A.G. Transgenerational effect of inbreeding and herbivory on Manduca sexta caterpillar preference and performance on horsenettle (Solanum carolinense). Entomological Society of America Annual Meeting 2014; Nov 2014.
Portman, S. L., Kariyat, R.R., Johnston, M.A., Stephenson, A.G., Marden, J.H. Cascading effects of host plant inbreeding on the larval growth, muscle molecular comosition, and flight capacity of an adult herbivorous insect. Functional Ecology Oct 2014; 29(3). DOI:10.1111/1365-2435.12358.
Harth, J.E., Stephenson, A.G. Impacts of a virus resistant transgene on the establishment and spread of powdery mildew in wild squash. 99th ESA Annual Convention 2014; Aug 2014.
Dunham, J.P., Simmons, H.E., Holmes, E.C., Stephenson, A.G. Analysis of viral (zuchini yellow mosaic virus) genetic diversity during systemic movement through a Cucurbita pepo vine. Virus Research Aug 2014; 191. DOI:10.1016/j.virusres.2014.07.030.
Shapiro, L.R., Seidl-Adams, I., De Moraes, C.M., Stephenson, A.G., Mescher, M.C. Dynamics of short- and long-term association between a bacterial plant pathogen and its arthropod vector. Scientific Reports Feb 2014; 4:4155. DOI:10.1038/srep04155.
Kariyat, R.R., Scanlon, S.R., Moraski, R.P, Stephenson, A.G., Mescher, M.C., De Moraes, C.M. Plant inbreeding and prior herbivory influence the attraction of caterpillars (Manduca sexta) to odors of the host plant Solanum carolinense (Solanaceae). American Journal of Botany Feb 2014; 101(2). DOI:10.3732/ajb.1300295.
Simmons, H.E., Prendeville, H.R., Dunham, J.P., Ferrari, M.J., Earnest, J.D., Pilson, D., Munkvold, G.P., Holmes, E.C., Stephenson, A.G. Transgenic virus-resistance in Cucurbita pepo does not prevent vertical transmission of Zuchini yellow mosaic virus. Plant Disease Jan 2014; DOI:10.1094/PDIS-10-14-1062-RE.
Stephenson, A.G., Kariyat, R.R., Smith, J.D., De Moraes, C.M., Mescher, M.C. The foliar trichomes of horsenettle damage the peritrophic membrane of Manuduca sexta larvae and negatively affect their consumption and growth rates. Entomological Society of America Annual Meeting 2013; Nov 201.
Shapiro, L.R., Salvaudon, L., Mauck, K.E., Pulido, H., De Moraes,C.M., Stephenson, A.G., Mescher, M.C. Disease interactions in a shared host plant: effects of pre-existing viral infection on Cucurbit plant defense responses and resistance to bacterial wilt disease. PLoS ONE Oct 2013; 8(10):e77393. DOI:10.1371/journal.pone.0077393.
Harth, J., Ferrari, M.J., Stephenson, A.G. A multi-year comparison of the fitness of the virus resistant transgene in wild populations of Cucurbita pepo. 98th ESA Annual Convention 2013; Aug 2013.
Simmons, H.E., Dunham, J.P., Zinn, K.E., Munkvold, G.P., Holmes, E.C., Stephenson, A.G. Zucchini yellow mosaic virus (ZYMV, Potyvirus): Vertical transmission, seed infection and cryptic infections. Virus Res. 2013 Sep; 176(1-2):259-64.
Kariyat, R.R., Balogh, C.M., Moraski, R.P., De Moraes, C.M., Mescher, M.C., Stephenson, A.G. Constitutive and herbivore-induced structural defenses are compromised by inbreeding in Solanum carolinense (Solanaceae). American Journal of Botany 04/2013; 100(6). DOI:10.3732/ajb.1200612.
Kariyat, R.R., Mauck, K.E., Balogh, C.M., Stephenson, A.G., Mescher, M.C., De Moraes, C.M. Inbreeding in horsenettle (Solanum carolinense) alters night-time volatile emissions that guide oviposition by Manduca sexta moths. Proceedings of the Royal Society B: Biological Sciences 02/2013; 280(1757):20130020. DOI:10.1098/rspb.2013.0020.
Kariyat, R.R., Mauck, K.E., Balogh, C.M., Stephenson, A.G., Mescher MC, De Moraes CM. Inbreeding in horsenettle (Solanum carolinense) alters night-time volatile emissions that guide oviposition by specialist herbivores. Entomological Society of America Annual Meeting 2012; Nov 2012.
Portman, S.L., Kariyat, R.R., Johnston, M., Stephenson, A.G., Marden, J.H. Host plant (Solanum carolinense L.) inbreeding affects larval growth, adult flight metabolism, and gene expression of a specialist herbivore (Manduca sexta L.) Entomological Society of America Annual Meeting 2012; Nov 2012.
Shapiro, L., C.M. De Moraes, A.G. Stephenson and M.C. Mescher. (2012). Pathogen effects on vegetative and floral odors mediate vector attraction and host exposure in a complex pathosystem. Ecology Letters 15:1430-1438 doi: 10.1111/ele.12001.
Simmons, H.E., J. Dunham, J. Stack, B. Dickins, I. Pagan, E.C. Holmes and A.G. Stephenson. (2012). Deep sequencing reveals persistence of intra- and inter-host genetic diversity in natural and greenhouse populations of Zucchini yellow mosaic virus. Journal of General Virology 93:1831-1840.
Kariyat R.R., De Moraes CM, Stephenson AG, Mescher MC. (2012). Inbreeding increases susceptibility to powdery mildew, Oidium neolycopersici, infestation in horsenettle (Solanum carolinense L.). Plant Signaling and Behavior 7:803-806.
Simmons, H. E., Holmes, E. C., Gildow, F. E., Bothe-Goralczyk, M. A., & Stephenson, A. G. (2011). Experimental verification of seed transmission in zucchini yellow mosaic virus. Plant Disease.
Sasu, M.A., Wall, K. L., & Stephenson, A.G. (2010). Antimicrobial nectar inhibits a floral transmitted pathogen of a wild Cucurbita pepo (Cucurbitaceae). American Journal of Botany, 97, 1025-1030.
Sasu, M. A., Seidl-Adams, I., Wall, K., Winsor, J. A., & Stephenson, A. G. (2010). Floral transmission of Erwinia tracheiphila by cucumber beetles in a wild Cucurbita pepo. Environmental Entomology, 39, 140-148.
Sasu, M.A., Ferrari, M. J., Du, D., Winsor, J. A., & Stephenson, A. G. (2009). Indirect costs of a non-target pathogen mitigate the direct benefits of a virus resistant transgene in wild Cucubita. Proceedings of the National Academy of Science (USA). 106,19067-19071.